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Related Experiment Videos

Does isoflurane alter mesenteric venous capacitance in the intact rabbit?

J B McCallum1, T A Stekiel, Z J Bosnjak

  • 1Department of Anesthesiology, Medical College of Wisconsin, Milwaukee 53226.

Anesthesia and Analgesia
|May 1, 1993
PubMed
Summary

Inhaled isoflurane dilates mesenteric veins and impairs baroreceptor reflexes. Topical isoflurane dilates veins but does not affect reflex responses, suggesting central mechanisms for inhaled anesthetic effects.

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Area of Science:

  • Cardiovascular Physiology
  • Anesthesiology
  • Autonomic Nervous System Regulation

Background:

  • Volatile anesthetics impact cardiovascular function and barostatic reflexes.
  • Mesenteric venous capacitance vessels play a role in regulating blood pressure.
  • Understanding anesthetic effects on these systems is crucial for patient safety.

Purpose of the Study:

  • To investigate the effects of isoflurane on reflex regulation of mesenteric venous capacitance vessels.
  • To differentiate between systemic and local effects of isoflurane on these vessels.
  • To elucidate the mechanism by which isoflurane influences barostatic control.

Main Methods:

  • 31 chloralose-anesthetized rabbits were used.
  • Mesenteric vein diameter, intravenous pressure, and sympathetic nerve activity were monitored.

Related Experiment Videos

  • Isoflurane was administered via inhalation or topical superfusion, with baroreceptor reflexes activated by carotid occlusion or nerve stimulation.

    • Main Results:

    • Inhaled isoflurane dose-dependently reduced hemodynamic variables and sympathetic nerve activity.
    • Inhaled isoflurane (1.5%) abolished baroreceptor reflex responses in mesenteric veins and nerve activity.
    • Superfused isoflurane dilated baseline vein diameter but did not affect reflex responses or sympathetic nerve activity.

    Conclusions:

    • Isoflurane increases mesenteric venous capacitance and inhibits reflex venoconstriction.
    • Inhaled isoflurane attenuates baroreceptor reflex responses, likely via central or ganglionic inhibition.
    • The findings suggest a central mechanism for inhaled isoflurane's effects on barostatic control.