Table 4. Number of Tests Performed During Workup in 102 Patients Where the Etiological Diagnosis Was Unknown at Discharge but Apparent After Workup.
| Test | Number (%) | Abnormal test (%) | Definite diagnosis. Diagnostic yield of test (%) |
|---|---|---|---|
| Echocardiogram | 74 (73) | 25 (34) | 5 (7) |
| Long-term ECG monitoring | 72 (71) | 32 (44) | 19 (26) |
| Stress ECG | 13 (13) | 1 (8) | 1 (8) |
| Orthostatic hypotension test | 30 (29) | 8 (27) | 7 (23) |
| Electrophysiological study | 10 (10) | 2 (20) | 2 (20) |
| Tilt table | 36 (35) | 25 (69) | 22 (61) |
| Carotid sinus massage | 36 (35) | 3 (8) | 3 (8) |
| Implantable loop recorder | 12 (12) | 6 (50) | 6 (50) |
| MRI cerebrum | 10 (10) | 4 (40) | 3 (75)* |
| CT cerebrum | 26 (25) | 5 (19) | 4 (15)* |
| Electroencephalogram | 13 (13) | 4 (31) | 4 (31)* |
*These 11 tests were performed in patients who received another definitive diagnosis than syncope and were initially classified wrongly by the discharging physician.