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 involvement.
Highlights
Involvement of auditory pathway is one of the examples of central neuropathy in diabetics
Patients with type 2 diabetes, in conventional pure-tone audiometry (PTA) had normal hearing thresholds being consistent with theresults of the findings of Dalton et al [3]
Díaz de LeónMorales LV et al mentioned that the hearing threshold of people with type 2 diabetes at 8000 Hz was higher than healthy people [7]
Summary
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. 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 disorders are more frequent in diabetic patients affected with other micro vascular complications such as retinopathy, nephropathy, and peripheral sensori-motor polyneuropathy [9]. An attempt was made to relate abnormal brain stem evoked responses with sex, duration of disease, and peripheral sensori-motor polyneuropathy
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