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asystole (n.)

"condition in which a weakened heart remains continually filled with blood," 1860, medical Latin, from Greek a- "not, without" (see a- (3)) + systole "contraction" (see systole).

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Definitions of asystole from WordNet

asystole (n.)
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
From wordnet.princeton.edu