Abstract:In a recent electrocardiographic investigation (Berliner and Lewithin, 1945) the aberration of the ventricular complex of auricular premature systoles (APS)* was studied. Variations in amplitude, duration, direction, and configuration were found and described in detail. In the course of that investigation, a new feature of the APS, shortening of the electrical systole (Q-T interval), was discovered. This subject has since been studied by careful measurements which are reported in the present paper.
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