Abstract

Observations were made on 17 patients with complete or incomplete atrioventricular block complicated by attacks of the Morgagni-Adams-Stokes syndrome. In ten cases the attacks were recorded electrocardiographically. In two patients an enhanced rate of auricular contraction was observed to occur before the attack. During the attacks, in which ventricular asystole lasting for 25 sec or more occurred, the auricular contraction rate was at first increased, and then decreased and arrhythmic. The Erlanger-Blackman phenomenon was found in six patients in which the automatism was initiated in the atrioventricular node.

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