Provided there is no evidence of gross myocardial lesion, the extrasystole itself is of no great significance.
The extrasystole may have its origin in either the auricle or the ventricle.
Whenever there is a dropped beat or an intermittent pulse one may be sure that it is the result of an extrasystole.
extrasystole ex·tra·sys·to·le (ěk'strə-sĭs'tə-lē)
An ectopic, usually premature contraction of the heart, resulting in momentary cardiac arrhythmia. Also called premature systole.