['Following national guidance on management of sudden unexplained death (SUD) in the young, inherited cardiac conditions (ICC) clinics were established to identify and treat relatives thought to be at increased risk. Studies have examined diagnostic yield of these clinics but outcome of clinical management has not been reported.', 'Observational outcome study of consecutively referred relatives of SUD victims.', 'Regional ICC clinic.', '193 individuals (108 families) referred to a regional ICC clinic following SUD/aborted cardiac arrest of a young relative (mean follow-up 16.5 months, range 0.1-61).', 'All individuals underwent assessment by history, examination, ECG and echocardiography. Exercise electrocardiography, ajmaline provocation, further imaging techniques and genetic testing were performed in selected individuals. Implantable cardioverter-defibrillator (ICD) insertion based on national guidelines.', 'Forty-five patients (23%) from 38 families (35%) were diagnosed with an inheritable cause of sudden death. Eighteen had potentially prognostically important medication commenced and 4 had an ICD inserted on clinic recommendation (2 hypertrophic cardiomyopathy, 1 dilated cardiomyopathy, 1 arrhythmogenic right ventricular cardiomyopathy). Two other individuals had ICDs removed after negative testing for familial RYR2 mutations. No deaths have occurred during follow-up to date.'] Are the clinical management of relatives of young sudden unexplained death victims ; implantable defibrillators rarely indicated?