title: The contribution of autonomic tone in the pathogenesis of sick sinus syndrome.
mesh_terms: D000328:Adult; D000368:Aged; D001341:Autonomic Nervous System / Q000503:physiopathology*; D004594:Electrophysiology; D005260:Female; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D012804:Sick Sinus Syndrome / Q000209:etiology / Q000503:physiopathology*