Table 2. The Total Number of Tests Used During First Admission and Workup.
| Test | Number (%) | Abnormal test (%) | Definite diagnosis Diagnostic yield of test (%) |
|---|---|---|---|
| Total tests | 2601 | 632 (24) | 165 (6) |
| Laboratory and blood results | 570 (100) | NA | NA |
| ECG | 569 (100) | 235 (41) | 22 (4) |
| Telemetry | 431 (76) | 103 (24) | 18 (4) |
| Echocardiogram | 272 (48) | 97 (36) | 11 (4) |
| Long-term ECG monitoring | 198 (35) | 70 (35) | 29 (15) |
| Stress ECG | 43 (8) | 6 (14) | 2 (5) |
| Orthostatic hypotension test | 114 (20) | 31 (27) | 23 (20) |
| Electrophysiological study | 29 (5) | 3 (10) | 3 (10) |
| Tilt table | 60 (11) | 34 (57) | 28 (47) |
| Carotid sinus massage | 61 (11) | 5 (8) | 5 (8) |
| Implantable loop recorder | 38 (7) | 7 (18) | 7 (18) |
| MRI cerebrum | 25 (4) | 6 (24) | 3 (12)* |
| CT cerebrum | 143 (25) | 25 (17) | 4 (3)* |
| Electroencephalogram | 48 (8) | 10 (21) | 10 (21)* |
ECG: electrocardiogram; MRI: magnetic resonance imaging; EP: electrophysiological; CT: computed tomography. *These 17 patients were all diagnosed with neurological disease during the workup, primarily epilepsy, thus the diagnostic yield was as counted, but the patients were probably ultimately classified wrongly as syncopal origin.