Arrhythmia, Sinus [Disease/Finding] Heart Block [Disease/Finding] Sick Sinus Syndrome [Disease/Finding] Sick Sinus Syndrome Sick Sinus Node Syndrome N0000002743 M0019828 A condition caused by dysfunctions related to the SINOATRIAL NODE including impulse generation (CARDIAC SINUS ARREST) and impulse conduction (SINOATRIAL EXIT BLOCK). It is characterized by persistent BRADYCARDIA, chronic ATRIAL FIBRILLATION, and failure to resume sinus rhythm following CARDIOVERSION. This syndrome can be congenital or acquired, particularly after surgical correction for heart defects. 36083008 1025538 D012804 C5664 C0037052 Sick Sinus Syndrome