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Related Experiment Videos

Does desflurane modify circulatory responses to stimulation in humans?

N Yasuda1, R B Weiskopf, M K Cahalan

  • 1Department of Anesthesia, University of California, San Francisco 94143-0464.

Anesthesia and Analgesia
|August 1, 1991
PubMed
Summary

Higher doses of desflurane anesthesia (1.66 MAC) attenuated cardiovascular responses to stimulation. Lower doses (0.83 and 1.24 MAC) did not prevent these responses, indicating desflurane

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Area of Science:

  • Anesthesiology
  • Cardiovascular Physiology
  • Pharmacology

Background:

  • Cardiovascular responses to surgical stimuli are common.
  • Understanding anesthetic effects on these responses is crucial for patient safety.

Purpose of the Study:

  • To investigate the effects of desflurane, with or without nitrous oxide, on cardiovascular responses to tetanic nerve stimulation.
  • To determine the minimum alveolar concentration (MAC) of desflurane required to attenuate these responses.

Main Methods:

  • Six healthy male volunteers were studied.
  • Cardiovascular parameters (cardiac output, heart rate, blood pressure) were measured.
  • Tetanic electrical stimulation of the ulnar nerve was applied at varying MAC levels of desflurane.

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Main Results:

  • Desflurane at 0.83 and 1.24 MAC did not prevent increases in cardiac output, heart rate, and blood pressure during stimulation.
  • At 1.66 MAC, desflurane attenuated heart rate and blood pressure responses.
  • Nitrous oxide addition reduced heart rate and cardiac output responses but not blood pressure responses.

Conclusions:

  • 0.83 and 1.24 MAC desflurane are insufficient to abolish cardiovascular responses to stimulation.
  • 1.66 MAC desflurane attenuates some cardiovascular responses.
  • Further research may be needed to optimize anesthetic depth for blunting sympathetic responses.