title: [Vagal function in middle-aged and young patients with sinus nodal dysfunction].
authors.forename: S
authors.initials: S
authors.lastname: Huang
mesh_terms: D000328:Adult; D001285:Atropine / Q000494:pharmacology; D001919:Bradycardia / Q000503:physiopathology*; D002304:Cardiac Pacing, Artificial / Q000379:methods; D004594:Electrophysiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011433:Propranolol / Q000494:pharmacology; D012849:Sinoatrial Node / Q000503:physiopathology*; D014630:Vagus Nerve / Q000187:drug effects / Q000503:physiopathology*
chemical_list: D001285:Atropine; D011433:Propranolol