Transient Defibrillation Threshold Elevation Associated With Air in the Generator Pocket After Extravascular ICD Implantation

In addition to the subcutaneous implantable cardioverter-defibrillator (S-ICD), the extravascular implantable cardioverter-defibrillator (EV-ICD), which uses a substernal lead, has recently been introduced into clinical practice as a non–transvenous ICD system. The EV-ICD enables defibrillation without intravascular or intracardiac leads and is distinguished by its ability to provide additional therapeutic options, including antitachycardia pacing (ATP).