Why the study?
S-ICDs have limitations including device oversensing linked to inappropriate shocks, with air entrapment inside subcutaneous pockets being an uncommon cause.
Clinicians should recognize wandering or drifting baseline signals during S-ICD interrogation as a sign of air entrapment to prevent inappropriate shocks.
Alerts clinicians to consider air entrapment in S-ICD malfunction; leaves open questions on incidence and prevention.
Subcutaneous implantable cardioverter defibrillator (S-ICD) is an accepted alternative to conventional transvenous devices. Their efficacy in arrhythmia management is comparable to ICDs. However, those devices also have limitations such as lack of anti-tachycardia pacing capability or higher occurrence of device oversensing associated with inappropriate shocks. Air entrapment inside one or more of subcutaneous pockets has been reported as one of uncommon causes of device malfunction. It is important to recognize the wandering or drifting baseline signals during device interrogation for timely diagnosis and appropriate treatment.
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Yang et al. (2019) studied this question.
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