Outcomes In Children With Developmental Delay And Deafness

This will be a prospective, randomized clinical trial. Deaf children (and their parent or
guardians) who meet the criteria for developmental delays (as well as the other inclusion
and exclusion criteria) will be randomly assigned to receive either hearing aids (group 1)
or a cochlear implant (group 2) and followed longitudinally for two years. If one
intervention provides improved development and quality of life over the other, this study
will provide essential evidence to support clinical decision-making in this population.
Children with normal cognition undergoing cochlear implantation will be studied as a control
cohort (group 3) in order to demonstrate to what extent the gains after cochlear
implantation in children with developmental delays parallel the gains seen in children
without developmental delays. There is no placebo group.

Specific aim 1: We will compare the changes in development between the groups. If our
hypothesis is true, auditory, linguistic, and cognitive development should demonstrate more
improvement in deaf children with developmental delays treated with cochlear implantation
compared to those treated with hearing aids.

Specific aim 2: We will compare the changes in quality of life between the groups. If our
hypothesis is true, quality of life should demonstrate more improvement in patients treated
with cochlear implantation compared to those treated with hearing aids.

Screening will be performed by the Principal Investigator (PI), his collaborators, and his
research staff at the Children's Hearing Center at Lucile Packard Children's Hospital
(LPCH).

In order to minimize investigator selection bias and in an attempt to produce study groups
that are comparable, this is a randomized study. Randomization does not guarantee comparable
study groups, particularly in a small trial like this. In order to improve the odds of
achieving comparable study groups, we have elected to stratify the randomization process by
age. Also, a block randomization process will be used. Lastly, we will compare the groups at
the end of the study by looking at their baseline assessment data and stratifying the
analysis.

Thus, patients with developmental delays will be randomized into one of two groups after the
baseline assessment. This randomization will occur through a specific process in order to
assure it is unbiased.

Outcome variables: Four general outcomes will be measured at baseline, one year after the
intervention, and two years after the intervention. The first three reflect measures of
development (auditory, linguistic, and cognitive; specific aim 1) and the last one is
quality of life (specific aim 2).

All data collection will be performed during routine clinic appointments and will not
require any special appointments.

All tests will be administered in either English or Spanish, depending on the patient's or
their parent's primary language. We have bilingual audiology, speech pathology, and
psychology personnel in our center specifically for this purpose. For self-report
questionnaires, a Spanish-interpreter provided by the hospital will be used to translate the
written materials if a Spanish version of the test is not available. If a parent is not able
to read the questionnaire (it is at a 5th grade level), it will be read to them by the
testing personnel.

1. Auditory development will be assessed by our cochlear implant audiologists using two
different techniques. Behavioral thresholds to speech will be assessed according to
standard clinical audiological guidelines. While children hearing through only one
cochlear implant cannot localize the sound (two ears are required for this), they will
typically demonstrate a behavioral response that indicates cortical perception of the
sound. Thus, this data will provide information regarding the ability of the child to
hear a sound and then generate a change in behavior. As well, auditory-evoked brainstem
response (ABR) or electrically-evoked compound action potential (eCAP) thresholds will
be measured in patients wearing their hearing aids or cochlear implant, respectively.
These data will also be collected according to standard clinical guidelines.

2. Linguistic development will be assessed by standardized speech and language testing as
well as by Systematic Analysis of Language Transcripts (SALT) coding. The standardized
tests include the Preschool Language Scale (PLS) and the Peabody Picture Vocabulary
Test (PPVT). All testing will be performed by our cochlear implant speech pathologists
according to standard clinical guidelines and we already routinely conduct the PLS and
PPVT in our clinic. The PLS is used in patients with minimal vocabulary, typically
young children, and has been validated from birth to 6 years, 11 months of age. In
contrast, the PPVT is more useful in older children who have more vocabulary. It has
been validated for children older than 2 years, 6 months of age.

Another way we propose to study language is through the use of language transcript
(SALT) coding. One benefit of this technique is that it permits the test to be adapted
to each child's abilities. Thus, there will be follow-up speech and language data on
every patient. Importantly, this technique has been used previously to assess the
effect of mild-moderate hearing loss and deafness on language development. We will
videotape the 30 minute session of the child with one of our speech therapists. This
will be performed within a speech therapy room designed for videotaping pediatric
patients. The session will be organized by the speech therapist to showcase the child's
language abilities according to standard clinical guidelines. These will include the
administration of vocabulary tests and either a narrative sample or a conversation and
expository sample. The videotape will be coded with no patient identifiers and sent to
a collaborator with expertise in infant and child language development who will perform
an independent analysis of the tape using SALT coding. The measures that will be will
be coded include the Number of Different Words (NDW), Total Number of words (TNW), Mean
Length of Utterance (MLU), and nonverbal indicators of comprehension (e.g., via
pointing and eyegaze). SALT coding of the videotapes will assess both verbal and
non-verbal communication.

3. Cognitive level will be assessed via standardized testing. The Mullen Scales of Early
Learning (MSEL) (Pearson, Bloomington, MN) is an objective measure designed for young
children to estimate intelligence. The age range for the Mullen is birth to 5 years, 8
months, though it also can be used in older children with significant cognitive
impairment such as those included in this study. Items administered for this test load
onto 5 different domains (Visual Reception, Gross Motor, Fine Motor, Expressive
Language, and Receptive Language). Because verbal and nonverbal domains are assessed
separately, this measure is particularly useful in the assessment of children who have
suspected language delays and/or hearing loss. We will perform the complete test and
analyze the change in each domain (i.e. measured before and after the intervention).
The raw scores will be used in order to have the most sensitivity in detecting changes
in patients with MR who otherwise would tend to be on the low end of the percentile
range. The Vineland Adaptive Behavior Scales (VABS) (Pearson, Bloomington, MN) provides
a measure of a child's adaptive functioning. This describes the child's ability to cope
and function effectively within their environment. This measure is a structured parent
interview and can be performed with caregivers of children from birth to adulthood. In
its entirety, the measure provides information regarding a child's functioning across
several domains including Communication, Socialization, Motor Skills, and Daily Living
Skills. We will perform the complete test and analyze the change in each subscore (i.e.
measured before and after the intervention). It is important to note that these are
psychological tests that have to be given by a highly-trained pediatric psychologist in
the proper environment. The rationale for this precaution is to minimize investigator
bias. The neurocognitive data will be collected during a single 3-4 hour visit with our
psychologist, who also measured these variables prior to the intervention as part of
the Baseline Assessment. Because this testing will always take place by the Psychology
Service and in all likelihood by the same examiner, variability will be minimized.

4. Quality of life will be assessed using three standardized techniques. The Parenting
Stress Index (PSI) identifies factors increasing the stress in the child-parent system
according to parental perception. We have substantial experience using this test
measure and have used it with our cochlear implant patients for the last several years.
The parental responses are scored and interpreted by the psychologist. The CARE-Index
will also be measured with the help of a consultant who originally developed the
CARE-Index and has tremendous experience with it. This involves videotaping and
analyzing a 3-5 minute "free play" interaction between mother and child. The recording
is later coded for maternal attentiveness, infant responsiveness and dyadic
interactions using a 14-point sensitivity scale in the CARE-Index.

Intervention:

The intervention for study participants will be performed by dedicated cochlear implant
audiologists that will do the cochlear implant or hearing aid programming for this trial.
These are highly-trained pediatric audiologists skilled in managing children with complex
and severe hearing losses. Thus, the quality of the intervention will be of the highest
level, whether it is a cochlear implant or hearing aids.

Patients in group 1 will be fit with bilateral hearing aids. These will be programmed
individually for the severity and frequency distribution of hearing loss. The type of
hearing aids used will be fit in the most appropriate fashion according to standard
audiometric criteria and our clinic norms. Patients in groups 2 and 3 will undergo cochlear
implantation. According to Food and Drug Administration guidelines, this can only occur
after they reach 12 months of age, unless an extenuating situation exists. As well, all
appropriate vaccinations will be in place prior to the surgery, per the guidelines of the
Centers for Disease Control (CDC).

Initially, we will only implant one ear. This is the current standard of care and is all
that many insurance companies will pay for. The choice of ear will be made on an individual
basis, as determined per the routine of the cochlear implant team. This choice depends on
the anatomy of the inner ear or auditory nerve and the level of residual hearing in the
ears. As well, other factors such as the handedness of the child, the tendency of the child
to rest their head on one side or the other, or parental desires also occasionally play into
this decision. If the family desires to have a second implant placed in the contralateral
ear, we will work with them and their insurance company to try and arrange this.

Patients in all three groups will require frequent follow-up visits to the audiology clinic
for device programming. Typically, these visits are more frequent for those patients with a
cochlear implant than those with hearing aids, but not always. The schedule for these
appointments is made on an individual basis because some children need more frequent changes
in device programming than others. If hearing aid molds need to be polished or re-made as
the child grows, this will be performed per clinic routine. If cochlear implant software or
hardware needs to be updated as new technology emerges, this too will occur per clinic
routine. Thus, all patients will be receiving the highest level of care according to current
standards. Lost or damaged equipment will be replaced.

As well, patients in all three groups will undergo thorough counseling about hearing
loss,and communication strategies. Contact with the child's teachers, therapists, and
caregivers will be made in an effort to organize a comprehensive strategy of regular
communication therapy. As is our routine, every patient will be offered the opportunity to
have supplementary weekly auditory therapy sessions with one of the speech pathologists that
are part of our cochlear implant team or through one of our satellite speech pathology
clinics. Our speech pathologists can provide auditory-verbal therapy (AVT), although they
typically modify the therapy structure to meet the needs of the individual child. Just as
with the audiology services, speech pathology services will be of the highest level and
quality for children in all groups. However, it should be noted that many families chose not
to obtain speech therapy services through our program. Instead, as a matter of convenience,
most families choose to have therapy only in their home through free/low cost Early
Childhood Intervention (ECI) services or their local school district.

The amount of time the hearing aids or cochlear implant are used and the amount and quality
of therapy will be assessed by regular phone calls. Every three months the study coordinator
will call the parents/caregiver and ask four questions:

- Have there been any complications of the hearing aids or cochlear implant in the last
three months (i.e. ear infections, ear drainage, meningitis), and if so, what therapy
was needed for the complication?

- How many hours per day are the hearing aids or cochlear implant are left on the child?

- How many hours per week is the child of communication therapy (defined as auditory,
speech, and language therapies) is the child receiving?

- How many hours per week of non-communication therapy (defined as physical,
occupational, and cognitive therapies) is the child receiving?

These data will be recorded in the database. The reasons for asking these questions are to
identify adverse events related to the interventions and to help identify reasons why one
intervention may work better or worse than the other. For example, decreased benefit might
be expected if a child treated with hearing aids continuously gets chronic ear drainage that
plugs the hearing aids so badly they have to be left off most of the time or if a child
treated with a cochlear implant gets meningitis. Alternatively, if receiving a cochlear
implant increases the enthusiasm of the parents and they participate in more therapy, there
may be increased benefit.

We will also be asking participants if they are willing to be contacted regarding future
research studies that may be of interest to them.

Inclusion Criteria:

Meet audiometric criteria for cochlear implantation

Age <3 by the time of initiation of treatment

Ability to return for follow-up evaluations at the one and two year time points

Exclusion Criteria:

Evidence of a progressive deteriorating medical condition that may lead to child's death
during the time frame of the study

Medical contraindication to cochlear implantation

Significant visual loss

Autism spectrum disorder