Related formsex·tra·sys·tol·ic [ek-struh-sis-tol-ik] /ˌɛk strə sɪsˈtɒl ɪk/, adjective
Examples from the Web for extrasystole
Whenever there is a dropped beat or an intermittent pulse one may be sure that it is the result of an extrasystole.
The extrasystole may have its origin in either the auricle or the ventricle.
Provided there is no evidence of gross myocardial lesion, the extrasystole itself is of no great significance.