SIMULTANEOUS ABR AND ELECTROCOCHLEOGRAM (ECoG) RECORDING DURING CEREBELLOPONTINE ANGLE SURGERY

Abstract

Auditory evoked brain stem response (ABR) and electrocochleogram (ECoG) were simultaneously recorded during six cerebellopontine angle surgeries (three acoustic neuromas and three microvascular decompressions for hemifacial spasm or trigeminal neuralgia).
This study indicated that ECoG is more useful than ABR in identifying the wave I and in detecting the subtle latency change of the wave I during the operative manipulations. It is suggested that simultaneous recording of ABR and ECoG can be more advantageous than merely relying an ABR in the intraoperative monitoring of the auditory function during the cerebellopontine angle surgery.