Auditory brainstem evoked responses in healthy north Indians.

Auditory brainstem evoked potential responses (ABR) were recorded from CZ-A1 and A2 scalp regions in 132 healthy normal subjects in four age groups (in yr; less than 15, 16-25, 26-45 and greater than 46). The normative data for absolute, interpeak latencies and amplitude of waves V and I in each group are being reported. A mean value of 2.09, 1.85 and 3.97 msec for IPLs I-III, III-V and I-V respectively is worked out representing a normal baseline, irrespective of age. As significant sex related differences are seen in IPLs, two separate values for male and females are given along with 99 per cent tolerance limit. The values of IPLs for males are 2.13 (2.58 TL) for I-III, 1.88 (2.30 TL) for III-V, 4.03 (4.48 TL) for I-V and for females 2.05 (2.44 TL) for I-III, 1.80 (2.25 TL) for III-V, 3.89 (4.42 TL) for I-V in msec. These values in Indian subjects are comparable to those reported in the West.