Key result
Ethacizin reduced arrhythmias in dogs post-coronary ligation but increased QRS duration and R-on-T beats, resulting in sudden death in 33.3% of dogs compared to 0% with ethmozine or quinidine.
Population
Dogs 24 hours after ligation of the left anterior descending coronary artery, and canine cardiac tissues
Comparison
Ethacizin (in vivo, and in vitro at 300 ng/mL) vs Ethmozine (n=6) and quinidine (n=6)
Design
Preclinical
Authors
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Raises safety concerns for ethacizin despite antiarrhythmic effects in dogs; leaves open its viability for human arrhythmia management.
Absolute Event Rate: 33.3% vs 0%
While ethacizin exhibits antiarrhythmic properties by reducing impulse initiation and conduction, it carries significant proarrhythmic and toxic risks, including increased QRS duration and sudden death.
Dangman et al. (1990) studied Arrhythmias. Ethacizin vs. Ethmozine and quinidine was evaluated on Sudden death. Ethacizin reduced arrhythmias in dogs post-coronary ligation but increased QRS duration and R-on-T beats, resulting in sudden death in 33.3% of dogs compared to 0% with ethmozine or quinidine.