Ventricular parasystole following implantation of an electronic pacemaker unit.
نویسنده
چکیده
ince the introduction of electronic pacemakers, S a number of previously unencountered arrhythmias are now seen freq~ently.'.~ Among those more commonly observed is &cia1 ventricular parasystole which occurs when normal A-V conduction is resumed in patients with k e d rate pacemaker units.8 Spontaneous ventricular parasystole is occasionally encountered in patients with supraventricular mechanisms.' The subject of this report is a patient who demonstrated a spontaneously active left ventricular focus (ventricular parasystole) after insertion of a permanent transvenous demand pacemaker unit.
منابع مشابه
Mechanisms of Intermittent Ventricular Bigeminy
In a previous report dealing with intermittent ventricular bigeminy due to ventricular premature systoles with fixed coupling in the presence of a grossly irregular dominant pacemaker, it was shown that the appearance and disappearance of the ectopic beats were dependent upon the length of the ventricular cycle ("rule of bigeminy"). In the present report, dealing with ventricular premature syst...
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A model of extended ventricular parasystole proposed by Moe et al. (1977) was formulated as a system of nonlinear difference equations by using the phase response curve of myocardial pacemakers. A number of ECG patterns of ventricular arrhythmia such as bigeminy, trigeminy etc. were explained from the property of periodic solutions of the equation. Characteristic properties of special kinds of ...
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Four examples of spontaneous and six of artificial ventricular parasystole exhibiting fixed coupling of the premature beats were presented. In five cases, one of the pacemakers was located in the S-A node, in four in the A-V junction, and in one at first in the A-V junction and later in the ventricles. The material was divided according to the presence either of mutual protection of the two pac...
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عنوان ژورنال:
- Chest
دوره 57 2 شماره
صفحات -
تاریخ انتشار 1970