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Bupivacaine hastens the ischemia-induced decrease of the electrical ventricular fibrillation threshold

M Freysz1, Q Timour, L Bertrix

  • 1Department of Medical Pharmacology, Claude Bernard University, Lyon, France.

Anesthesia and Analgesia
|April 1, 1995
PubMed
Summary
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Myocardial ischemia sensitizes bupivacaine cardiotoxicity, increasing ventricular fibrillation risk. This study found bupivacaine worsens ischemia-induced conduction delays, necessitating caution during procedures involving both factors.

Area of Science:

  • Cardiology
  • Anesthesiology
  • Pharmacology

Background:

  • Myocardial ischemia can potentiate local anesthetic cardiotoxicity.
  • Bupivacaine is a common local anesthetic with known cardiac risks.

Purpose of the Study:

  • To investigate how myocardial ischemia sensitizes the cardiotoxic effects of bupivacaine.
  • To elucidate the mechanism behind bupivacaine's increased propensity for ventricular fibrillation during ischemia.

Main Methods:

  • Anesthetized pigs underwent electrophysiological studies measuring fibrillation threshold.
  • Myocardial ischemia was induced via left anterior descending coronary artery occlusion.
  • Bupivacaine was administered, and its effects were compared with and without ischemia.

Related Experiment Videos

Main Results:

  • Bupivacaine alone increased the fibrillation threshold.
  • During ischemia, bupivacaine lowered the fibrillation threshold and hastened spontaneous fibrillation.
  • Bupivacaine and ischemia combined significantly prolonged conduction time in the ischemic area.

Conclusions:

  • Bupivacaine should be used cautiously in patients with myocardial ischemia.
  • Tachycardia exacerbates bupivacaine's effects on conduction during ischemia.