PMID: 679762Aug 1, 1978

Procainamide-induced left anterior hemiblock of the 2:1 type (pseudoelectrical alternans)

H O KleinE Kaplinsky


A selective defect in cardiac conduction in the anterior division of the left bundle branch was induced in a patient by therapy with procainamide hydrochloride. The defect in conduction, when intermittent, resulted in 2:1 Wencklebach sequences and produced a pattern similar to classic electrical alternans. The prognosis in drug-induced alternans is good, and it is important to differentiate it from true electrical alternans.


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May 6, 1974·The American Journal of Cardiology·M E JosephsonA N Damato
Sep 1, 1971·American Heart Journal·M Cerqueira-Gomes, A Vasconcelos Teixeira
Jul 1, 1969·Circulation·M B RosenbaumJ O Lazzari
Feb 1, 1963·Circulation·D LITTMANN


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