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Related Experiment Videos

Site(s) mediating sympathetic activation with desflurane

M Muzi1, T J Ebert, W G Hope

  • 1Department of Anesthesiology, Medical College of Wisconsin, Milwaukee, USA.

Anesthesiology
|October 1, 1996
PubMed
Summary

Desflurane activates sympathetic responses via upper airway and lung receptors, independent of systemic effects. Lidocaine did not attenuate these desflurane-induced neurocirculatory changes.

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Area of Science:

  • Anesthesiology
  • Neurophysiology

Background:

  • Desflurane's neurocirculatory activation mechanism requires precise identification of afferent pathways.
  • Understanding these pathways is crucial for safe anesthetic administration.

Purpose of the Study:

  • To delineate the specific afferent sites responsible for desflurane-induced neurocirculatory activation.
  • To investigate the role of upper airway and pulmonary receptors in this response.

Main Methods:

  • Three studies in healthy volunteers (aged 19-28) monitored cardiovascular and sympathetic responses.
  • Desflurane was selectively delivered to upper/lower airways or lungs using double-lumen tubes.
  • Lidocaine or placebo was administered to assess its effect on desflurane's neurocirculatory activation.

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Main Results:

  • Desflurane directed to the upper airway caused significant increases in heart rate, blood pressure, and sympathetic activity.
  • Delivery to the lungs induced even greater neurocirculatory responses, independent of systemic desflurane levels.
  • Lidocaine administration did not attenuate the observed desflurane-induced neurocirculatory activation.

Conclusions:

  • Both upper airway (laryngeal) and pulmonary sites initiate sympathetic activation during desflurane administration.
  • These responses are partly independent of systemic anesthetic concentrations.
  • The findings suggest direct airway mucosal irritation and distinct pulmonary reflexes contribute to desflurane's effects.