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| Predominant prodrome | Etiology |
||||
|---|---|---|---|---|---|
| Cardiac | Orthostatic | Reflex | Unknown | P value | |
| Palpitations (%) | 2 (2) | 0 | 2 (2) | 12 (4) | 0.045 |
| Light-headedness, nausea and sweating (%) | 19 (19) | 16 (29) | 58 (50) | 54 (20) | < 0.001 |
| Chest pain (%) | 1 (1) | 3 (5) | 0 | 5 (2) | 0.330 |
| During exercise (%) | 3 (3) | 0 | 0 | 9(3) | 0.527 |
