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European Heart Journal 1981 2(5):429-439;
Copyright © 1981 by the European Society of Cardiology.
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© 1981, by The European Society Of Cardiology

The effect of sinus rhythum on the periodicity and coupling interval of ventricular parasystolic rhythm

C. W. VELLANI* and A. MURRAY{dagger},

Departments of Medicine and Medical Physics and Engineering Royal Infirmary, Edinbirgh, Scotland

Received 9 December 1980; revised 26 May 1981; .

Dr Alan Murray, Regional Medical Physics Department, Freeman Hospital, Newcastle Upon Tyne NE7 7DN

Abstract

Ventricular parasystole was studied in three patients. Long periods of the ECG were analysed allowing features of the ectopic mechanism to be deduced.The ECGs were recorded on magnetic tape and analysed with the aid of special purpose and digital computers.Sinus rhythm was found to alter the periodicity of the ectopic rhythm and to adjust its phase relation–ship relative to sinus rhythm. These effects were more marked when the ectopic period was similar to the sinus period or its multiple. In one patient phase adjustment resulted in periods of bigeminy with fixed coupling.The adjustment of periodicity and phase probably results from subthreshold stimuli due to sinus rhythm modifying the function of spontaneous depolarization of the ectopic pacemaker.

Key Words: Parasystole • synchrony • bigeminy • fixed coupling


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