RT Journal Article SR Electronic T1 Syncope: Etiology and diagnostic approach JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 755 OP 766 DO 10.3949/ccjm.81a.13152 VO 81 IS 12 A1 Elias B. Hanna YR 2014 UL http://www.ccjm.org/content/81/12/755.abstract AB There are three major types of syncope: neurally mediated (the most common), orthostatic hypotensive, and cardiac (the most worrisome). Several studies have shown a normal long-term survival rate in patients with syncope who have no structural heart disease, which is the most important predictor of death and ventricular arrhythmia. The workup of unexplained syncope depends on the presence or absence of heart disease: electrophysiologic study if the patient has heart disease, tilt-table testing in those without heart disease, and prolonged rhythm monitoring in both cases if syncope remains unexplained.