Hearing impairment is a late complication of diabetes mellitus (DM). The present study was needed considering high incidence of diabetes in Indian population and its complications in the form of hearing loss. Delay in the neural conductance along the auditory pathway due to DM was assessed by means of Auditory Brainstem Response (ABR). The sample comprised of three groups, first group comprising of normal healthy 16 ears, the second group with type 1 DM and the third group with type 2 DM comprising of 16 ears each, respectively. ABR recordings showed that absolute latencies of waves I, III, and V that were significantly prolonged in the diabetic group compared to control (p<0.05). However, when two diabetic groups were compared with each other, the difference between latencies of waves I, V in the two diabetic groups was statistically significant (p<0.05). With increase of stimulus presentation rate from 20/s to 72/s in type 2 DM, there was a significant delay in absolute latencies of wave I, III, V as well as interpeak latencies of waves III-V, and I-V. There is a delay in neural conductance due to DM which can be measured using ABR even before manifestation of actual hearing loss.The prolongation of latency of ABR in diabetic patients should raise concern about damage to the auditory nerve. A close follow up will be required in these patients.

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