An abnormal or irregular contraction of the heart during systole, the phase when the heart pumps blood.
From Greek 'dys-' (bad/difficult) + 'systole' (contraction), from 'systasis' (to draw together). This is a specific cardiac term describing abnormal heart contractions.
Your heart's job is all about timing—dyssystole is when that timing gets messed up in the contraction phase specifically, which is why cardiologists care deeply about systolic function as opposed to overall irregular rhythms.
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