title: Assessment of sinus node function in patients with the sick sinus syndrome.
mesh_terms: D000328:Adult; D000368:Aged; D001146:Arrhythmia, Sinus / Q000503:physiopathology*; D001285:Atropine; D002346:Carotid Sinus; D004562:Electrocardiography; D005080:Exercise Test; D005260:Female; D006801:Humans; D007545:Isoproterenol; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial; D012849:Sinoatrial Node / Q000187:drug effects / Q000503:physiopathology*; D013575:Syncope / Q000209:etiology; D014636:Valsalva Maneuver
chemical_list: D001285:Atropine; D007545:Isoproterenol