The role and limitations of electrophysiologic testing in patients with unexplained syncope.
D002037:Bundle-Branch Block / Q000150:complications; D002304:Cardiac Pacing, Artificial; D004562:Electrocardiography; D004594:Electrophysiology; D006801:Humans; D012804:Sick Sinus Syndrome / Q000150:complications; D013575:Syncope / Q000209:etiology*; D013610:Tachycardia / Q000150:complications