Simultaneous measurement of electrocochleography and cochlear blood flow during cochlear hypoxia in rabbits

Erdem Yavuz, Krzysztof Morawski, Fred F. Telischi, Özcan Özdamar, Rafael E. Delgado, Fabrice Manns, Jean Marie Parel

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

In this study, a new monitoring system is developed to measure cochlear blood flow (CBF) and electrocochleography (ECochG) during transient ischemic episodes of the cochlea. A newly designed otic probe was used for the simultaneous recordings of laser-Doppler CBF and ECochG directly from the round window (RW). The probe enabled the recording of high amplitude compound action potentials (CAP) and cochlear microphonics (CM) with few averages. Experiments were conducted on rabbits to generate episodes of cochlear ischemia by using timed compressions of the internal auditory artery (IAA). The computer monitoring system extracted and measured CAP and CM components from ECochG in real-time. Results indicate that CM and CAP generally followed CBF during compressions and releases of IAA. Both CBF values and CAP amplitudes showed an overshoot following the reperfusion. CAP amplitude measures were found to be very sensitive to ischemia showing very rapid amplitude, latency and morphological changes. CM amplitude decreased more slowly than the CAP and CBF. Simultaneous recordings of CBF and ECochG using the otic probe provide a valuable neuromonitoring tool to investigate the dynamic behavior of the cochlea during ischemia.

Original languageEnglish (US)
Pages (from-to)55-64
Number of pages10
JournalJournal of Neuroscience Methods
Volume147
Issue number1
DOIs
StatePublished - Aug 30 2005

Keywords

  • Cochlear blood flow
  • Compound action potential
  • Electrocochleography
  • Hypoxia
  • Ischemia
  • Neuromonitoring

ASJC Scopus subject areas

  • Neuroscience(all)

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