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Joint Committee on Infant Hearing
Year 2000 Position Statement: Principles and Guidelines for Early
Hearing Detection and Intervention Programs
The Year 2000 Position Statement and Guidelines were developed by
the Joint Committee on Infant Hearing (JCIH). Joint committee member
organizations and their respective representatives who prepared this
statement include (in alphabetical order) the American Academy of
Audiology (Terese Finitzo, PhD, chair; and Yvonne Sininger, PhD); the
American Academy of Otolaryngology–Head and Neck Surgery (Patrick
Brookhouser, MD, vice-chair; and Stephen Epstein, MD); the American
Academy of Pediatrics (Allen Erenberg, MD; and Nancy Roizen, MD); the
American Speech-Language-Hearing Association (Allan O. Diefendorf, PhD;
Judith S. Gravel, PhD; and Richard C. Folsom, PhD); the Council on
Education of the Deaf whose member organizations include Alexander Graham
Bell Association for the Deaf and Hard of Hearing, American Society for
Deaf Children, Conference of Educational Administrators of Schools and
Programs for the Deaf, Convention of American Instructors of the Deaf,
National Association of the Deaf, and Association of College Educators of
the Deaf and Hard of Hearing (Patrick Stone, EdD; Joseph J. Innes, PhD;
and Donna M. Dickman, PhD*); and the Directors of Speech and Hearing
Programs in State Health and Welfare Agencies (Lorraine Michel, PhD.;
Linda Rose, MCD; and Thomas Mahoney, PhD). Ex officios to the JCIH include
Evelyn Cherow, MA (American Speech-Language Hearing Association); Deborah
Hayes, PhD (Marion Downs National Center for Infant Hearing); and Liz
Osterhus, MA, and Thomas Tonniges, MD (American Academy of Pediatrics).
Joint committee member organizations that adopt this statement
include (in alphabetical order) the American Academy of Audiology, the
American Academy of Pediatrics, the American Speech-Language-Hearing
Association (LC 7-2000), the Council on Education of the Deaf (see above
individual organizations), and the Directors of Speech and Hearing
Programs in State Health and Welfare Agencies.
*Donna Dickman, deceased.
Table of Contents
The Position Statement
I. Background
II. Principles
III. Guidelines for Early Hearing Detection and Intervention Programs
A. Roles and Responsibilities
1. Institutions and
Agencies
2. Families and
Professionals
B. Hearing Screening (Principles 1 and 8)
1. Personnel
2. Program Protocol
Development
3. Screening
Technologies
4. Screening
Protocols
5. Benchmarks and
Quality Indicators for Birth Admission Hearing Screening
C. Confirmation of Hearing Loss Referred From
UNHS (Principles 2 and 8)
1. Audiologic
Evaluation
2. Medical Evaluation
a.
Pediatrician or Primary Care Physician
b.
Otolaryngologist
c.
Other medical specialists
3. Benchmarks and
Quality Indicators for Confirmation of Hearing Loss
D. Early Intervention (Principles 3 and 8)
1. Early Intervention
Program Development
2. Audiologic
Habilitation
3. Medical and Surgical
Intervention
4. Communication
Assessment and Intervention
5. Benchmarks and
Quality Indicators for Early Intervention Programs
E. Continued Surveillance of Infants and
Toddlers (Principle 4)
1. Modification of the
JCIH 1994 Risk Indicators
2. Risk indicators for
use with neonates or infants
F. Protection of Infants' and Families' Rights
(Principles 5 and 6)
G. Information Infrastructure (Principles 7 and
8) IV. Future Directions
References
The Position Statement
The Joint Committee on Infant Hearing (JCIH) endorses early detection
of, and intervention for infants with hearing loss (early hearing
detection and intervention, EHDI) through integrated, interdisciplinary
state and national systems of universal newborn hearing screening,
evaluation, and family-centered intervention. The goal of EHDI is to
maximize linguistic and communicative competence and literacy development
for children who are hard of hearing or deaf. Without appropriate
opportunities to learn language, children who are hard of hearing or deaf
will fall behind their hearing peers in language, cognition, and
social-emotional development. Such delays may result in lower educational
and employment levels in adulthood (Gallaudet University Center for
Assessment and Demographic Study, 1998). Thus, all infants' hearing should
be screened using objective, physiologic measures in order to identify
those with congenital or neonatal onset hearing loss. Audiologic
evaluation and medical evaluations should be in progress before 3 months
of age. Infants with confirmed hearing loss should receive intervention
before 6 months of age from health care and education professionals with
expertise in hearing loss and deafness in infants and young children.
Regardless of prior hearing screening outcomes, all infants who
demonstrate risk indicators for delayed onset or progressive hearing loss
should receive ongoing audiologic and medical monitoring for 3 years and
at appropriate intervals thereafter to ensure prompt identification and
intervention (American Speech-Language-Hearing Association, 1997). EHDI
systems should guarantee seamless transitions for infants and their
families through this process.
Appropriate early intervention programs are family-centered,
interdisciplinary, culturally competent, and build on informed choice for
families (Baker-Hawkins & Easterbrooks, 1994). To achieve informed
decision making, families should have access to professional, educational,
and consumer organizations, and they should have opportunities to interact
with adults and children who are hard of hearing and deaf (Ogden, 1996;
Thompson, 1994). Families should have access to general information on
child development and specific information on hearing loss and language
development. To achieve accountability, individual community and state,
health and educational programs should assume the responsibility for
coordinated, ongoing measurement and improvement of EHDI process outcomes.
I. Background
Hearing loss in newborns and infants is not readily detectable by
routine clinical procedures (behavioral observation), although parents
often report the suspicion of hearing loss, inattention, or erratic
response to sound before hearing loss is confirmed (Arehart,
Yoshinaga-Itano, Thomson, Gabbard, & Stredler Brown, 1998; Harrison
& Roush, 1996; Kile, 1993). The average age of identification in the
United States is being reduced with EHDI programs; until very recently, it
had been 30 months of age (Harrison & Roush, 1996). Although children
who have severe to profound hearing loss or multiple disabilities may be
identified before 30 months, children with mild-to-moderate losses often
are not identified until school age because of the nature of hearing loss
and the resultant inconsistent response to sound (Elssmann, Matkin, &
Sabo, 1987). For this reason, the National Institute on Deafness and Other
Communication Disorders (of the National Institutes of Health) released a
Consensus Statement on Early Identification of Hearing Impairment in
Infants and Young Children in 1993. The statement concluded that all
infants admitted to the neonatal intensive care unit (NICU) should be
screened for hearing loss before hospital discharge and that universal
screening should be implemented for all infants within the first 3 months
of life (NIDCD, 1993). In its 1994 Position Statement, the JCIH endorsed
the goal of universal detection of infants with hearing loss and
encouraged continuing research and development to improve methodologies
for identification of and intervention for hearing loss (Joint Committee
on Infant Hearing, 1994a, 1994b, 1995a, 1995b).
In the ensuing years, considerable data have been reported that support
not only the feasibility of universal newborn hearing screening (UNHS) but
also the benefits of early intervention for infants with hearing loss
(Moeller, in press). Specifically, infants who are hard of hearing and
deaf who receive intervention before 6 months of age maintain language
development commensurate with their cognitive abilities through the age of
5 years (Yoshinaga-Itano, 1995; Yoshinaga-Itano, Sedey, Coulter, &
Mehl, 1998). Numerous investigators have documented the validity,
reliability, and effectiveness of early detection of infants who are hard
of hearing and deaf through universal newborn hearing screening (Finitzo,
Albright, & O'Neal, 1998; Prieve and Stevens, 2000; Spivak, 1998;
Spivak et al., 2000; Vohr, Carty, Moore, & Letourneau, 1998; Vohr
& Maxon, 1996). Cost-effective screening is being undertaken in
individual hospitals and in numerous statewide programs in the United
States (Arehart, Yoshinaga-Itano, Thomson, Gabbard, & Stredler Brown,
1998; Finitzo, Albright, & O'Neal, 1998; Mason & Hermann, 1998;
Mehl & Thomson, 1998; Vohr, Carty, Moore, & Letourneau, 1998). As
of Spring 2000, more than half of the States have enacted legislation
supporting universal newborn hearing screening. Working groups convened by
the National Institute on Deafness and Other Communication Disorders
(NIDCD) in 1997 and 1998 offered recommendations on Acceptable Protocols
for Use in State-Wide Universal Newborn Hearing Screening Programs and
Characterization of Auditory Performance and Intervention Strategies
Following Neonatal Screening (NIDCD, 1997, 1998). Given these findings and
empirical evidence to date, the JCIH considers that accepted public health
criteria have been met to justify implementation of universal newborn
hearing screening (American Academy of Pediatrics, 1999a,b; American
Speech-Language-Hearing Association, 1989; Spivak, 1998). The JCIH issues
the year 2000 Position Statement, describes principles underlying
effective EHDI programs, and provides an accompanying guideline on
implementing and maintaining a successful EHDI program.
II. Principles
The Joint Committee on Infant Hearing (JCIH) endorses the development
of family-centered, community-based EHDI systems. EHDI systems are
comprehensive, coordinated, timely, and available to all infants. The
following eight principles provide the foundation for effective EHDI
systems. Each of the principles is discussed in the Guideline, which
follows the delineation of the principles.
1. All infants have access to hearing screening using a
physiologic measure. Newborns who receive routine care have access to
hearing screening during their hospital birth admission. Newborns in
alternative birthing facilities, including home births, have access to and
are referred for screening before 1 month of age. All newborns or infants
who require neonatal intensive care receive hearing screening before
discharge from the hospital. These components constitute universal newborn
hearing screening (UNHS).
2. All infants who do not pass the birth admission screen and any
subsequent rescreening begin appropriate audiologic and medical
evaluations to confirm the presence of hearing loss before 3 months of
age.
3. All infants with confirmed permanent hearing loss receive
services before 6 months of age in interdisciplinary intervention programs
that recognize and build on strengths, informed choice, traditions, and
cultural beliefs of the family.
4. All infants who pass newborn hearing screening but who have
risk indicators for other auditory disorders and/or speech and language
delay receive ongoing audiologic and medical surveillance and monitoring
for communication development. Infants with indicators associated with
late-onset, progressive, or fluctuating hearing loss as well as auditory
neural conduction disorders and/or brainstem auditory pathway dysfunction
should be monitored.
5. Infant and family rights are guaranteed through informed
choice, decision-making, and consent.
6. Infant hearing screening and evaluation results are afforded
the same protection as all other health care and educational information.
As new standards for privacy and confidentiality are proposed, they must
balance the needs of society and the rights of the infant and family,
without compromising the ability of health and education to provide care
(AAP, 1999).
7. Information systems are used to measure and report the
effectiveness of EHDI services. Although state registries measure and
track screening, evaluation, and intervention outcomes for infants and
their families, efforts should be made to honor a family's privacy by
removing identifying information wherever possible. Aggregate state and
national data may also be used to measure and track the impact of EHDI
programs on public health and education while maintaining the
confidentiality of individual infant and family information.
8. EHDI programs provide data to monitor quality, demonstrate
compliance with legislation and regulations, determine fiscal
accountability and cost effectiveness, support reimbursement for services,
and mobilize and maintain community support.
III. Guidelines for Early Hearing Detection and Intervention
Programs
These Guidelines are developed to supplement the eight JCIH Year 2000
Position Statement Principles and to support the goals of universal access
to hearing screening, evaluation, and intervention for newborns and
infants embodied in Healthy People 2000 (U.S. Department of Health and
Human Services Public Health Service, 1990) and 2010 (U.S. Department of
Health and Human Services, 2000). The Guidelines provide current
information on the development and implementation of successful EHDI
systems.
Hearing screening should identify infants at risk for specifically
defined hearing loss that interferes with development. On the basis of
investigations of long-term, developmental consequences of hearing loss in
infants, current limitations of physiologic screening techniques,
availability of effective intervention, and in concert with established
principles of health screening (American Academy of Pediatrics, 1999b;
Fletcher, Fletcher, & Wagner, 1988; Sackett, Haynes, & Tugwell,
1991), the JCIH defines the targeted hearing loss for UNHS programs as
permanent bilateral or unilateral, sensory or conductive hearing loss,
averaging 30 to 40 dB or more in the frequency region important for speech
recognition (approximately 500 through 4000 Hz). The JCIH recommends that
all infants with the targeted hearing loss be identified so that
appropriate intervention and monitoring may be initiated.
Hearing loss as defined above has effects on communication, cognition,
behavior, social-emotional development, and academic outcomes and later
vocational opportunities (Karchmer & Allen, 1999). These effects have
been well documented by large-scale research investigations in children
with (a) mild-to-profound bilateral hearing loss (Bess & McConnell,
1981; Blair, Peterson, & Vieweg, 1985; Carney & Moeller, 1998;
Davis, Elfenbein, Schum, & Bentler, 1986; Davis, Shepard,
Stelmachowicz, & Gorga, 1981; Karchmer & Allen, 1999), (b)
moderate-to-profound unilateral sensorineural hearing loss (Bess &
Tharpe, 1984, 1986; Oyler, Oyler, & Matkin, 1988), and (c) minimal
flat or sloping sensory hearing loss (Bess, Dodd-Murphy, & Parker,
1998). The incidence and/or prevalence of these types of hearing loss have
also been described (Bess, Dodd-Murphy, & Parker, 1998; Dalzell et
al., 2000; Finitzo, Albright, & O'Neal, 1998; Mehl & Thomson,
1998). For children with mild-to-profound bilateral sensory hearing loss,
effective habilitation strategies including use of personal amplification,
language development programs, and speech training have been described
(Goldberg & Flexer, 1993; Stelmacho-wicz, 1999; Yoshinaga-Itano,
Sedey, Coulter, & Mehl, 1998).
Depending on the screening technology selected, infants with hearing
loss less than 30 dB HL or with hearing loss related to auditory
neuropathy or neural conduction disorders may not be detected in a
universal newborn hearing screening program. Although the JCIH recognizes
that these disorders may result in developmental delay, limitations of
some currently recommended screening technologies preclude cost-effective
detection of these disorders. All infants, regardless of newborn hearing
screening outcome, should receive ongoing monitoring for development of
age-appropriate auditory behaviors and communication skills. Any infant
who demonstrates delayed auditory and/or communication skills development
should receive audiologic evaluation to rule out hearing loss.
The JCIH supports applying the concepts of continual process or quality
improvement to each component of EHDI programs to achieve desired
outcomes. The JCIH recommends that systems be designed to achieve quality
outcomes for infants and their families and for hospital, state, and
national programs. Specifically, at each step in the process of care,
performance measures should be undertaken to examine whether the system
conforms to accepted standards of quality (Finitzo, 1999; Tharpe &
Clayton, 1997). This guideline outlines the benchmarks and associated
quality indicators that serve to monitor compliance and outcomes at each
step in the EHDI process.
Benchmarks are quantifiable goals or targets by which an EHDI program
may be monitored and evaluated. Benchmarks are used to evaluate progress
and to point to needed next steps in achieving and maintaining a quality
EHDI program (O'Donnell & Galinsky, 1998). Because EHDI programs are
relatively new, the JCIH has included examples of established benchmarks
that are based on existing data and suggested benchmarks in areas where
published data are not currently available. Quality indicators reflect a
result in relation to a stated benchmark. Quality indicators should be
monitored using well-established practices of statistical process control
to determine program consistency and stability (Wheeler & Chambers,
1986). If the quality indicators demonstrate that a program is not meeting
the stated benchmark, sources of variability should be identified and
corrected to improve the process (Tharpe & Clayton, 1997). It is
prudent for hospitals and state programs to establish a periodic review
process to evaluate benchmarks as more data on EHDI outcomes become
available and to examine how program quality indicators are conforming to
established benchmarks.
A. Roles and Responsibilities
1. Institutions and Agencies. A variety of public and private
institutions and agencies may assume responsibility for specific
components (e.g., screening, evaluation, intervention) of a comprehensive
EHDI program and the training required for EHDI success. State and local
agencies that are involved in components of an EHDI program should work
collaboratively to define their roles, responsibilities, and
accountability. These roles and responsibilities may differ from state to
state; however, it is strongly recommended that each state identify a lead
coordinating agency with oversight responsibility for EHDI. The lead
coordinating agency should convene an advisory committee consisting of
professionals, families with children who are hard of hearing or deaf,
members of the hard of hearing and Deaf communities, and other interested
community leaders to provide guidance on the development, coordination,
funding, and quality evaluation of community-based EHDI programs (ASHA,
AAA, & AG Bell, 1997; Model Universal Newborn/Infant Hearing
Screening, Tracking, and Intervention Bill). The lead coordinating agency
in each state should be responsible for identifying the public and private
funding sources available to support development, implementation, and
coordination of EHDI systems. Funding sources may vary from year to year.
Currently, federal sources of systems support include Title V block grants
to states for maternal and child health care services, Title XIX
(Medicaid) federal and state funds for eligible children, and competitive
U.S. Department of Education demonstration and research grants. The
National Institute on Deafness and Other Communication Disorders provides
grants for research related to early identification and intervention for
children who are hard of hearing and deaf. Sources of reimbursement for
services to individual children will vary from state to state and may
include private medical insurance coverage.
2. Families and Professionals. The success of EHDI programs
depends on professionals working in partnership with families as a
well-coordinated team (Moeller, in press). The roles and responsibilities
of each team member should be well defined and clearly understood.
Essential team members are families, pediatricians or primary care
physicians, audiologists, otolaryngologists, speech-language pathologists,
educators of children who are hard of hearing or deaf, and other early
intervention professionals involved in delivering EHDI services (Joint
Committee of ASHA and Council on Education of the Deaf, 1994). Provisions
for supportive family education, counseling, and guidance should be
available (Calderon, Bargones, & Sidman, 1998).
Pediatricians and other primary care physicians, working in partnership
with parents and other health-care professionals, make up the infant's
"medical home." A medical home is defined as an approach to providing
health care services where care is accessible, family-centered,
continuous, comprehensive, coordinated, compassionate, and culturally
competent. Pediatricians act in partnership with parents in a medical home
to identify and access services needed in developing a global plan of
appropriate and necessary health and habilitative care for infants
identified with hearing loss. The infant's pediatrician or other primary
care physician functions as the advocate for the whole child within the
context of the medical home (American Academy of Pediatrics, 1992,
1993).
As experts in identification, evaluation, and auditory habilitation of
infants who are hard of hearing and deaf, audiologists are involved in
each component of the EHDI process. For the hearing screening component,
audiologists provide program development, management, quality assessment,
service coordination, and effective transition to evaluation,
habilitative, and intervention services. For the follow-up component,
audiologists provide comprehensive audiologic assessment to confirm the
existence of the hearing loss, evaluate the infant for candidacy for
amplification and other sensory devices and assistive technology, and
ensure prompt referral to early intervention programs. For the early
intervention component, audiologists provide timely fitting and monitoring
of amplification (sensory devices and assistive technology) with family
consent, family education, counseling, and ongoing participation in the
infant's service plan (Pediatric Working Group of the Conference on
Amplification for Children with Auditory Deficits, 1996). In addition,
audiologists provide direct auditory habilitation services to infants and
families. Audiologists participate in the assessment of candidacy for
cochlear implantation.
Otolaryngologists are physicians whose specialty includes the
identification, evaluation, and treatment of ear diseases and syndromes
related to hearing loss. Families consult an otolaryngologist to determine
the etiology of the hearing loss, the presence of related syndromes
involving the head and neck structures, and related risk indicators
(Section III. E below) for hearing loss. An otolaryngologist with
expertise in childhood hearing loss can determine whether medical and/or
surgical intervention may be appropriate. When medical and/or surgical
intervention is provided, the otolaryngologist is involved in the
long-term monitoring and follow-up within the infant's medical home. The
otolaryngologist also provides information and participates in the
assessment for candidacy for amplification, assistive devices, and
cochlear implantation.
Early intervention professionals provide comprehensive family-centered
services. They are professionals trained in a variety of academic
disciplines, such as speech-language pathology, audiology, education of
children who are hard of hearing and deaf, service coordination, or early
childhood special education. All individuals who provide services to
infants with hearing loss should have training and expertise in auditory,
speech, and language development; communication approaches for infants
with hearing loss and their families (e.g., cued speech, sign language
systems including American Sign Language); and child development (Ross,
1990; Stredler-Brown, 1999). Speech-language pathologists provide both
evaluation and treatment for language, speech, and cognitive-communication
development (ASHA, 1989). Educators of children who are hard of hearing
and deaf integrate the development of communicative competence within the
infant's entire development, including a variety of social, linguistic,
and cognitive/academic contexts (Joint Committee of ASHA & CED, 1994).
In collaboration with the family and other EHDI team members, the service
coordinator (case manager) facilitates the family's transition from
screening to evaluation to early intervention; links the family to the
local Part C system (Public Law 105-17: the amendments to the Individuals
with Disabilities Education Act, IDEA, 1997; U.S. Department of Education,
Office of Special Education and Rehabilitative Services, 1998); monitors
the timeliness of the services; and provides information regarding program
options, funding sources, communication choices, and emotional support.
This professional incorporates the family's preferences for outcomes into
an individualized family service plan (IFSP) as required by federal
legislation (IDEA, as defined above). The service coordinator supports the
family in stimulation of the infant's communicative development; monitors
the infant's progress in language, motor, cognitive and social-emotional
development in the IFSP review; and assists the family in advocating for
its infant's unique developmental needs.
B. Hearing Screening (Principles 1 and 8)
1. Personnel. Teams of professionals, including audiologists,
physicians (neonatologists, pediatricians, other primary care physicians,
and otolaryngologists), and nursing personnel, should be involved in
establishing the UNHS component of EHDI programs. Hospitals and agencies
should designate a physician to oversee the medical aspects of the EHDI
program. Audiologists should be designated as the program manager with
supervisory responsibilities for the hearing screening and audiologic
aspects of the EHDI program and should be involved in the design,
implementation, and evaluation of screening programs (including those of
small and rural hospitals) (Joint Committee on Infant Hearing, 1994a,b).
In addition to audiologists, personnel who carry out the screening
procedure may include nurses, speech-language pathologists, and others who
are trained by the audiologist (American Academy of Audiology, 1998;
American Speech-Language-Hearing Association, 1997; National Institute on
Deafness and Other Communication Disorders, 1993, 1997; White & Maxon,
1999).
2. Program Protocol Development. Each team of professionals
responsible for the hospital-based UNHS program needs to undertake a
comprehensive review of the current hospital infrastructure before
implementation of screening. The development of a hospital-based screening
program should consider technology, screening protocols including the
timing of the screening relative to nursery discharge, availability of
qualified screening personnel, acoustically appropriate environments,
follow-up referral criteria, information management, and quality control.
Reporting and communication management must all be defined. These include
the content of reports to physicians and parents, documentation of results
in medical records, and methods for reporting to state registries and
national data sets. Methods for ensuring that communications to parents
are confidential and sensitive should be well defined. Health
communication specialists should work with EHDI stakeholders to develop
and disseminate family information materials that are accessible and
represent the range of alternatives. Materials should be produced in
languages other than English for diverse cultures and for low-literacy
consumers. Quality indicators and outcome measurements for each component
of the UNHS program should be identified and defined before implementation
of screening to monitor compliance with program benchmarks. Solutions to
problems are often found at the local level. Community resources should be
accessed to achieve successful implementation of UNHS.
3. Screening Technologies. Objective physiologic measures must
be employed to detect newborns and very young infants with the targeted
hearing loss. Current physiologic measures used for detecting unilateral
or bilateral hearing loss of various severities include otoacoustic
emissions (OAEs), either transient-evoked (TEOAE) or distortion-product
(DPOAE), and/or auditory brainstem response (ABR). Both OAE and ABR
technologies have been successfully implemented for universal newborn
hearing screening (Finitzo, Albright, & O'Neal, 1998; Mason &
Hermann, 1998; Vohr, Carty, Moore, & Letourneau, 1998). Both
technologies are noninvasive recordings of physiologic activity that
underlie normal auditory function and that are easily recorded in
neonates. Both OAE and ABR measures are highly correlated with the degree
of peripheral hearing sensitivity.
OAEs are sensitive to outer hair cell dysfunction. The technology can
be used to detect sensory (i.e., inner ear) hearing loss (Gorga et al.,
1993; Prieve et al., 1993). OAEs can be reliably recorded in neonates in
response to stimuli in the frequency range above 1500 Hz. The OAE is known
to be sensitive to outer ear canal obstruction and middle ear effusion,
and, therefore, temporary conductive dysfunction can cause a positive test
result (a "refer" outcome) in the presence of normal cochlear function
(Doyle, Burggraaff, Fujikawa, Kim, & MacArthur, 1997). Because OAE
responses are generated within the cochlea by the outer hair cells, OAE
evaluation does not detect neural (i.e., eighth nerve or auditory
brainstem pathway) dysfunction. Infants with auditory neuropathy or neural
conduction disorders without concomitant sensory (i.e., outer hair cell)
dysfunction will not be detected by OAEs.
The ABR reflects activity of the cochlea, auditory nerve, and auditory
brainstem pathways. When used as a threshold measure, the click-evoked ABR
is highly correlated with hearing sensitivity in the frequency range from
1000 to 8000 Hz (Gorga et al., 1993; Hyde, Riko, & Malizia, 1990). The
ABR is sensitive to auditory nerve and brainstem dysfunction; therefore,
ABR screening may result in a positive test (a "refer" outcome) in the
absence of peripheral (e.g., middle ear or cochlear) hearing loss. Because
the ABR is generated by auditory neural pathways, the ABR will detect
auditory neuropathy or neural conduction disorders in newborns.
Development of a program includes the establishment of the interpretive
criteria for pass and refer. Interpretive criteria should be founded on a
clear scientific rationale. Such rationale may be based in statistics and
signal detection theory or heuristic and empirically derived. Test
performance efficiency, including sensitivity, specificity, and the
positive and negative predictive values, should be evidenced-based (Hyde,
Davidson, & Alberti, 1991; Hyde, Sininger, & Don, 1998). Screening
technologies that incorporate automated response detection are preferred
over those that require operator interpretation and decision making.
Automated algorithms eliminate the need for individual test
interpretation, reduce the effects of screener bias and errors on test
outcome, and ensure test consistency across all infants, test conditions,
and screening personnel (Eilers, Miskiel, Ozdamar, Urbano, & Widen,
1991; Herrmann, Thornton, & Joseph, 1995; McFarland, Simmons, &
Jones, 1980; Ozdamar, Delgado, Eilers, & Urbano, 1994; Pool &
Finitzo, 1989). Programs that use trained and supervised nonprofessional
staff must use technologies that provide automated pass-refer criteria.
Before incorporating automated response detection algorithms, however, the
screening program must ensure that the algorithms have been validated by
rigorous scientific methods and that those results have been reported in
peer-reviewed publications.
Some infants with hearing loss will pass the newborn hearing screening.
Both ABR and OAE technology can show false-negative findings, depending on
whether hearing loss exists in configurations that include normal hearing
for one or more frequencies in the target range. These would include
isolated low-frequency (i.e., below 1000 Hz) hearing loss or steeply
sloping high-frequency (i.e., above 2000 Hz) hearing loss. ABR can show
false-negative findings with midfrequency hearing loss (i.e., 500-2000
Hz). Additional variables that influence screening test performance
include the population (age and presence of risk indicators), the targeted
hearing loss, the performance and recording characteristics of the test
technology, the pass-refer criteria, and excessive retesting using the
same technology (which increases the likelihood of a false-negative
screening outcome).
4. Screening Protocols. A variety of hospital-based UNHS
screening protocols have been successfully implemented that permit all
newborns access to hearing screening during their birth admission
(Arehart, Yoshinaga-Itano, Thomson, V., Gabbard, & Stredler Brown,
1998; Finitzo, Albright, & O'Neal, 1998; Gravel et al., 2000; Mason
& Hermann, 1998; Mehl & Thomson, 1998; Vohr, Carty, Moore, &
Letourneau, 1998). Most infants pass their initial screening test. Many
inpatient-screening protocols provide one or more repeat screens, using
the same or a different technology, if the newborn does not pass the
initial birth screen. For example, hospitals may screen with OAE
technology or ABR technology and retest infants who "refer" with the same
or the other technology.
Some screening protocols incorporate an outpatient rescreening of
infants who do not pass the birth admission screening within 1 month of
hospital discharge. The mechanism of rescreening an infant minimizes the
number of false-positive referrals for follow-up audiologic and medical
evaluation. Outpatient screening by 1 month of age should also be
available to infants who were discharged before receiving the birth
admission screening or who were born outside a hospital or birthing
center.
5. Benchmarks and Quality Indicators for Birth Admission Hearing
Screening.
(a) Recommended UNHS benchmarks include the following:
(1) Within 6 months of program initiation, hospitals or birthing
centers screen a minimum of 95% of infants during their birth admission or
before 1 month of age. Programs can achieve and maintain this outcome
despite birth admissions of 24 or fewer hours (Finitzo, Albright, &
O'Neal, 1998; Mason & Hermann, 1998; Spivak et al., 2000; Vohr, Carty,
Moore, & Letourneau, 1998).
(2) The referral rate for audiologic and medical evaluation following
the screening process (in-hospital during birth admission or during both
birth admission and outpatient follow-up screening) should be 4% or less
within 1 year of program initiation.
(3) The agency within the EHDI program with defined responsibility for
follow-up (often a state department of health) documents efforts to obtain
follow-up on a minimum of 95% of infants who do not pass the hearing
screening. Ideally, a program should achieve a return-for-follow-up of 70%
of infants or more (Prieve et al., 2000). Successful follow-up is
influenced by such factors as lack of adequate tracking information,
changes in the names or addresses of mother and/or infant, absence of a
designated medical home for the infant, and lack of health insurance that
covers follow-up services.
(b) Associated quality indicators of the screening component of EHDI
programs may include the following:
(1) Percentage of infants screened during the birth admission.
(2) Percentage of infants screened before 1 month of age.
(3) Percentage of infants who do not pass the birth admission
screen.
(4) Percentage of infants who do not pass the birth admission screening
who return for follow-up services (either outpatient screening and/or
audiologic and medical evaluation).
(5) Percentage of infants who do not pass the birth
admission/outpatient screen(s) who are referred for audiologic and medical
evaluation.
(6) Percentage of families who refuse hearing screening on birth
admission.
Quality indicators for hospital-based programs should be monitored
monthly to ascertain whether a program is achieving expected benchmarks
and outcomes (targets and goals). Frequent measures of quality permit
prompt recognition and correction of any unstable component of the
screening process (Agency for Healthcare Policy and Research, 1995).
Focused reeducation for staff can be undertaken in a timely manner to
address strategies to achieve targets and goals.
C. Confirmation of Hearing Loss in Infants Referred From UNHS
(Principles 2 and 8)
Infants who meet the defined criteria for referral should receive
follow-up audiologic and medical evaluations before 3 months of age. The
infant should be referred for comprehensive audiologic assessment and
specialty medical evaluations to confirm the presence of hearing loss and
to determine type, nature, options for treatment, and (whenever possible)
etiology of the hearing loss. After a hearing loss is confirmed,
coordination of services should be expedited by the infant's medical home
and Individuals with Disabilities Education Act (IDEA) Part C coordinating
agencies. Part C agencies are responsible for Child Find and intervention
for children with disabilities and the related professionals with
expertise in hearing loss evaluation and treatment. The infant's primary
care physician, with guidance or coordination from state and local
agencies, should address parental concerns and mobilize systems on behalf
of the infant and family. Professionals in health care and education must
interface to provide families with needed services for the infant with
hearing loss.
1. Audiologic Evaluation. Audiologists providing the initial
audiologic test battery to confirm the existence of a hearing loss in
infants must include physiologic measures and developmentally appropriate
behavioral techniques. Adequate confirmation of an infant's hearing status
cannot be obtained from a single test measure. Rather, a test battery is
required to cross-check results of both behavioral and physiologic
measures (Jerger & Hayes, 1976). The purpose of the audiologic test
battery is to assess the integrity of the auditory system, to estimate
hearing sensitivity, and to identify all intervention options. Regardless
of the infant's age, ear-specific estimates of type, degree, and
configuration of hearing loss should be obtained.
For infants birth to 6 months of age, the test battery should begin
with a child and family history and must include an electrophysiologic
measure of threshold such as ABR (Sininger, Abdala, & Cone-Wesson,
1997; Stapells, Gravel, & Martin, 1995) or other appropriate
electrophysiologic tests (Rance, Rickards, Cohen, DeVidi, & Clark,
1995) using frequency-specific stimuli. The assessment of the young infant
must include OAEs (Prieve, Fitzgerald, Schulte, & Demp, 1997), a
measure of middle ear function, acoustic reflex thresholds, observation of
the infant's behavioral response to sound, and parental report of emerging
communication and auditory behaviors. Appropriate measures of middle ear
function for this age group include reflectance (Keefe & Levi, 1996),
tympanometry using appropriate frequency probe stimuli (Marchant et al.,
1986), bone conduction ABR (Cone-Wesson & Ramirez, 1997), and/or
pneumatic otoscopy.
The confirmatory audiologic test battery for infants and toddlers age 6
through 36 months includes a child and family history, behavioral response
audiometry (either visual reinforcement or conditioned play audiometry
depending on the child's developmental age), OAEs, acoustic immittance
measures (including acoustic reflex thresholds), speech detection and
recognition measures (Diefendorf & Gravel, 1996; Gravel & Hood,
1999), parental report of auditory and visual behaviors, and a screening
of the infant's communication milestones. Physiologic tests, such as ABR,
should be performed at least during the initial evaluation to confirm
type, degree, and configuration of hearing loss.
In accordance with IDEA, referral to a public agency must take place
within 2 working days after the infant has been identified as needing
evaluation. Once the public agency receives the referral, its role is to
appoint a service coordinator, identify an audiologist to complete the
audiologic evaluation, and identify other qualified personnel to determine
the child's level of functioning. An IFSP must be held within 45 days of
receiving the referral (Public Law 105-17: the amendments to the
Individuals with Disabilities Education Act, IDEA 1997; U.S. Department of
Education, Office of Special Education and Rehabilitative Services, 1998).
2. Medical Evaluation. Every infant with confirmed hearing loss
and/or middle ear dysfunction should be referred for otologic and other
medical evaluation. The purpose of these evaluations is to determine the
etiology of hearing loss, to identify related physical conditions, and to
provide recommendations for medical treatment as well as referral for
other services. Essential components of the medical evaluation include
clinical history, family history, and physical examination as well as
indicated laboratory and radiologic studies. When indicated and with
family consent, the otolaryngologist may consult with a geneticist for
chromosome analysis and for evaluation of specific syndromes related to
hearing loss.
(a) Pediatrician or primary care physician: The infant's pediatrician
or other primary care physician is responsible for monitoring the general
health and well-being of the infant. In addition, the primary care
physician in partnership with the family and other health care
professionals, assures that audiologic assessment is conducted on infants
who do not pass screening and initiates referrals for medical specialty
evaluations necessary to determine the etiology of the hearing loss.
Middle-ear status should be monitored because the presence of middle-ear
effusion can further compromise hearing. The pediatrician or primary care
physician should review the infant's history for presence of risk
indicators that require monitoring for delayed onset and/or progressive
hearing loss and should insure periodic audiologic evaluation for children
at risk. Also, because 30% to 40% of children with confirmed hearing loss
will demonstrate developmental delays or other disabilities, the primary
care physician should monitor developmental milestones and initiate
referrals related to suspected disabilities (Karchmer & Allen,
1999).
(b) Otolaryngologist: The otolaryngologist's evaluation should consist
of a comprehensive clinical history; family history; physical assessment,
and laboratory tests involving the ears, head, face, neck, and such other
systems as skin (pigmentation), eye, heart, kidney, and thyroid that could
be affected by childhood hearing loss (Tomaski & Grundfast, 1999). The
physical examination of the ear involves identification of external ear
malformations including preauricular tags and sinuses, abnormalities or
obstruction of ear canals such as the presence of excessive cerumen, and
abnormalities of the tympanic membrane and/or middle ear, including otitis
media with effusion. Supplementary evaluations may include imaging studies
of the temporal bones and electrocardiograms. Laboratory assessments
useful for identifying etiology may include urinalysis, blood tests for
congenital or early-onset infection (e.g., cytomegalovirus, syphilis,
toxoplasmosis), and specimen analyses for genetic conditions associated
with hearing loss.
c) Other medical specialists: The etiology of neonatal hearing loss may
remain uncertain in as many as 30% to 40% of children. However, most
congenital hearing loss is hereditary, and nearly 200 syndromic and
nonsyndromic forms have already been identified (Brookhouser, Worthington,
& Kelly, 1994). For 20% to 30% of children, there are associated
clinical findings that can be of importance in patient management. Where
thorough physical and laboratory investigations fail to define the
etiology of hearing loss, families should be offered the option of genetic
evaluation and counseling by a medical geneticist. The medical geneticist
is responsible for the collection and interpretation of family history
data, the clinical evaluation and diagnosis of inherited diseases, the
performance and assessment of genetic tests, and the provision of genetic
counseling. Geneticists are qualified to interpret the significance and
limitations of new tests and to convey the current status of knowledge
during genetic counseling.
Other medical specialty areas, including developmental pediatrics,
neurology, ophthalmology, cardiology and nephrology, may be consulted to
determine the presence of related body-system disorders as part of
syndromes associated with hearing loss. In addition, every infant with
hearing loss should receive an ophthalmologic evaluation at regular
intervals to rule out concomitant late-onset vision disorders (Gallaudet
University Center for Assessment and Demographic Study, 1998; Johnson,
1999). Many infants with hearing loss will have received care in an NICU.
Because NICU-enrolled infants will demonstrate other developmental
disorders, the assistance of a developmental pediatrician may be valuable
for management of these infants.
3. Benchmarks and quality indicators for the confirmation of hearing
loss.
(a) Benchmarks
There are few published data available to provide targets for programs
involved in confirmation of hearing loss. Until benchmark data that
provide a goal are published, programs should strive to provide care to
100% of infants needing services.
1. Comprehensive services for infants and families referred
following screening are coordinated between the infant's medical home,
family, and related professionals with expertise in hearing loss and the
state and local agencies responsible for provision of services to children
with hearing loss.
2. Infants referred from UNHS begin audiologic and medical
evaluations before 3 months of age or 3 months after discharge for NICU
infants (Dalzell et al., 2000).
3. Infants with evidence of hearing loss on audiologic assessment
receive an otologic evaluation.
4. Families and professionals perceive the medical and audiologic
evaluation process as positive and supportive.
5. Families receive referral to Part C coordinating agencies,
appropriate intervention programs, parent/consumer and professional
organizations, and child-find coordinators if necessary.
(b) Associated quality indicators of the confirmation of hearing loss
component of the EHDI programs may include the following:
1. Percentage of infants and families whose care is coordinated
between the medical home and related professionals.
2. Percentage of infants whose audiologic and medical evaluations
are obtained before an infant is 3 months of age.
3. Percentage of infants with confirmed hearing loss referred for
otologic evaluation.
4. Percentage of families who accept audiologic and medical
evaluation services.
5. Percentage of families of infants with confirmed hearing loss
that have a signed IFSP by the time the infant reaches 6 months of age.
D. Early Intervention (Principles 3 and 8)
The mounting evidence for the crucial nature of early experience in
brain development provides the impetus to ensure learning opportunities
for all infants (Kuhl et al., 1997; Kuhl, Williams, Lacerda, Stevens,
& Lindblom, 1992; Sininger, Doyle, & Moore, 1999). Research
demonstrates that intensive early intervention can alter positively the
cognitive and developmental outcomes of young infants with disabilities or
infants who are socially and economically disadvantaged (Guralnick, 1997;
Infant Health and Development Program, 1990; Ramey & Ramey, 1992,
1998). Yoshinaga-Itano, Sedey, Coulter, and Mehl (1998), Moeller (in
press), and Carney and Moeller (1998) have corroborated these findings in
infants with hearing loss.
1. Early Intervention Program Development. Early intervention
services should be designed to meet the individualized needs of the infant
and family, including addressing acquisition of communicative competence,
social skills, emotional well-being, and positive self-esteem (Karchmer
& Allen, 1999). Six frequently cited principles of effective early
intervention are (1) developmental timing, (2) program intensity, (3)
direct learning, (4) program breadth and flexibility, (5) recognition of
individual differences, and (6) environmental support and family
involvement (Meadow-Orleans, Mertens, Sass-Lehrer, & Scott-Olson,
1997; Moeller & Condon, 1994; Ramey & Ramey, 1992, 1998;
Stredler-Brown, 1998; Thomblin, Spencer, Flock, Tyler, & Gantz,
1999).
Developmental timing refers to the age at which services begin and the
duration of enrollment. Programs that enroll infants at younger ages and
continue longer are found to produce the greatest benefits. Program
intensity refers to the amount of intervention and is measured by multiple
factors, such as the number of home visits/contacts per week for the
infant and the family's participation in intervention. Greater
developmental progress occurs when the infant and family are actively and
regularly involved in the intervention. The principle of direct learning
encompasses the idea that center-based and home-based learning experiences
are more effective when there is direct (provided by trained
professionals) as well as indirect intervention. The principle of program
breadth and flexibility notes that successful intervention programs offer
a broad spectrum of services and are flexible and multifaceted to meet the
unique needs of the infant and family. Rates of progress and benefits from
programs are functions of infant and family individual differences; not
everyone progresses at the same rate nor benefits from programs to the
same extent. Finally, the benefits of early intervention continue over
time depending on the effectiveness of existing supports: family
involvement and other environmental supports (e.g., home, school, health,
and peer) (Ramey & Ramey, 1992). Individualization in intervention
tailors the services to be developmentally appropriate and recognizes
meaningful individual and family differences (Cohen, 1993, 1997).
Optimal intervention strategies for the infant with any hearing loss
require that intervention begin as soon as there is confirmation of a
permanent hearing loss to enhance the child's acquisition of
developmentally appropriate language skills. All infants with the targeted
hearing loss are at risk for delayed communication development and should
receive early intervention services (Bess, Dodd-Murphy, & Parker,
1998; Rushmer, 1992). Early intervention provides appropriate services for
the child with hearing loss and assures that families receive
consumer-oriented information. Documented discussion must occur about the
full range of resources in early intervention and education programs for
children with hearing loss.
In supplying information to families, professionals must recognize and
respect the family's natural transitions through the grieving process at
the time of initial diagnosis of hearing loss and at different
intervention decision-making stages (Cherow, Dickman, & Epstein, 1999;
Luterman, 1985; Luterman & Kurtzer-White, 1999). The range of
intervention options should be reviewed at least every 6 months. Families
should be apprised of individuals who and organizations that can enhance
informed decision-making such as peer models, persons who are hard of
hearing and deaf, and consumer and professional associations
(Baker-Hawkins & Easterbrooks, 1994; Cherow, Dickman, & Epstein,
1999).
Early intervention must be preceded by a comprehensive assessment of
the infant's and family's needs and the family's informed decision-making
related to those needs (Stredler-Brown & Yoshinaga-Itano, 1994).
Federal law provides funds for states to participate in early intervention
services for infants with hearing loss (Public Law 105-17: the amendments
to the Individuals with Disabilities Education Act, IDEA 1997; U.S.
Department of Education, Office of Special Education and Rehabilitative
Services, 1998). Part C of IDEA requires that an interdisciplinary
developmental evaluation be completed to determine the child's level of
functioning in each of the following developmental areas: cognitive,
physical, and communicative development; social or emotional development;
and adaptive development (34 C.F.R. Part 303 §303.322). The IFSP is to be
developed by the family and service coordinator (Joint Committee of ASHA
and Council on Education of the Deaf, 1994). The IFSP specifies needs,
outcomes, intervention components, and anticipated developmental progress.
The full evaluation process must be completed within 45 days of primary
referral. However, intervention services may commence before completion of
the full evaluation of all developmental areas and during the confirmation
of the hearing loss if parent/guardian consent is obtained and an interim
IFSP is developed (Matkin, 1988). Once services are begun, ongoing
assessment of progress is crucial to determine appropriateness of the
intervention strategies. In addition, the family and service coordinator
must review the IFSP at least every 6 months to determine whether progress
toward achieving the outcomes is being made and whether the outcomes
should be modified or revised. The IFSP must be evaluated at least
annually and–taking into consideration the results of any current
evaluations, progress made, and other new information, revised as
appropriate (34 CFR Part 303 §303.342).
Thirty to 40% of children with hearing loss demonstrate additional
disabilities that may have concomitant effects on communication and
related development (Gallaudet University Center for Assessment and
Demographic Study, 1998; Schildroth & Hotto, 1993). Thus,
interdisciplinary assessment and intervention are essential to address the
developmental needs of all children who are hard of hearing or deaf,
especially those with additional developmental disabilities (Cherow,
Dickman, & Epstein, 1999; Cherow, Matkin, & Trybus, 1985).
The diverse demographics of infants with hearing loss and their
families highlight the importance of shaping the early intervention
curriculum to the infant and family profile (Calderon, Bargones, &
Sidman, 1998; Karchmer & Allen, 1999). Families who live in
underserved areas may have less accessibility, fewer professional
resources, deaf or hard of hearing role models, or sign language
interpreters available to assist them. A growing number of children with
hearing loss in the United States are from families that are non-native
English speaking (Baker-Hawkins & Easterbrooks, 1994; Christensen
& Delgado, 1993; Cohen, 1997; Cohen, Fischgrund, & Redding, 1990;
Scott, 1998). These factors underscore the necessity of providing
comprehensive, culturally sensitive information to families–information
that is responsive to their needs and that results in informed choices
(Schwartz, 1996).
2. Audiologic Habilitation. The vast majority of infants and
children with bilateral hearing loss benefit from some form of personal
amplification or sensory device (Pediatric Working Group of the Conference
on Amplification for Children with Auditory Deficits, 1996). If the family
chooses individualized personal amplification for their infant, hearing
aid selection and fitting should be provided by the audiologist in a
timely fashion. Delay between confirmation of the hearing loss and
amplification should be minimized (Arehart, Yoshinaga-Itano, Thomson,
Gabbard, & Stredler Brown, 1998).
Hearing aid fitting proceeds optimally when the results of the medical
evaluation and physiologic (OAE and ABR) and behavioral audiologic
assessments are in accord. However, the provision of amplification should
proceed based on physiologic measures alone if behavioral measures of
threshold are precluded because of the infant's age or developmental
level. In such cases, behavioral measures should be obtained as soon as
possible to corroborate the physiologic findings. The goal of
amplification fitting is to provide the infant with maximum access to the
acoustic features of speech within a listening range that is safe and
comfortable. That is, amplified speech should be comfortably above the
infant's sensory threshold, but below the level of discomfort across the
speech frequency range for both ears (Pediatric Working Group of the
Conference on Amplification for Children with Auditory Deficits,
1996).
The amplification fitting protocol should combine prescriptive
procedures that incorporate individual real-ear measurements (Pediatric
Working Group of the Conference on Amplification for Children with
Auditory Deficits, 1996). These techniques allow amplification to be
individually fitted to meet the unique characteristics of each infant's
hearing loss. Validation of the benefits of amplification, particularly
for speech perception, should be examined in the infant's typical
listening environments. Complementary or alternative sensory technology
(FM systems, vibrotactile aids, or cochlear implants) may be recommended
as the primary and/or secondary listening device, depending on the degree
of the infant's hearing loss, goals of auditory habilitation, acoustic
environments, and family's informed choices (ASHA, 1991). Long-term
monitoring of personal amplification requires audiologic assessment;
electroacoustic, real-ear, and functional checks of the
amplification/listening device, as well as refinement of the prescriptive
targets. Long-term monitoring also includes continual validation of
communication, social-emotional, cognitive, and later academic development
to assure that progress is commensurate with the infant's abilities. The
latter data are obtained through interdisciplinary evaluation and
collaboration by the IFSP team that includes the family.
The impact of otitis media with effusion (OME) is greater for infants
with sensorineural hearing loss than those with normal cochlear function.
Sensory or permanent conductive hearing loss is compounded by additional
conductive hearing loss associated with OME. OME further reduces access to
auditory/oral language stimulation and spoken language development for
infants whose families choose an auditory-oral approach to communication
development. Prompt referral to otolaryngologists for treatment of
persistent or recurrent OME is indicated in infants with sensorineural
hearing loss. Ongoing medical/surgical management of OME may be needed to
resolve the condition. Management of OME, however, should not delay the
prompt fitting of amplification unless there are medical contraindications
(Brookhouser, Worthington, & Kelly, 1994).
3. Medical and Surgical Intervention. Medical intervention is
the process by which a physician provides medical diagnosis and direction
for medical and/or surgical treatment options for hearing loss and/or
related medical disorder(s) associated with hearing loss. Treatment varies
from the removal of cerumen and the treatment of otitis media with
effusion to long-term plans for reconstructive surgery and assessment of
candidacy for cochlear implants. If necessary, surgical treatment of
malformation of the outer and middle ears should be considered in the
intervention plan for infants with conductive or sensorineural plus
conductive hearing loss. Cochlear implants may be an option for certain
children age 12 months and older with profound hearing loss who show
limited benefit from conventional amplifications. As noted above, in
infants with identified sensorineural hearing loss, the presence of otitis
media needs to be recognized promptly and treated, with the infant
monitored on a periodic basis.
4. Communication Assessment and Intervention. Language is
acquired with greater ease during certain sensitive periods of infants'
and toddlers' development (Clark, 1994; Mahshie, 1995). The process of
language acquisition includes learning the precursors of language, such as
the rules pertaining to selective attention and turn taking (Kuhl et al.,
1997; Kuhl, Williams, Lacerda, Stevens, & Lindblom, 1992). Cognitive,
social, and emotional developments depend on the acquisition of language.
Development in these areas is synergistic. A complete language evaluation
should be performed for infants and toddlers with hearing loss. The
evaluation should include an assessment of oral, manual, and/or visual
mechanisms as well as cognitive abilities.
A primary focus of early intervention programs is to support families
in developing the communication abilities of their infants and toddlers
who are hard of hearing or deaf (Carney & Moeller, 1998). Elements of
oral and sign language development include vocal/manual babbling,
vocal/visual turn-taking, and early word/sign acquisition. Oral and/or
sign language development should be commensurate with the child's age and
cognitive abilities and should include acquisition of phonologic (for
spoken language), visual/spatial/motor (for signed language), morphologic,
semantic, syntactic, and pragmatic skills.
Early interventionists should follow family-centered principles to
assist in developing communicative competence of infants and toddlers who
are hard of hearing or deaf (Baker-Hawkins and Easterbrooks, 1994;
Bamford, 1998; Fisher, 1994). Families should be provided with information
specific to language development and with family-involved activities that
facilitate language development. Early interventionists should ensure
access to peer and language models. Peer models might include families
with normal hearing children as well as children or adults who are hard of
hearing and deaf as appropriate to the needs of the infant with hearing
loss (Marschark, 1997; Thompson, 1994). Depending on informed family
choices, peer models could include users of visual language (e.g.,
American Sign Language) and other signed systems as well as users of
auditory/oral communication methods for spoken language development
(Pollack, Goldberg, & Coleffe-Schenck, 1997). Information on visual
communication methods such as American Sign Language, other signed
systems, and cued speech should be provided. Information on oral/auditory
language, personal hearing aids, and assistive devices such as FM systems,
tactile aids, and cochlear implants should also be made available.
The specific goals of early intervention are to facilitate
developmentally appropriate language skills, enhance the family's
understanding of its infant's strengths and needs, and promote the
family's ability to advocate for its infant. Early intervention should
also build family support and confidence in parenting the infant who is
deaf or hard of hearing and increase the family's satisfaction with the
EHDI process (Fisher, 1994; U.S. Department of Education, Office of
Special Education and Rehabilitative Services, 1998). Provision of early
intervention services includes monitoring participation and progress of
the infant and family as well as adapting and modifying interventions as
needed. Systematic documentation of the intervention approach facilitates
decision-making on program changes.
5. Benchmarks and Quality Indicators for Early Intervention
Programs.
(a) Benchmarks
It should be the goal of the intervention component of an EHDI program
that all infants be served as described below. Because specific benchmarks
for early intervention have yet to be reported, target percentages are not
noted here. The JCIH strongly recommends that these data be obtained so
that benchmarks may be made available.
- Infants with hearing loss are enrolled in a family-centered
early intervention program before 6 months of age.
- Infants with hearing loss are enrolled in a family-centered early
intervention program with professional personnel who are knowledgeable
about the communication needs of infants with hearing loss.
- Infants with hearing loss and no medical contraindication
begin use of amplification when appropriate and agreed on by the family
within 1 month of confirmation of the hearing loss.
- Infants with amplification receive ongoing audiologic monitoring at
intervals not to exceed 3 months.
- Infants enrolled in early intervention achieve language development
in the family's chosen communication mode that is commensurate with the
infant's developmental level as documented in the IFSP and that is
similar to that for hearing peers of a comparable developmental age.
- Families participate in and express satisfaction with self-advocacy.
(b) Quality indicators for the intervention services may include the
following:
- Percentage of infants with hearing loss who are enrolled
in a family-centered early intervention program before 6 months of age
- Percentage of infants with hearing loss who are enrolled in an
early intervention program with professional personnel who are
knowledgeable about overall child development as well as the
communication needs and intervention options for infants with hearing
loss
- Percentage of infants in early intervention who receive
language evaluations at 6-month intervals
- Percentage of infants and toddlers whose language levels,
whether spoken or signed, are commensurate with those of their hearing
peers
- Percentage of infants and families who achieve the outcomes
identified on their IFSP
- Percentage of infants with hearing loss and no medical
contraindication who begin use of amplification when agreed on by the
family within 1 month of confirmation of the hearing loss
- Percentage of infants with amplification who receive ongoing
audiologic monitoring at intervals not to exceed 3 months.
- Number of follow-up visits for amplification monitoring and
adjustment within the first year following amplification fitting
- Percentage of families who refuse early intervention services
- Percentage of families who participate in and express satisfaction
with self-advocacy
E. Continued Surveillance of Infants and Toddlers (Principle 4)
Since 1972, the JCIH has identified specific risk indicators that often
are associated with infant and childhood hearing loss. These risk
indicators have been applied both in the United States and in other
countries and serve two purposes. First, risk indicators help identify
infants who should receive audiologic evaluation and who live in
geographic locations (e.g., developing nations, remote areas) where
universal hearing screening is not yet available. The JCIH no longer
recommends programs calling for screening at-risk infants because such
programs will identify approximately 50% of infants with hearing loss;
however, these programs may be useful where resources limit the
development of universal newborn hearing screening. Second, because normal
hearing at birth does not preclude delayed onset or acquired hearing loss,
risk indicators help identify infants who should receive on-going
audiologic and medical monitoring and surveillance.
Risk indicators can be divided into two categories: those present
during the neonatal period and those that may develop as a result of
certain medical conditions or essential medical interventions in the
treatment of an ill child. Risk indicators published in the 1994 Position
Statement are revised in 2000 to take account of current information.
Specifically, data have been considered from an epidemiological study of
permanent childhood hearing impairment in the Trent Region of Great
Britain from 1985 through 1993 (Fortnum & Davis, 1997) and the recent
NIH multicenter study, "Identification of Neonatal Hearing Impairment"
(Norton et al., in press). Cone-Wesson et al. (in press) analyzed the
prevalence of risk indicators for infants identified with hearing loss in
that study. Three thousand one hundred thirty-four infants evaluated
during their initial birth hospitalization were reevaluated for the
presence of hearing loss between 8 and 12 months of age. The majority of
these infants were NICU graduates (2,847), and the remaining 287 infants
had risk indicators for hearing loss that did not require intensive care,
such as family history or craniofacial anomalies. Infants with history or
evidence of transient middle ear dysfunction were excluded from the final
analysis, revealing 56 with permanent hearing loss.
Cone-Wesson et al. (in press) determined the prevalence of hearing loss
for each risk factor by dividing the number of infants with the risk
factor and hearing loss by the total number of infants in the sample with
a given risk factor. Hearing loss was present in 11.7% of infants with
syndromes associated with hearing loss, which included Trisomy 21; Pierre
Robin syndrome; CHARGE syndrome; choanal atresia; Rubinstein-Taybi
syndrome; Stickler syndrome; and oculo-auriculo-vertebral (OAV) spectrum
(also known as Goldenhar syndrome). Family history of hearing loss had a
prevalence of 6.6%, meningitis 5.5%, and craniofacial anomalies 4.7%. In
contrast, infants treated with aminogycoside antibiotics had a prevalence
of hearing loss of only 1.5%, consistent with data of Finitzo-Hieber,
McCracken, & Brown (1985). Analyzing risk indicators, such as
ototoxicity, by prevalence points out that although a large number of NICU
infants with hearing loss have a history of aminogycoside treatment, only
a small percentage of those receiving potentially ototoxic antibiotics
actually incurred hearing loss. In fact, 45% of infants treated in the
NICU received such treatment (Vohr et al., in press).
1. Given these current data, the JCIH risk indicators have been
modified for use in neonates (birth through age 28 days) where universal
hearing screening is not yet available. These indicators are as
follows:
(a) An illness or condition requiring admission of 48 hours or
greater to a NICU (Cone-Wesson et al., in press; Fortnum & Davis,
1997).
(b) Stigmata or other findings associated with a syndrome known to
include a sensorineural and or conductive hearing loss (Cone-Wesson et
al., in press).
(c) Family history of permanent childhood sensorineural hearing loss
(Cone-Wesson et al., in press; Fortnum & Davis, 1997).
(d) Craniofacial anomalies, including those with morphological
abnormalities of the pinna and ear canal (Cone-Wesson et al., in press;
Fortnum & Davis, 1997).
(e) In utero infection such as cytomegalovirus, herpes,
toxoplasmosis, or rubella (Demmler, 1991; Littman, Demmler, Williams,
Istas, & Griesser, 1995; Williamson, Demmler, Percy, & Catlin,
1992).
Interpretation of the Cone-Wesson et al. (in press) data reveals that 1
of 56 infants identified with permanent hearing loss revealed clear
evidence of late-onset hearing loss by 1 year of age. The definition of
late-onset hearing loss for this analysis was a present ABR at 30 dB in
the newborn period and hearing thresholds by visual reinforcement
audiometry at age 8-12 months >40 dB for all stimuli. The infant with
late-onset loss passed screening ABR, TOAE, and DPOAE during the newborn
period but had reliable behavioral thresholds revealing a severe hearing
loss at 1 year of age. Risk indicators for this infant included low
birthweight, respiratory distress syndrome, bronchio-pulmonary dysplasia,
and 36 days of mechanical ventilation. Although these data are valuable,
additional study of large samples of infants is needed before risk
indicators for progressive or delayed-onset hearing loss can be clearly
defined.
2. The JCIH recommends the following indicators for use with neonates
or infants (29 days through 2 years). These indicators place an infant at
risk for progressive or delayed-onset sensorineural hearing loss and/or
conductive hearing loss. Any infant with these risk indicators for
progressive or delayed-onset hearing loss who has passed the birth screen
should, nonetheless, receive audiologic monitoring every 6 months until
age 3 years. These indicators are as follows:
(a) Parental or caregiver concern regarding hearing, speech,
language, and or developmental delay.
(b) Family history of permanent childhood hearing loss (Grundfast,
1996).
(c) Stigmata or other findings associated with a syndrome known to
include a sensorineural or conductive hearing loss or eustachian tube
dysfunction.
(d) Postnatal infections associated with sensorineural hearing loss
including bacterial meningitis (Ozdamar, Kraus, & Stein, 1983).
(e) In utero infections such as cytomegalovirus, herpes, rubella,
syphilis, and toxoplasmosis.
(f) Neonatal indicators–specifically hyperbilirubinemia at a serum
level requiring exchange transfusion, persistent pulmonary hypertension
of the newborn associated with mechanical ventilation, and conditions
requiring the use of extracorporeal membrane oxygenation (ECMO) (Roizen,
1999).
(g) Syndromes associated with progressive hearing loss such as
neurofibromatosis, osteopetrosis, and Usher's syndrome.
(h) Neurodegenerative disorders, such as Hunter syndrome, or sensory
motor neuropathies, such as Friedreich's ataxia and Charcot-Marie-Tooth
syndrome.
(i) Head trauma.
(j) Recurrent or persistent otitis media with effusion for at least 3
months (Stool et al. 1994).
Because some important indicators, such as family history of hearing
loss, may not be determined during the course of UNHS programs, the
presence of all late-onset risk indicators should be determined in the
medical home during early well-baby visits. Those infants with significant
late-onset risk factors should be carefully monitored for normal
communication developmental milestones during routine medical care.
The JCIH recommends ongoing audiologic and medical monitoring of
infants with unilateral, mild, or chronic conductive hearing loss. Infants
and children with mild or unilateral hearing loss may also experience
adverse speech, language, and communication skill development, as well as
difficulties with social, emotional, and educational development (Bess,
Dodd-Murphy, & Parker, 1998; Blair, Petterson, & Viehweg, 1985;
Davis, Elfenbein, Schum, & Bentler, 1986; Matkin & Bess, 1998;
Roush & Matkin, 1994; Tharpe & Bess, 1995). Infants with
unilateral hearing loss are at risk for progressive and/or bilateral
hearing loss (Brookhouser, Worthington, & Kelly, 1994). Infants with
frequent episodes of OME also require additional vigilance to address the
potential adverse effects of fluctuating conductive hearing loss
associated with persistent or recurrent OME (Friel-Patti & Finitzo,
1990; Friel-Patti, Finitzo, Meyerhoff, & Hieber, 1986; Friel-Patti,
Finitzo-Hieber, Conti, & Brown, 1982; Gravel & Wallace, 1992;
Jerger, Jerger, Alford, & Abrams, 1983; Roberts, Burchinal, &
Medley, 1995; Stool et al., 1994; Wallace et al., 1988).
The population of infants cared for in the NICU may also be at
increased risk for neural conduction and/or auditory brainstem
dysfunction, including auditory neuropathy. Auditory neuropathy is a
recently identified disorder, characterized by a unique constellation of
behavioral and physiologic auditory test results (Gravel & Stapells,
1993; Kraus, Ozdamar, Stein, & Reed, 1984; Sininger, Hood, Starr,
Berlin, & and Picton, 1995; Starr, Picton, Sininger, Hood, &
Berlin, 1996; Stein et al., 1996). Behaviorally, children with auditory
neuropathy have been reported to exhibit mild-to-profound hearing loss and
poor speech perception. Physiologic measures of auditory function (e.g.,
otoacoustic emissions and auditory brainstem response) demonstrate the
finding of normal OAEs (suggesting normal outer hair cell function) and
atypical or absent ABRs (suggesting neural conduction dysfunction).
Reports suggest that those at increased risk for auditory neuropathy are
(a) infants with a compromised neonatal course who receive intensive
neonatal care (Berlin et al., 1999; Stein et al., 1996), (b) children with
a family history of childhood hearing loss (Corley & Crabbe, 1999),
and (c) infants with hyperbilirubinemia (Stein et al., 1996). Currently,
neither the prevalence of auditory neuropathy in newborns nor the natural
history of the disorder is known, and treatment options are not well
defined. Audiologic and medical monitoring of infants at risk for auditory
neuropathy is recommended. Infants with these disorders can be detected
only by the use of OAE and ABR technology used in combination. Prospective
investigations of this neural conduction disorder are warranted (see
Future Directions).
F. Protection of Infants' and Families' Rights (Principles 5 and
6)
Each agency or institution involved in the EHDI process shares the
responsibility for protecting infant and family rights. These rights
include access to UNHS, information in the family's native language,
choice, and confidentiality (NIDCD, 1999). Families should receive
information about childhood hearing loss in consumer-oriented language.
The information should cover the prevalence and effects of early hearing
loss, the potential benefits and risks of screening and evaluation
procedures, and the prognosis with and without early identification and
intervention. Alternative funding sources should be sought if the
parent(s) or legal guardian desires to have the infant screened for
hearing loss but does not have a reimbursement option.
Families have the same right to accept or decline hearing screening or
any follow-up care for their newborn as they do any other screening or
evaluation procedures or intervention. Implied or written consent
consistent with the protocol of the hospital or the requirements of the
state should be obtained for newborn hearing screening after determining
the family or legal guardian have been provided appropriate educational
materials and have had their questions answered by qualified health care
personnel.
The results of screening are to be communicated verbally and in writing
to families by health care professionals knowledgeable about hearing loss
and the appropriate interpretation of the screening results. EHDI data
merit the same level of confidentiality and security afforded all other
health care and education information in practice and law. The newborn and
his or her family have the right to confidentiality of the screening and
follow-up assessments and the acceptance or rejection of suggested
intervention(s). Consent of the parent or guardian is the basic legal
requisite for disclosure of medical information. In compliance with
federal and state laws, mechanisms should be established that assure
parental release and approval of all communications regarding the infant's
test results, including those to the infant's medical home and early
intervention coordinating agency and programs. Confidentiality requires
that family and infant information not be transmitted or accessible in
unsecured data formats. An effective information system is a tool to
assure both proper communication and confidentiality of EHDI information.
G. Information Infrastructure (Principles 7 and 8)
In concert with the 1994 Position Statement (JCIH, 1994a,b), the JCIH
recommends development of uniform state registries and national
information databases incorporating standardized methodology, reporting,
and system evaluation. The choice of an information management system
affects what questions can be answered and what tools are available for
infant and family management and for program evaluation and reporting
(Pool, 1996). Management and use of information generated by newborn
hearing screening, evaluation, and intervention programs require careful
consideration by service providers, state-specific lead coordinating
agencies, statewide advisory committees, and state and federal funding and
regulatory agencies. Federal and state agencies need to standardize data
definitions to ensure the value of state registries and federal data sets
and to prevent misleading or unreliable information (O'Neal, 1997).
Information management should be used to improve services to infants and
their families; to assess the quality of screening, evaluation, and
intervention; and to facilitate collection of data on demographics of
neonatal and infant hearing loss.
To achieve the first goal of improving services to infants and their
families, multiple system components (e.g., hospitals, practitioners,
public health, and public and private education agencies) that provide
care for infants and families should be integrated. Optimally, and within
the limits of confidentiality as defined by state regulation and parental
informed consent, each service provider within the EHDI system (e.g.,
hospital, practitioner, public health agency, and public and private
education agencies) participates in information management in order to
track elements of care to each infant and family. The information obtained
while using an effective information management system allows for the
accurate and timely description of services provided to each infant and
documents recommendations for follow-up and referral to other providers.
Such information permits prospective monitoring of outcomes for each
infant screened and assures that each infant is connected to the services
he or she needs.
In addition to ensuring that each infant receives all needed services,
effective information management is used to promote program measurement
and accountability. Although recent survey data suggest that hospitals are
successfully initiating universal screening, EHDI services including
confirmation of hearing loss, fitting of amplification, and initiation of
early intervention remain delayed (Arehart, Yoshinaga-Itano, Thomson,
Gabbard, & Stredler Brown, 1998). One factor contributing to the delay
beyond the 1994 and 2000 JCIH recommendations may be that few states have
mandatory statewide information management, similar to that described
here, that is capable of spanning the entire EHDI process (Hayes,
1999).
The information obtained from the information management system should
assist both the individual provider and the lead coordinating agency in
measuring quality indicators associated with program services (e.g.,
screening, evaluation, and/or intervention). Those professionals closest
to the process should be responsible for program evaluation using the
benchmarks and quality indicators suggested in this document. The
information system should provide the measurement tools to determine the
degree to which each process (e.g., screening, evaluation, and
intervention) is stable, sustainable, and conforms to program benchmarks.
Timely and accurate monitoring of relevant quality measures is
essential.
Effective information management is capable of aggregating individual
infant data from multiple EHDI service providers including hospitals,
practitioners, public health agencies, and public and private education
agencies. This information provides the basis for evaluating the
effectiveness of the EHDI programs in meeting program goals of universal
screening, prompt evaluation, and early and effective intervention.
Tracking families through the systems of screening, evaluation, and
intervention will permit quantification of the number of infants requiring
and receiving services, and document the types of service during a
specific period. Tracking improves the ability to identify infants who are
lost to follow-up at any stage of the EHDI process. Until centralized
statewide tracking, reporting, and coordination are mandatory, the
transition of infants and families from screening to confirmation of
hearing loss to intervention will continue to be problematic (Diefendorf
& Finitzo, 1997).
The JCIH endorses the concept of a national database to permit
documentation of the demographics of neonatal hearing loss, including
prevalence and etiology across the United States. The development of a
national database, in which aggregate state data reside, is achievable
only with standardization of data elements and definitions (O'Neal, 1997).
Standardized data management systems will ensure that appropriate data are
collected and transmitted from statewide EHDI programs to the national
data system. Data transmitted from the states to the federal level need
not include individually identifiable patient or family information.
The request for information moves from the federal level to the state
level and from the state to the hospitals and practitioners. Requirements
from federal levels drive what data are collected and maintained at the
state and hospital level. The flow of information should move from the
hospital and practitioner to the state and federal levels through an
integrated information system. Hospitals may collect and monitor data not
required at the state level. Not all data collected as part of a universal
newborn hearing screening program at the hospital or by the practitioner
are needed at the state level, especially for the infant who passes the
birth hearing screening with no risk indicators. Similarly, states may
choose to collect data and monitor an expanded data set not required at
the federal level. Information on the care status of an individual infant
is not needed at the federal level.
The Bureau of Maternal and Child Health (MCHB) currently requires that
each state report two data items: the number of live births and the number
of newborns screened for hearing loss during the birth admission. The
Centers for Disease Control and Prevention (CDC) are requesting that
states submit 10 data items. CDC in conjunction with the Directors of
Speech and Hearing Programs in State Health and Welfare Agencies
(DSHPSHWA)began a pilot effort in 1999 to assess the feasibility and
logistics of developing and reporting a national EHDI data set. The Pilot
National Data Set includes the number of birthing hospitals in the state
and the number of hospitals with universal hearing screening programs; the
number of live births in the state and the number of infants screened for
hearing loss before discharge from the hospital; the number of infants
referred for audiologic evaluation before 1 month of age and the number
with an audiologic evaluation before 3 months; the number of infants with
permanent congenital hearing loss; the mean, median, and minimum age of
diagnosis of hearing loss for infants identified in a newborn hearing
screening program; and the number of infants with permanent hearing loss
receiving intervention by 6 months. Such data could be used to examine
prevalence of hearing loss by state or region, to support legislation for
services to infants who are hard of hearing and deaf and their families,
and to provide national benchmarks and quality indicators.
IV. Future Directions
New opportunities and challenges are presented by the current efforts
directed at the early identification, assessment, and intervention for
newborns and very young infants with hearing loss. Ultimately, the
development of communication skills commensurate with cognitive abilities
and cultural beliefs in the preferred modality of the family is the goal
for all infants and children who are hard of hearing and deaf. Achievement
of this goal will permit these children to avail themselves of all
educational, social, and vocational opportunities in order to achieve full
participation in society across the life span. To assure that such
opportunities are available, universities should assume responsibility for
special-track, interdisciplinary, professional education programs on early
intervention for the child who is deaf or hard of hearing. Universities
should also introduce training in family systems, the grieving process,
cultural diversity, and Deaf culture.
Early identification efforts will be enhanced by the new technology
designed specifically for the detection of hearing loss in the newborn
period. The growing demand for screening programs will necessitate
screening technology that is both rapid and highly reliable. Techniques or
combinations of techniques will be required to identify the site of the
hearing loss (conductive, cochlear, or neural). The development of middle
ear reflectance measures may someday enable screening programs to
determine accurately if middle ear dysfunction is contributing to the
screening test outcome.
Because of newborn hearing screening, it will be possible to determine
what proportion of early onset hearing losses are truly congenital versus
those that occur postnatally. It will be possible to determine which types
of hearing losses are stable as opposed to fluctuating and/or progressive.
Intervention strategies could be tailored to the expected clinical course
for each infant. Intervention will also be aimed at preventing the onset
or delaying the progression of sensorineural hearing losses. Thus,
objective techniques must be developed to assess the integrity and
physiology of the inner ear.
Increasing reports of the deleterious effects of auditory neuropathy
support the need for prospective studies in large birth populations to
determine its prevalence and natural history (Gravel & Stapells, 1993;
Kraus, Ozdamar, Stein, & Reed, 1984; Sininger, Hood, Starr, Berlin,
& and Picton, 1995; Starr, Picton, Sininger, Hood, & Berlin, 1996;
Stein et al., 1996). Consensus development is needed concerning
appropriate early intervention strategies for infants with auditory
neuropathy. As more information on this disorder becomes available,
hearing screening protocols may need to be revised in order to allow the
detection of auditory neuropathy in newborns.
The JCIH anticipates that the earliest audiologic assessments, and
subsequently the determination of appropriate interventions, will continue
to rely on the use of physiologic measures. In particular, ABR air- and
bone-conduction techniques could be used for rapid, reliable, and
frequency-specific threshold assessment. The further development of these
techniques for use with very young infants would be useful in the early
comprehensive assessment process. Timely evaluation of hearing sensitivity
will prevent delay in confirming the existence of a hearing loss and
initiating appropriate audiologic, medical/surgical, and developmental
intervention.
Amplification fitting will rely on pediatric prescriptive formulas
individualized with real-ear measures and modifications (such as
real-ear-to-coupler differences) to select and evaluate hearing aid
fittings. Technological advances in digital and programmable hearing aids
and alternative strategies such as frequency transposition hearing aids
will facilitate more effective early intervention. The age of cochlear
implantation for profoundly deaf children may be lowered proportionately
with the earlier age of identification. Accurate selection and fitting of
these devices in the infant or very young child will require reliance on
objective (physiologic) assessment tools as well. These predictive
measures, such as electrical ABR or electrical middle ear muscle reflexes
obtained with stimulation delivered via the implant, must be validated in
older children and adults to prepare for use in infants and prelinguistic
children.
Health, social service, and education agencies associated with early
intervention and Head Start programs should be prepared for a dramatic
escalation in the need for family-centered infant intervention services.
Because of the early identification and intervention programs, the JCIH
anticipates that children who are hard of hearing and deaf who have
received early identification and intervention will perform quite
differently from their later-identified peers. As these children enter
formal education, systems will need the flexibility to assess and respond
to the abilities of these children appropriately.
With advances in human genetic research and the completion of the
national Human Genome Project, thousands of genes associated with a
variety of conditions will be discovered in the coming decade (Khoury,
1999). The identification of 11 genes for nonsyndromic deafness reported
by the end of 1998 (Morton, 1999) provides the impetus for formulating
strategies for population-based studies in the genetics of hearing loss.
Although many different genes may be associated with nonsyndromic
deafness, research indicates that a few of these genes may be responsible
for a significant percentage of these cases. DFNB1, which is a gene
responsible for recessive, nonsyndromic, sensorineural hearing loss, has
been found to cause approximately 15% of all infant hearing loss (Cohn et
al., 1999; Denoyelle, 1999). Currently, tests for the common mutations
will detect 95% of DFNB1 in Caucasian families without consanguinity
(Green et al., 1999). A positive test outcome for DFNB1 will eliminate the
need for a CT scan, perchlorate washout, and tests for retinitis
pigmentosa.
Studies in the genetics of hearing loss could facilitate diagnosis,
including identification of risk indicators for progressive or
delayed-onset hearing loss. Advanced knowledge regarding recessive genes
responsible for nonsyndromic hearing loss could dramatically reduce the
number of children whose hearing loss is classified as etiologically
unknown. Increased sophistication in diagnosis may lead to new techniques
for medical and/or surgical intervention. Otobiological research into hair
cell regeneration and protection may yield intervention strategies that
can be employed to protect the sensory mechanisms from damage by
environmental factors, such as chemotherapeutic agents or high levels of
noise or progressive forms of hearing loss.
The public health issues, as well as the ethical and policy
implications, involved in this type of research must be addressed. The
perspectives of individuals who are hard of hearing and deaf must play a
significant role in developing policies regarding the appropriate use of
genetic testing and counseling for families who carry genes associated
with hearing loss (Brick, 1999). Privacy issues, including the potential
impact of this knowledge on educational and vocational opportunities,
together with insurability, must be thoroughly considered.
These efforts will be facilitated by the federal government's new goals
in Healthy People 2010, which are as follows:
- To increase to 100 the proportion of newborns served by
state-sponsored early hearing detection and intervention programs.
- To provide 100 of newborns access to screening.
- To provide follow-up audiologic and medical evaluations before 3
months for infants requiring care.
- To provide access to intervention before 6 months for infants who
are hard of hearing and deaf.
We must assure quality in EHDI services through available benchmarks
and standards for each stage of the EHDI process. Accountability for the
outcomes of audiologic and medical evaluation and intervention services as
well as the screening process itself must be documented. Outcomes and
quality indicators obtained at the hospital, community, state, and
national levels should permit the community to draw conclusions about the
EHDI process, including its fiscal accountability (Carpenter, Bender,
Nash, & Cornman, 1996). Such information requires that data collection
be standardized, prospective, and ongoing for the next decades. The
relatively few children who are hard of hearing and deaf and who have had
the benefit of an effective EHDI system demonstrate gains in language not
commonly reported. Only when language and literacy performance data are
available for a generation of children with hearing loss who received the
benefit of early detection and intervention will the true cost of EHDI be
known. When outcomes for infants and their families are compared to the
costs of these services, the community can judge the value of EHDI.
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