The simultaneous use of electrocochleogram, brainstem auditory evoked potential and facial muscle EMG in cerebellopontine angle tumor removal.

J. C. Hsu, T. N. Lui, C. L. Yu, Y. C. Chen, C. N. Chang, P. P. Tan

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In six cases of acoustic neurilemmoma, electrocochleogram (ECOchG), brainstem auditory evoked potentials (BAEP) and facial muscle electromyograms (EMG) were recorded to monitor facial nerve and brainstem function. Under isoflurane and nitrous oxide anesthesia, we recorded ECOchG from the tympanic membrane, BAEP from the scalp needle, and facial muscle EMG from the mentalis muscle. During surgery, the body temperature was kept above 36.5 degrees C, and PaCO2 above 30 mmHg. In all cases, the peak N1 of ECOchG and wave I of BAEP had identical latencies throughout the monitoring period. The response was faster and the amplitude was higher in the ECOchG recordings. For calculation of the I-III or I-V interpeak latency of BAEP, the wave I of BAEP could be confirmed more quickly and precisely by the peak N1 of ECOchG. During tumor removal, the embedded facial nerve pathway in the tumor was identified by electric stimulation of the intracranial facial nerve, followed by evoked facial muscle EMG. Facial nerve function was confirmed by nerve traction or direct electric stimulation after total removal of the tumor. No facial palsy or other neurologic sequelae was found after the operations.

Original languageEnglish
Pages (from-to)580-584
Number of pages5
JournalJournal of the Formosan Medical Association = Taiwan yi zhi
Volume91
Issue number6
Publication statusPublished - Jun 1992
Externally publishedYes

    Fingerprint

ASJC Scopus subject areas

  • Medicine(all)

Cite this