Parasystole

Parasystole is a kind of arrhythmia caused by the presence and function of a secondary pacemaker in the heart, which works in parallel with the SA node. Parasystolic pacemakers are protected from depolarization by the SA node by some kind of entrance block. This block can be complete or incomplete. Parasystolic pacemakers can exist in both the atr...
Found on http://en.wikipedia.org/wiki/Parasystole

parasystole

(par″ә-sis┬┤tә-le) a cardiac arrhythmia attributed to the interaction of two foci independently initiating cardiac impulses at different rates; it cannot be discharged by impulses of the dominant rhythm but it may be modulated by electrotonic influences. The two independent rhythms coexist but not...
Found on http://www.encyclo.co.uk/local/21001

parasystole

A cardiac arrhythmia caused by the interaction of two foci independently initiating cardiac impulses at different rates. Generally one of the foci is the sinoatrial node (the normal pacemaker) and the ectopic focus is usually in the ventricle, but can occur in the sinus and av nodes, atrium and ventricle, and av junction. Each focus - and thus each...
Found on http://www.encyclo.co.uk/local/20973

parasystole

Type: Term Pronunciation: par′ă-sis′tō-lē Definitions: 1. A second automatic rhythm existing simultaneously with normal sinus or other dominant rhythm, the parasystolic center being protected from the dominant rhythm's impulses so that its basic rhythm is undisturbed, although it may be manifest in the ECG only at various...
Found on http://www.medilexicon.com/medicaldictionary.php?t=65315
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