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Effect of flecainide acetate on prevention of electrical induction of ventricular tachycardia and occurrence of ischemic ventricular fibrillation during the early postmyocardial infarction period evaluation in a conscious canine model of sudden death



Effect of flecainide acetate on prevention of electrical induction of ventricular tachycardia and occurrence of ischemic ventricular fibrillation during the early postmyocardial infarction period evaluation in a conscious canine model of sudden death



Journal of the American College of Cardiology 9(2): 359-365



The antiarrhythmic and antifibrillatory effects of flecainide acetate during the early postinfarction period were evaluated in a conscious canine model of sudden cardiac death. Ventricular tachycardia remained inducible early after infarction in eight of nine dogs receiving an intravenous loading dose of flecainide (2.0 mg/kg body weight) and seven of eight dogs receiving saline vehicle. In both the drug and vehicle groups, there was no significant change in the ventricular refractory period or in the cycle length of the induced ventricular tachycardia. With a maintenance intravenous infusion of flecainide, 1.0 mg/kg per h for 4 hours, the subsequent occurrence of acute posterolateral ischemia resulted in the development of ventricular fibrillation and sudden death in seven of eight flecainide-treated and eight of eight vehicle-treated dogs. Seven additional postinfarction dogs with noninducible tachycardia during pretreatment programmed stimulation, and thereby considered to be at "low risk" for the development of ischemic ventricular fibrillation, were also given flecainide in an intravenous loading and maintenance dosing regimen. The subsequent occurrence of posterolateral ischemia resulted in the development of ventricular fibrillation in three of these seven dogs. These findings suggest that flecainide acetate may not possess pharmacologic properties useful in managing ventricular tachycardia or in preventing ischemic ventricular fibrillation in the presence of recent myocardial damage.

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Accession: 005239389

Download citation: RISBibTeXText

PMID: 3100599

DOI: 10.1016/s0735-1097(87)80389-3


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