Key result
Bretylium tosylate increased the ventricular arrhythmia threshold during hypothermia in dogs to 23.2 impulses compared to a decrease to 4.4 impulses in controls.
Why the study?
Does bretylium tosylate improve ventricular arrhythmia threshold in anesthetized hypothermic dogs?
Population
Anesthetized hypothermic dogs
Comparison
Bretylium tosylate 7.5 mg/kg administered prior… vs Control animals undergoing the same cooling…
Design
Preclinical
Follow-up
During cooling from 37 degrees C to 27 degrees C
Authors
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Animal data suggest bretylium potential in hypothermic arrhythmia prevention; leaves open translation to human care.
Does bretylium tosylate improve ventricular arrhythmia threshold in anesthetized hypothermic dogs?
Absolute Event Rate: 23.2% vs 4.4%
Bretylium tosylate protects against electrically induced cardiac arrhythmias during hypothermia in dogs, likely through direct electrophysiologic effects rather than catecholamine modification.
Orts et al. (1992) studied Electrically induced cardiac arrhythmias during hypothermia. Bretylium tosylate vs. Control was evaluated on Ventricular arrhythmia threshold (VAT). Bretylium tosylate increased the ventricular arrhythmia threshold during hypothermia in dogs to 23.2 impulses compared to a decrease to 4.4 impulses in controls.
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