Intraoperative monitoring of hearing during cerebellopontine angle tumor surgery using transtympanic electrocochleography

Krzysztof F. Morawski, Kazimierz Niemczyk, Jorge Bohorquez, Andrzej Marchel, Rafael E. Delgado, Ozcan Ozdamar, Fred F. Telischi

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


OBJECTIVE: To investigate the use of transtympanic electrocochleography (TT-ECochG) analyzed on-line by a detector strategy software that made possible automatic extraction of TT-ECochG components intraoperatively in real-time domain. PATIENTS: Fifteen patients with cerebellopontine angle tumor among 50 patients were included in this study. INTERVENTION: All subjects were operated on via middle fossa or retrosigmoid approach. Pure-tone average (PTA) was measured at 0.5, 1.0, and 2.0 kHz, and calculations were performed before and after surgery. Auditory function was monitored intraoperatively via TT-ECochG, and analyzed data were displayed on-line. MAIN OUTCOME MEASURES: TT-ECochG changes in morphology were described. Postoperative PTA elevation level correlated with TT-ECochG morphology changes occurring intraoperatively. RESULTS: Analyzed on-line, TT-ECochG data were displayed as first negative peak of compound action potential amplitude and latency in time domain every 3 to 5 seconds. A good correlation between postoperative PTA elevation and TT-ECochG morphology changes was showed (Spearman rank test, R = +0.93; t(N-2) = 9.00; p < 0.0001). CONCLUSION: TT-EcochG seemed to effectively mirror even minimal changes in auditory function during intraoperative monitoring in real-time domain. Developed strategy of on-line analysis makes the intraoperative hearing status assessment faster and easier.

Original languageEnglish (US)
Pages (from-to)541-545
Number of pages5
JournalOtology and Neurotology
Issue number4
StatePublished - Jun 2007


  • Cerebellopontine angle tumor surgery
  • Electrocochleography
  • Hearing preservation
  • Intraoperative monitoring of hearing

ASJC Scopus subject areas

  • Otorhinolaryngology
  • Neuroscience(all)


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