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  • Title: Modification of ventricular tachycardia by procainamide in patients with coronary artery disease.
    Author: Engel TR, Meister SG, Luck JC.
    Journal: Am J Cardiol; 1980 Dec 01; 46(6):1033-8. PubMed ID: 7446417.
    Abstract:
    Fifteen consecutive patients with coronary artery disease had rapid (158 to 272 beats/min) and sustained ventricular tachycardia induced by the extrastimulus technique, and received procainamide infusion. Before the study, all but one patient had severe symptoms with tachycardia, and six had survived apparent sudden death. Procainamide consistently slowed ventricular tachycardia. However, in traditional doses (1 g infusion, plasma concentration greater than 4 micrograms/ml), it prevented induction of ventricular tachycardia in only 2 of the 15 patients. Induction of ventricular tachycardia was facilitated by procainamide in 10 patients. Larger doses of procainamide (plasma concentration 20.2 micrograms/ml +/- 9.7 [mean +/- standard deviation]) prevented induction of ventricular tachycardia in one of eight patients. Rapid ventricular rates (more than 210 beats/min) that were not slowed (by 50 percent or more) after a 1 g infusion of the drug predicted failure of procainamide to prevent ventricular tachycardia. Therefore, procainamide slowed but did not prevent induced ventricular tachycardia in most of these patients with coronary artery disease at risk of sudden death.
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