Reperfusion ventricular arrhythmias during intracoronary thrombolysis.

While coronary reperfusion arrhythmias are well defined in animal models, their prevalence and predisposing factors are still uncertain during pharmacologic coronary reperfusion in patients with acute myocardial infarction. In 80 patients, who underwent this procedure and had a continuous electrocardiographic monitoring (associated with a Holter recording in 34), 6 patients developed ventricular fibrillation. Ventricular fibrillation was the terminal event in 2/19 non-reperfused patients. The other episodes of ventricular fibrillation (controlled with DC countershock) occurred within 5 minutes and 3 minutes after angiographic documentation of coronary reperfusion. Ventricular fibrillation was observed in 4/10 patients with a residual stenosis less than or equal to 80% but in no case among the 39 patients with a residual stenosis greater than 80% (P = 0.01). Holter recordings in 19 reperfused patients showed ventricular tachycardia or accelerated idioventricular rhythm at reperfusion in 8/10 patients with a coronary stenosis less than or equal to 80% and only in 3/9 with a higher degree stenosis (P less than 0.05). Reperfusion ventricular fibrillation was found to occur in 8.1% of patients. A residual stenosis of 80% or less was found to be a predisposing factor in the occurrence of ventricular fibrillation, ventricular tachycardia or accelerated idioventricular rhythm at reperfusion.