The Prevalence of Hearing Loss Among Children With Congenital Hypothyroidism

Study Overview
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Brief Summary
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Congenital hypothyroidism (CH) occurs in 1:4000 live births. Neurological disturbances like speech delay, motor delay and lower IQ were reported in children with CH. Evidence from animal experiments indicate that CH is associated with high frequency of deafness. Morphological changes of the external and internal cholera hairs were reported in mutagenic mice with CH. Anatomical changes of the internal ear and low hearing threshold were reported in mice bearing Dual oxidase 2 (Duox2) gene mutations, which is responsible of oxidation of iodide. Knockout of Pax8 gene in mice resulted in both agenesis of thyroid gland and deafness. Early L-thyroxin therapy prevented the development of deafness in those mice. The expression of thyroid receptor α (TRα) in the external and internal cholera hairs in mice indicates that the thyroid hormones have an important role in the development of the internal ear. The etiology of deafness in human is both genetic and environmental. The prevalence of deafness in live births is 1:1000 and among them 60% is genetic. Connexin 26 gene mutations are the most common cause of inherited deafness and account for about 40% of the genetic cases. In two conditions in human the coexistence of hypothyroidism and deafness were reported; Pendred syndrome and thyroid hormone resistance syndrome. The prevalence of hearing loss in human with CH was explored in only few studies and the results are contrary. The aim of the current study is to study the prevalence of hearing loss among children with CH and to compare the clinical, biochemical and genetic characteristics between subjects with hearing loss to those without hearing loss.

Conditions
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Congenital Hypothyroidism, Hearing Loss

Intervention / Treatment
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* Other: Audiometry


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients with congenital hypothyroidism aged 2-30 years Exclusion Criteria: Hearing defects in the family Intrauterine infections Perinatal hypoxia Long term therapy with aminoglycosides Acoustic trauma in the past

Ages Eligible for Study
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Minimum Age: 2 Years
Maximum Age: 30 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Congenital hypothyroidism<br>Patient which were diagnosed with congenital hypothyroidism | Other: Audiometry<br>* Audiometry<br>|
| Controls<br>Patients without any endocrine or hearing problems | Other: Audiometry<br>* Audiometry<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Hearing Level |  | 2 years | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Congenital hypothyroidism(CH), Hearing loss among children with CH