Haemodynamic differences between pancuronium and vecuronium in an experimental pig model

Area of Science:

• Anesthesiology
• Cardiovascular Physiology
• Pharmacology

Background:

• Neuromuscular blocking agents are crucial in anesthesia.
• Pancuronium and vecuronium are commonly used, but their comparative cardiovascular effects in pigs require clarification.

Purpose of the Study:

• To compare baseline cardiovascular function in anesthetized pigs using pancuronium versus vecuronium.
• To assess the hemodynamic impact of different vecuronium dosages.

Main Methods:

• Retrospective, non-randomized study of 116 Norwegian Land Race pigs.
• Animals received standardized premedication and anesthesia (ketamine, diazepam, atropine, isoflurane, pentobarbital, fentanyl, midazolam, N2O).
• Groups received pancuronium or low/high-dose vecuronium as neuromuscular blockers.

Main Results:

• Most cardiovascular parameters showed no significant differences between pancuronium and vecuronium groups.
• A significant difference in heart rate was observed (p=0.036).
• Pancuronium showed lower dromotropy (increased PR-interval) and increased left ventricular compliance compared to vecuronium.

Conclusions:

• Minor hemodynamic differences exist between pancuronium and vecuronium in fentanyl-pentobarbital-midazolam-N2O anesthetized pigs.
• Increasing doses of vecuronium have minimal impact on hemodynamics.
• Both agents are comparable for cardiac and hemodynamic performance in experimental pig studies.