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| Sick Sinus Syndrome Sick Sinus Syndromes | Sinus Syndrome, Sick | Sinus Syndromes, Sick | Syndrome, Sick Sinus | Syndromes, Sick Sinus Dysfunction of the sinoatrial node manifested by persistent sinus bradycardia, sinus arrest, sinoatrial exit block, chronic atrial fibrillation and inability of the heart to resume sinus rhythm following cardioversion for atrial fibrillation. |