AbstractBackgroundPatients with nonischemic dilated cardiomyopathy (DCM) are susceptible to arrhythmias and implantable cardioverter defibrillator (ICD) in addition to medical treatments may help prevent sudden cardiac death (SCD) and improve survival in this population.HypothesisWe aim to investigate the impact of ICD insertion on survival and prognosis of patients with nonischemic DCM.MethodsWe retrospectively analyzed data from patients with nonischemic DCM treated with medical therapy with or without ICD who referred to our hospital from January 2020 to November 2021. Patients were divided based on the treatment that they had received into two equal groups. Different variables including demographic features, comorbidities, medical treatments, hospitalization rate, function class, and left ventricular ejection fraction before and after treatments were investigated in this study. In addition, variables in survival including overall survival (OS) and SCD were compared between the two groups.ResultsA total of 120 patients were investigated in this study. Mean ± SD of age and follow‐up time of patients were 64.0 ± 12.7 years old and 61.2 ± 15.9 months, respectively. Ten (16.7%) patients with medical therapy, and seven (11.7%) patients with ICD and medical therapy died during the follow‐up period (p= 0.25). However, the two groups had a significant difference regarding SCD (11.7% vs. 1.7%,p= 0.02).ConclusionIn patients with nonischemic DCM who had undergone ICD insertion in addition to standard medical treatments, SCD was significantly reduced compared with patients receiving just medical treatments. OS had no significant difference between our two studied groups.