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A premature contraction of the heart, resulting in momentary cardiac arrhythmia.

ex′tra·sys·tol′ic (-sĭ-stŏl′ĭk) adj.
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Adj.1.extrasystolic - of or relating to or happening during an extrasystole
References in periodicals archive ?
The complex cardiovascular pathology included past paroxystic atrial fibrillation, ventricular extrasystolic arrhythmia, aortic atherosclerosis, NYHA class II heart failure, grade III tricuspid regurgitation, grade I mitral regurgitation, low pulmonary hypertension, previously treated with propafenone/ amiodarone and acetylsalicylic acid, currently under treatment with bisoprolol 2.5 mgX2/day.
His diagnosis is atherosclerosis of the coronary vessels and aorta, supraventricular extrasystolic arrhythmia, and 2-degree hypertension of high risk.
The postectopic beat in the extrasystolic configuration is associated with an increased preload due to the compensatory pause and probably also due to a poor ejection at the ectopic beat.
Seeman et al., "Post extrasystolic T wave change in subjects with structural healthy ventricles-measurement and simulation," in Proceedings of the 41st Computing in Cardiology Conference (CinC '14), pp.