Mechanism of supraventricular parasystole

Circulation
S KinoshitaY Tanabe

Abstract

Two patients with supraventricular parasystole (one atrioventricular and one auricular) are reported. In both patients, reentrant extrasystoles appeared to occur as the result of Mobitz type I second-degree entrance block. We believe that when a sinus impulse fell soon after the absolute refractory period of the pathway containing the parasytolic focus, it reached and discharged the focus after marked delay, and thereafter became a reentrant extrasystole. In interectopic intervals containing more than one sinus beat, the number of intervening sinus beats was always even, suggesting the presence of concealed reentrant extrasystolic bigeminy. The observations in the present report and in our previous patients with ventricular parasystole strongly suggest that most cases of parasystole, whether ventricular or supraventricular, or whether intermittent or "continuous," may be governed by second-degree entrance block.

Citations

Feb 25, 2010·Journal of Cardiovascular Medicine·Shinji KinoshitaHiroshi Yoshida
Oct 12, 2010·Journal of Cardiovascular Medicine·Shinji Kinoshita, Takakazu Katoh
Apr 1, 1984·Journal of Electrocardiology·S KinoshitaT Yasukouchi
Oct 1, 1989·Journal of Electrocardiology·S KinoshitaY Tanabe
May 15, 1984·The American Journal of Cardiology·S KinoshitaK Nakagawa

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