Sick sinus node syndrome.
D000219:Adams-Stokes Syndrome / Q000209:etiology; D000328:Adult; D000368:Aged; D001146:Arrhythmia, Sinus / Q000175:diagnosis / Q000209:etiology; D006348:Cardiac Surgical Procedures / Q000009:adverse effects; D004554:Electric Countershock / Q000009:adverse effects; D004562:Electrocardiography; D005260:Female; D006801:Humans; D006973:Hypertension / Q000150:complications; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000150:complications; D013345:Subarachnoid Hemorrhage / Q000150:complications; D013614:Tachycardia, Paroxysmal / Q000209:etiology