Table 2.
Diagnostic tests performed for patients with ventricular arrhythmia of unclear cause and idiopathic VF.
| Diagnostics | Ventricular Arrhythmia of Unclear Cause (n = 37) | Idiopathic VF (n = 21) * |
|---|---|---|
| History taking | 37 (100.0%) | 21 (100.0%) |
| Physical examination | 37 (100.0%) | 21 (100.0%) |
| Electrocardiography | 37 (100.0%) | 21 (100.0%) |
| Laboratory analysis | 37 (100.0%) | 21 (100.0%) |
| Toxicology | 7 (18.9%) | 7 (33.3%) |
| Echocardiography | 37 (100.0%) | 21 (100.0%) |
| Telemetry/Holter | 37 (100.0%) | 21 (100.0%) |
| Exercise testing | 15 (40.5%) | 9 (42.9%) |
| Cardiac MRI | 33 (89.2%) | 18 (85.7%) |
| Ajmaline provocation test | 9 (24.3%) | 7 (33.3%) |
| Coronary artery CT angiography | 4 (10.8%) | 2 (9.5%) |
| Coronary angiography | 34 (91.9%) | 19 (90.5%) |
| Genetic testing | 19 (51.4%) | 13 (61.9%) |
All diagnostic tests stated were performed within 6 months prior to and 3 months after the index event, with the exception of genetic testing and ajmaline provocation test, which could be performed at any time point after the index event. CT, computed tomography; MRI, magnetic resonance imaging; VF, ventricular fibrillation. * The population with idiopathic VF is a subset of the population with a ventricular arrhythmia of unclear cause.