Table 3.

Overview of diagnoses

Diagnosis	Number of patients	Findings before diagnosis
Total	38 (100%)
Cardiomyopathy	18 (47%)
– Arrhythmogenic cardiomyopathy	9 (24%)	9 patients with non-diagnostic findings at baseline (100%)
– Dilated cardiomyopathy	5 (13%)	2 patients with non-diagnostic findings at baseline (40%)
– Hypertrophic cardiomyopathy	4 (10%)	4 patients with non-diagnostic findings at baseline (100%)
Channelopathy	14 (37%)
– Brugada syndrome	5 (13%)	3 patients without provocation test at baseline, resulting in a diagnosis during follow-up (60%)
– Long-QT syndrome	1 (3%)
– Catecholaminergic—polymorphic VT	5 (13%)	5 patients with ectopy during diagnostic testing at baseline (100%)
– Early repolarisation syndrome	3 (8%)
Myocarditis	1 (3%)
Coronary artery spasm	2 (5%)
Other	3 (8%)

VT ventricular tachycardia