Key result
Involuntary muscle noise during S-ICD testing may inhibit VF detection.
Why the study?
Does involuntary muscle response inhibit detection of ventricular fibrillation during S-ICD defibrillation testing?
Does involuntary muscle response inhibit detection of ventricular fibrillation during S-ICD defibrillation testing?
Involuntary muscle responses during S-ICD defibrillation testing can generate noise that inhibits appropriate shock therapy for ventricular fibrillation.
Alerts clinicians to noise risk during S-ICD testing; leaves open clinical relevance pending prospective studies.
The subcutaneous implantable cardioverter-defibrillator (S-ICD) has been shown to be a safe and efficacious alternative to the transvenous ICD for the prevention of sudden cardiac death.1 The S-ICD avoids the intracardiac space and therefore senses subcutaneous electrocardiographic signals instead of near-field signals. This different methodology causes a benign delay of sensing of ventricular arrhythmias and prolonged time to therapy.2 A recently published multicenter study described inhibition of shock therapy during defibrillation testing (DFT) in 5 de novo S-ICD implantations owing to noise sensing.
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Baalman et al. (2019) studied Ventricular fibrillation. Subcutaneous implantable cardioverter-defibrillator (S-ICD) was evaluated. Noise caused by involuntary muscle response may inhibit detection of ventricular fibrillation during defibrillation testing in patients with subcutaneous implantable cardioverter-defibrillators.
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