Clinical design of the study from screening to randomization. Abbreviations: ARVD, arrhythmogenic right ventricular dysplasia; BP, blood pressure; ECG, electrocardiogram; ECG‐HA, high‐amplification ECG; IWRS, interactive web response system; LVEF, left ventricular ejection fraction; MRI, magnetic resonance imaging; OD, once a day; TTE, transthoracic echocardiography