Table 2:
Etiology of Syncope
| Etiology | PET (n=640) |
SPECT (n=684) |
Total (n=1324) |
|---|---|---|---|
| Idiopathic | 101 (15.8%) | 293 (42.8%) | 394 (29.8%) |
| Vasovagal/neurocardiogenic | 210 (32.8%) | 171 (25.0%) | 381 (28.8%) |
| SVT | 30 (4.7%) | 52 (7.6%) | 82 (6.2%) |
| Orthostatic | 47 (7.3%) | 27 (3.9%) | 74 (5.6%) |
| Sick sinus syndrome | 49 (7.7%) | 21 (3.1%) | 70 (5.3%) |
| Pulmonary hypertension | 45 (7.0%) | 24 (3.5%) | 69 (5.2%) |
| Bradycardia | 46 (7.2%) | 19 (2.8%) | 65 (4.9%) |
| Ventricular tachycardia | 32 (5.0%) | 24 (3.5%) | 56 (4.2%) |
| Exercise-induced | 11 (1.7%) | 27 (3.9%) | 38 (2.9%) |
| Complete heart block | 25 (3.9%) | 9 (1.3%) | 34 (2.5%) |
| Aortic stenosis | 26 (4.1%) | 8 (1.2%) | 34 (2.5%) |
| Hypertrophic obstructive cardiomyopathy |
7 (1.1%) | 3 (0.4%) | 10 (0.7%) |
| 2nd degree heart block type 2 | 8 (1.3%) | 2 (0.3%) | 10 (0.7%) |
| Wolf Parkinson White | 2 (0.3%) | 4 (0.6%) | 6 (0.5%) |
| Long QT | 1 (0.2%) | 0 (0%) | 1 (0.1%) |