Effects of hypothermia on brainstem auditory evoked potentials in humans

Omkar N. Markand, Byung I. Lee, Carroll Warren, Robert K. Stoelting, Robert D. King, John W. Brown, Yousuf Mahomed

Research output: Contribution to journalArticle

52 Scopus citations

Abstract

Ten adult patients who underwent open heart surgery under induced hypothermia had brainstem auditory evoked potentials (BAEPs) recorded at 1°- to 2°C-steps as body temperature was lowered from 36°C to 20°C to determine temperature-dependent changes. Hypothermia produced increased latencies of BAEP waves I, III, and V; the prolongation was more severe for the later components with the results that interpeak latencies I-III, III-V, and I-V were also prolonged. The temperature-latency relationship was nonlinear and best expressed by exponential curve. The latencies of waves I, III, V and the interpeak latency I-V increased roughly 7% for each 1°C drop; they doubled at a temperature around 26°C. The amplitude of the BAEP components had a quasiparabolic relationship to temperature; the amplitude rose with hypothermia to 28° or 27°C, but decreased linearly with further cooling. All BAEP components were present at temperatures above 23°C and absent below 20°C. With rewarming, the changes reversed and BAEPs returned to initial prehypothermia status.

Original languageEnglish (US)
Pages (from-to)507-513
Number of pages7
JournalAnnals of neurology
Volume22
Issue number4
DOIs
StatePublished - Oct 1987

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology

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