An abnormal rhythm of the heartbeat or any other regular biological process in the body.
From Greek 'dys-' (bad/difficult) + 'rhythmos' (rhythm). This medical term emerged in the 19th century as doctors began to understand cardiac conditions more precisely.
While 'arrhythmia' (no heartbeat rhythm) exists, 'dysrhythmia' specifically means the rhythm is *wrong or abnormal*—not absent—which is actually a crucial distinction in cardiology that can point to different underlying problems.
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