[ek-struh-sis-tuh-lee] /ˌɛk strəˈsɪs tə li/

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

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.


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