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Anesth Analg 1985; 64:811-815
© 1985 International Anesthesia Research Society
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Respiratory Sinus Arrhythmia during Recovery from Isoflurane—Nitrous Oxide Anesthesia

Yoel Donchin, MD, James M. Feld, MD, and Stephen W. Porges, PhD

The Department of Psychology, University of Illinois at Urbana-Champaign, Champaign, Illinois; and the Department of Anesthesia, Michael Reese Medical Center, Chicago, Illinois.

Abstract

Heart rate and respiratory patterns were monitored in ten ambulatory female patients undergoing elective laparoscopy. The patients were anesthetized with isoflurane-nitrous oxide. An index of cardiac vagal tone determined from the heart rate pattern by quantifying the amplitude of respiratory sinus arrhythmia was elevated over four 10-min periods: before induction of anesthesia; during maintenance of anesthesia; upon arrival in the recovery room; and 20–30 min later when the patient was fully conscious. All ten patients' vagal tones were lowest during maintenance of anesthesia. During the recovery periods vagal tone increased and approached the conscious level. On-line analysis of respiratory sinus arrhythmia may provide a physiological index of the level of anesthesia and the rate of recovery

Key Words: HEART, arrhythmias—Sinus. • ANESTHETICS, volatile—isoflurane.




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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 © 1985 by the International Anesthesia Research Society.