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Anesth Analg 1986; 65:475-480
© 1986 International Anesthesia Research Society
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Influence of Moderate Hypothermia on Posterior Tibial Nerve Somatosensory Evoked Potentials

Aart T. van Rheineck Leyssius, MD, Cor J. Kalkman, MD, and James G. Bovill, MD, FFARCSI

Received from the Department of Anesthesiology, University of Amsterdam, Academic Medical Centre, Amsterdam, and the Department of Anesthesiology, Academic Hospital, University of Leiden, Leiden, The Netherlands.

Abstract

Posterior tibial nerve somatosensory evoked potentials (PTN-SSEP) were recorded in eight patients during cardiac surgery with cardiopulmonary bypass and moderate hypothermia (25–28°C).There was no correlation between changes in amplitude and temperature; however, latencies of potentials recorded over the tibial nerve in the popliteal fossa, the lumbar spinal cord, and the cortex increased linearly as temperature decreased. Latency changes correlated well with nasopharyngeal temperature, but only poorly with rectal and lower limb muscle temperatures. During perioperative monitoring of spinal cord function by means of PTN-SSEP, an increase of the first positive cortical peak (P1) greater than 3 msec is considered an indication for intervention. In this study PI prolonged 1.15 msec/°C (r = 0.89, P < 0.001). This implies that a temperature decrease of 2–3°C may prolong P1 latency by more than 3 msec.

Key Words: BRAIN—evoked potentials • HYPOTHERMIA—evoked potentials




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Lippincott, Williams & Wilkins Anesthesia & Analgesia® is published for the International Anesthesia Research Society® by Lippincott Williams & Wilkins with the assistance of Stanford University Libraries' HighWire Press®. Copyright 2006 by the International Anesthesia Research Society. Online ISSN: 1526-7598   Print ISSN: 0003-2999 HighWire Press
Copyright © 1986 by the International Anesthesia Research Society.