extrastimulus

extrastimulus
ex·tra·stim·u·lus (ek″strə-stimґu-ləs) a premature stimulus delivered, singly or in a group of several stimuli, at precise intervals during a tachyarrhythmia in order to terminate it. Delivery of stimuli may be synchronous or asynchronous with the arrhythmia; if synchronous, delivery may be preprogrammed or adaptive to the tachycardia cycle length. Premature stimuli may also be delivered during cardiac electrophysiologic testing to initiate supraventricular or ventricular tachycardia.

Programmed extrastimulus used to initiate ventricular tachycardia. The last two ventricular-paced beats at a cycle length of 600 milliseconds are shown. Two premature stimuli (S1, S2) initiate a sustained monomorphic tachycardia at a cycle length of 300 milliseconds.


Medical dictionary. 2011.

Look at other dictionaries:

  • Tachysystolie auriculaire — La tachysystolie auriculaire, encore appelée tachysystolie ou tachycardie atriale, est un trouble du rythme supra ventriculaire différent du flutter et de la fibrillation auriculaire. Sommaire 1 Physiopathologie 2 Clinique 3 Aspect ECG …   Wikipédia en Français

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