Key result
During S-ICD implantation, a 50-Hz burst induced ventricular fibrillation but shock was inhibited due to noise oversensing in the primary vector, requiring a 150 J external rescue shock.
Why the study?
Intraoperative DFT is recommended during S-ICD implantation, but few cases of noise oversensing inhibiting therapies have been reported.
Case Report (n=1)
This case highlights that 50-Hz burst induction during S-ICD defibrillation testing may cause diaphragmatic muscle spasm leading to noise oversensing and failure to deliver shock, which can be resolved by changing the sensing vector.
Answers are grounded in this paper and cite their sources.
Clinicians should anticipate possible noise oversensing with 50-Hz induction in S-ICD testing; single case leaves open need for vector protocols or alternative induction methods.
BACKGROUND: Subcutaneous implantable cardioverter-defibrillator (S-ICD) represents an efficient alternative to transvenous ICD in patients who do not require pacing. The intraoperative defibrillation test (DFT) is recommended during S-ICD implantation to confirm appropriate sensing and successful 65-J termination of induced ventricular fibrillation (VF). However, few cases of oversensing of noise inhibiting therapies have been reported. CASE SUMMARY: We report the case of a 50-year-old man who underwent S-ICD implantation for secondary prevention of sudden cardiac death. Immediately after S-ICD implantation, VF was induced using a 50-Hz burst; however, shock was not delivered owing to sustained noise on the electrogram in the primary vector. Therefore, an external rescue shock was needed at 150 J. We changed the sensing vector from primary to secondary and performed a second DFT. The S-ICD could deliver an appropriate shock and was able to successfully terminate VF without noise markers in the secondary vector. During the second DFT, one back-up pacing was delivered after the shock; the sensing vector then automatically switched from the secondary to the alternate vector. However, noise was observed in the alternate vector despite sinus rhythm restoration. DISCUSSION: The present case demonstrated that noise was recorded in two different vectors during DFT, possibly supporting the hypothesis that the muscle spasm of the diaphragm induced by the 50-Hz burst causes oversensing of noise by the S-ICD.
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Tamura et al. (2020) conducted a case report in Secondary prevention of sudden cardiac death (n=1). Subcutaneous implantable cardioverter-defibrillator (S-ICD) implantation and defibrillation test was evaluated on Delivery of appropriate shock during defibrillation test. During S-ICD implantation, a 50-Hz burst induced ventricular fibrillation but shock was inhibited due to noise oversensing in the primary vector, requiring a 150 J external rescue shock.
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