Superiority of 24-hour outpatient monitoring over multi-stage exercise testing for the evaluation of syncope.
Twenty-four hour outpatient monitoring was compared with maximum multi-stage Treadmill exercise testing for the detection of dysrhythmias producing syncope or near syncope in 119 patients. All patients had cardiovascular disorders; only 21% had coronary artery disease. Patients with obvious cause of syncope and/or significant dysrhythmias by resting electrocardiograms (ECGs) were excluded. A significant dysrhythmia was found which was considered the probable cause of syncope or pre-syncope in 76 patients (64%). A non-cardiac cause was found in tachycardia, exercise testing identified only patients with complex ventricular dysrhythmias and missed 64% of these. Overall, dysrhythmias were found by ambulatory monitoring alone in 63 patients, by exercise testing alone in only three, and by both in 10. It is concluded that: 1) in the majority of patients with syncope or pre-syncope suspected to be of a cardiac origin, a dysrhythmia can be found; 2) ambulatory monitoring is far superior to exercise testing for detection of dysrhythmias; 3) exercise testing increases the yield for complex ventricular dysrhythmias.
D000293:Adolescent; D000328:Adult; D000368:Aged; D000553:Ambulatory Care; D001145:Arrhythmias, Cardiac / Q000175:diagnosis*; D002318:Cardiovascular Diseases / Q000150:complications / Q000175:diagnosis; D003327:Coronary Disease / Q000175:diagnosis; D005080:Exercise Test; D005260:Female; D006331:Heart Diseases / Q000175:diagnosis; D006801:Humans; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic / Q000295:instrumentation*; D013575:Syncope / Q000209:etiology*; D013610:Tachycardia / Q000175:diagnosis