COMPARISON OF ABR AMPLITUDES WITH TIPTRODE AND MASTOID ELECTRODES

ABR evaluations were completed for 36 adults (18 males, 18 females) having normal hearing sensitivity and for 91 adult patients having vagrious degrees of a sesorineural hearing loss. Amplitudes of waves I and V were caompared for ear canal (TIPtrode) electrode and mastoid electrod receordings. Interpeak intervals (1-111, 111-V, and 1-V) were determined and upper 95% confidence limits defined for normative data. In general, amplitude of wave I was larger when TIPtrodes were used. Wave V amplitude was nearly identical for the two electrodes. Wave I was identified more frequently for TIPtrode than for mastoid recordings of ABR wavefroms fro the sensorineural hearing loss subjects.