Table 1.
Population Study
| Age, y | 12.7±3.7 |
| Male, n (%) | 32 (59%) |
| Ethnicity, n (%) | |
| White | 45 (84%) |
| Afro‐Caribbean | 5 (9%) |
| Asian | 4 (7%) |
| Circumstances of SCD, n (%) | |
| Sport/strenuous activity | 15 (28%) |
| Daily activity | 11 (20%) |
| Emotional stress | 11 (20%) |
| Rest | 12 (22%) |
| Sleep | 5 (10%) |
| Confirmation of IVF, n (%) | |
| Coronary angiogram | 24 (44%) |
| Imaging | |
| Echo | 54 (100%) |
| CMR | 38 (70%) |
| Treadmill test | 45 (83%) |
| Pharmacological tests, n (%) | |
| Isoproterenol | 38 (70%) |
| Ajmaline | 24 (44%) |
| Flecainide | 13 (24%) |
| Endomyocardial biopsy | 7 (13%) |
| Before the SCD event, n (%) | |
| Syncope | 28 (52%) |
| Epilepsy | 5 (9%) |
| Palpitations | 2 (4%) |
| Family history of SCD, n (%) | 15 (28%) |
| First degree | 10 (67%) |
| Second degree | 3 (20%) |
| Third degree | 2 (13%) |
CMR indicates cardiac magnetic resonance; Echo, echocardiogram; IVF, idiopathic ventricular fibrillation; SCD, sudden cardiac death.