Fig. 2.

Diagnostic approach after a sudden cardiac arrest (SCA). Flowchart indicating all diagnostic tests that need to be performed before diagnosing a patient with idiopathic ventricular fibrillation (iVF). After first investigation with standard testing (electrical testing with an electrocardiogram (ECG) and imaging testing including both echocardiography and coronary imaging) a patient is considered an unexplained cardiac arrest survivor. After additional testing, the diagnosis of iVF can be made. Adapted from Visser et al. [1], with permission from Wolters Kluwer Health, Inc