title: Electrophysiological testing of sinus node function.
mesh_terms: D002304:Cardiac Pacing, Artificial; D004562:Electrocardiography; D006325:Heart Atria / Q000503:physiopathology; D006339:Heart Rate; D006801:Humans; D005082:Physical Exertion; D012804:Sick Sinus Syndrome / Q000175:diagnosis / Q000503:physiopathology*; D012848:Sinoatrial Block / Q000503:physiopathology; D012849:Sinoatrial Node / Q000503:physiopathology*; D014630:Vagus Nerve / Q000503:physiopathology