Table II.
Etiology of syncope on work-up in 459 patients
| Etiology of syncope | Results, n (%) |
|---|---|
| Vasovagal | 96 (21) |
| Volume depletion | 50 (11) |
| Etiology undetermined | 148 (32) |
| Orthostatic hypotension | 15 (3) |
| Sick sinus syndrome | 16 (3) |
| Advanced second-degree or third-degree atrioventricular block | 11 (2) |
| Supraventricular tachycardia | 8 (2) |
| Ventricular tachycardia | 23 (5) |
| Acute coronary syndrome | 22 (5) |
| Aortic stenosis | 13 (3) |
| Intracranial causes | 9 (2) |
| Drug overdose | 8 (2) |
| Hypoglycemia | 6 (1) |
| Hypertrophic obstructive cardiomyopathy | 4 (1) |
| Carotid sinus hypersensitivity | 4 (1) |
| Other causes | 26 (5) |