Table 2.
Etiology of the Syncopal Event
| Etiology | n(%)(n= 1,516) |
|---|---|
| Cardiovascular | 284 (18.7) |
| Bradycardia, unspecified | 52 (3.4) |
| Complete heart block | 36 (2.4) |
| Ventricular tachycardia | 35 (2.3) |
| Atrial fibrillation or flutter | 34 (2.2) |
| Supraventricular tachycardia | 25 (1.6) |
| Sick sinus syndrome | 23 (1.5) |
| Myocardial ischemia | 16 (1.1) |
| Aortic stenosis | 14 (0.9) |
| Pulmonary embolus | 10 (0.7) |
| Mobitz 2 heart block | 9 (0.6) |
| Pacemaker dysfunction | 3 (0.2) |
| Other cardiovascular * | 27 (1.8) |
| Noncardiovascular | 602 (39.7) |
| Vasovagal | 175 (11.5) |
| Orthostasis or dehydration | 166 (10.9) |
| Drug induced | 55 (3.6) |
| Bleeding or anemia | 33 (2.2) |
| Seizures | 29 (1.9) |
| Transient ischemic attack | 18 (1.2) |
| Micturation or tussive | 18 (1.2) |
| Cerebrovascular accident | 13 (0.9) |
| Psychiatric | 9 (0.6) |
| Other noncardiovascular † | 86 (5.7) |
| Unexplained | 630 (41.6) |
*
Includes unspecified arrhythmias, carotid sinus syncope, ruptured aorta, and miscellaneous.
†
Includes infections, vertigo, hypoglycemia, subclavian steal, and miscellaneous.