| Word | Definitions | Synonyms |
|---|---|---|
| asystole | (noun) absence of systole; failure of the ventricles of the heart to contract (usually caused by ventricular fibrillation) with consequent absence of the heart beat leading to oxygen lack and eventually to death | Synonyms: cardiac arrest, cardiopulmonary arrest |
| extrasystole | (noun) a premature systole resulting in a momentary cardiac arrhythmia | - |
| extrasystolic | (adjective) of or relating to or happening during an extrasystole | - |