Evaluation of hearing in middle-aged patients with diabetes mellitus type 2
- 1 Physical Medicine and Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran
- 2 Faculty of Rehabilitation Sciences, Tehran University of Medical Sciences, Tehran, Iran
- 3 Faculty of Rehabilitation Sciences, Tehran University of Medical Sciences, Tehran, Iran
- 4 Physical Medicine and Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran
Abstract
Introduction: Involvement of auditory pathway is one of the examples of central neuropathy in diabetics. The purpose of this study is to compare the auditory function of patients with type 2 diabetes mellitus with healthy subjects. Methodology: 30 diabetic and 30 healthy subjects participated in this study. For all participants conventional pure-tone audiometry (PTA) and Auditory Brainstem Evoked Responses (ABER) study were performed. Results: In PTA Hearing threshold only at 2, 4, 8 KHz frequencies were significantly higher than healthy subjects but were in normal range in patients with diabetes. ABER revealed that absolute latencies of waves I , III, V and inter wave latencies of III-V, I-V, I-III were significantly prolonged in diabetics. Conclusion: In this study, 50% of diabetic patients had hearing defects in ABER test despite normal hearing threshold and good meta-bolic control. Prolonged inter wave latencies of I-III, III-V, I-V explains retrocochlear and brain stem in volvement.
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