What is extrasystole?

Extrasystole is a premature contraction of the heart originating at a site other than the usual; it may arise from the atrium, the atrioventricular node, or the ventricle.
atrial e. Extrasystole due to irritability of the atria; the early contractions emanate from an impulse in the atria outside the sinoatrial node.
atrioventricular nodal e. Extrasystole emanating from the atrioventricular node
and leading to a simultaneous or near simultaneous contraction of atria and ventricles.
A-V nodal e. See atrioventricular nodal extrasystole.
interpolated e. A ventricular extrasystole which, instead of being followed by a compensatory pause, is sandwiched between two consecutive sinus cycles.
nodal e. See atrioventricular nodal extrasystole.
supraventricular e. An extrasystole emanating from a center above the ventricles, i.e., atrium or atrioventricular node.
ventricular e. A premature contraction of the ventricles.

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