title: A study of atrioventricular nodal function in patients with the sick sinus syndrome.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001283:Atrioventricular Node / Q000187:drug effects / Q000503:physiopathology*; D001285:Atropine / Q000494:pharmacology; D001341:Autonomic Nervous System / Q000503:physiopathology; D005260:Female; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012804:Sick Sinus Syndrome / Q000503:physiopathology*; D012849:Sinoatrial Node / Q000503:physiopathology
chemical_list: D001285:Atropine