Clinical outcomes of subcutaneous implantable cardiac defibrillator implantation – Iran SICD registry.

Background: The subcutaneous implantable‐defibrillator (S‐ICD) is a relatively new alternative to the transvenous ICD system to minimize intravascular lead‐related complications. This paper presents outcome of SICD implantation in patients enrolled in Iran S‐ICD registry. Methods: Between October 2015 and June 2022, this prospective multicenter national registry included 223 patients with a standard indication for an ICD, who neither required bradycardia pacing nor needed cardiac resynchronization to evaluate the early post‐implant complications and long‐term follow‐up results of the S‐ICD system. Results: The mean age of the patients was 45 ± 17 years. The majority (79.4%) were male. Ischemic cardiomyopathy (39.5%) was the most common underlying disorder among patients selected for S‐ICD implant. Most study patients (68.6%) had ICD for primary prevention of sudden cardiac death. Seven patients (3.1%) were found to have suboptimal lead positions. Six patients (2.7%) developed a pocket hematoma; all were managed medically. During a mean follow‐up of 2 years, the appropriate therapy was recorded in 13% of the patients and inappropriate ICD intervention mainly due to supraventricular tachycardia in 8.9%. Pocket infection was observed in four patients (1.8%) and five patients (2.2%) died mainly due to heart failure. Conclusion: S‐ICDs were effective at detecting and treating both induced and spontaneous ventricular arrhythmias. Major clinical complications were rare. [ABSTRACT FROM AUTHOR]