Relating to a condition where the heart fails to contract or shows no heartbeat on an ECG monitor.
From Greek 'a-' (without) and 'systole' (contraction of the heart), this medical term describes cardiac arrest or complete absence of heart contractions.
Asystole is different from fibrillation—in fibrillation the heart quivers uselessly, but in asystole it just stops entirely, and it's one of the hardest arrhythmias to reverse.
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