extrasystole

[ ek-struh-sis-tuh-lee ]

/ ˌɛk strəˈsɪs tə li /

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a premature contraction of the heart, resulting in momentary interruption of the normal heartbeat.

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Also called premature beat, premature contraction.

From New Latin, dating back to 1895–1900; see origin at extra-, systole

ex·tra·sys·tol·ic

[ek-struh-sis-tol-ik], /ˌɛk strə sɪsˈtɒl ɪk/, adjective

The extrasystole may have its origin in either the auricle or the ventricle.
Arteriosclerosis and Hypertension:|Louis Marshall Warfield
Provided there is no evidence of gross myocardial lesion, the extrasystole itself is of no great significance.
Arteriosclerosis and Hypertension:|Louis Marshall Warfield
If there is auricular extrasystole it can not usually be recognized except by graphic methods.
Arteriosclerosis and Hypertension:|Louis Marshall Warfield
Whenever there is a dropped beat or an intermittent pulse one may be sure that it is the result of an extrasystole.
Arteriosclerosis and Hypertension:|Louis Marshall Warfield