Clinical Follow-up
During the first year after procedure, all patients were followed up with clinic visits, 24h Holter recordings, and device interrogation if available at 1, 3, 6 and 12 months. In subsequent years, same assessments would be done every 6 months. If no VT recurrence were observed, antiarrhythmic medication except beta blockers would be discontinued. LVEF was evaluated by transthoracic echocardiography annually.