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The hearing system under thyroid hypofunction
S Khechinaschvili1, D Metreveli, N Svanidze
1Otorhinolaryngological Clinic, State Medical University, Tbilisi, Georgia.
Georgian Medical News
|May 3, 2007
Summary
Hypothyroidism frequently causes sensorineural hearing loss and central auditory processing disorders. Hormonal therapy shows limited effectiveness in improving these auditory issues in patients with thyroid hypofunction.
Area of Science:
- Otolaryngology
- Endocrinology
- Audiology
Background:
- Hypothyroidism can affect various bodily systems, including the auditory system.
- Understanding the auditory impact of thyroid hypofunction is crucial for comprehensive patient care.
Purpose of the Study:
- To investigate auditory system function in patients with thyroid hypofunction.
- To assess peripheral and central hearing disorders associated with hypothyroidism.
Main Methods:
- Pure tone audiometry (PTA) to determine hearing thresholds.
- Brief tone audiometry (BTA) to evaluate temporal summation.
- Evoked otoacoustic emissions (EOAEs), auditory brainstem responses (ABRs), and acoustic reflexes (ARs) for objective assessments.
Main Results:
- Sensorineural hearing loss detected in 74.0% of patients via PTA.
- Disturbances in cochlear receptor temporal summation found in 26.0% using BTA.
- ABRs and ARs indicated central hearing disorders in 30.0% and 26.0% respectively.
- EOAEs and BTA identified abnormalities even when PTA thresholds were normal.
Conclusions:
- Hypothyroidism is associated with significant peripheral and central auditory impairments.
- Hormonal therapy demonstrates minimal efficacy in ameliorating these auditory deficits.
- Comprehensive audiological evaluation is recommended for patients with thyroid hypofunction.
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