Table 5. Etiology of Syncope After Discharge and After Workup.
| Etiology | Number (%) after discharge | Number (%) after workup | P value | Age < 65 years | Age ≥ 65 years | P-value between age groups |
|---|---|---|---|---|---|---|
| Reflex1 | 87 (15) | 117 (21) | < 0.001 | 80 (68) | 37 (32) | < 0.001 |
| Orthostatic hypotension2 | 41 (7) | 55 (10) | < 0.001 | 15 (27) | 40 (73) | 0.022 |
| Cardiac | 72 (11) | 102 (18) | < 0.001 | 19 (19) | 83 (81) | < 0.001 |
| Ventricular arrhythmias | 15 (3) | 18 (3) | ||||
| Sick sinus syndrome | 14 (2) | 20 (4) | ||||
| Advanced second- or third-degree AV block | 27 (5) | 44 (8) | ||||
| Structural cardiac disease | 8 (1) | 12 (2) | ||||
| Other cardiogenic3 | 8 (1) | 8 (1) | ||||
| Unknown | 363 (64) | 272 (48) | < 0.001 | 115 (42) | 157 (58) | 0.808 |
| Non syncopal events4 | 7 (1) | 24 (4) | < 0.001 | 9 (38) | 15 (62) | 0.666 |
1Vasovagal, situational and carotid sinus syncope; 2Primary autonomic failure, secondary autonomic failure, drug induced and volume depletion;3Pulmonary embolism, angina and left main stenosis, digoxin intoxication and pacemaker induced tachycardia;4Epilepsy, psychogenic pseudosyncope, stroke, intracerebral tumor, fatigue and collapse.