Inappropriate shock in a subcutaneous cardiac defibrillator due to residual air

Letter by Gamble et al regarding article, "inappropriate shocks due to subcutaneous air in a patient with a subcutaneous cardiac defibrillator".

Air entrapment causing early inappropriate shocks in a patient with a subcutaneous cardioverter-defibrillator

A 37-year-old man was admitted after experiencing an out-of-hospital cardiac arrest due to ventricular fibrillation. He was successfully resuscitated and had good neurologic recovery. During admission, he was diagnosed with Brugada syndrome and received a subcutaneous implantable cardioverter-defibrillator (S-ICD; Boston Scientific, Marlborough, MA) using a standard technique. For the S-ICD imp...

Perioperative management of a patient with subcutaneous defibrillator undergoing cardiac surgery

We describe a case of inappropriate shocks due to temporary epicardial pacing after cardiothoracic surgery in a patient with a subcutaneous ICD.

Inappropriate shocks from a subcutaneous implantable cardioverter-defibrillator due to oversensing during periods of rate-related bundle branch block

The subcutaneous implantable cardioverter-defibrillator (S-ICD) is a novel technology with proven efficacy in sudden cardiac death prevention; however, there is a lack of long-term safety data. We describe the case of a 55-year-old female patient implanted with an S-ICD due to idiopathic ventricular fibrillation, who subsequently presented with inappropriate shocks leading to ventricular fibril...

Routine exercise testing could not predict T‐wave oversensing in a patient after a subcutaneous implantable cardioverter‐defibrillator implant

Subcutaneous implantable cardioverter-defibrillators (S-ICDs) are susceptible to T-wave oversensing (TWOS) caused by high rate-dependent QRS-T morphology changes. We experienced an inappropriate S-ICD shock due to TWOS, which could not be predicted by routine exercise testing. A newly available high-pass filter might be effective for avoiding this.