Successful defibrillation verification in subcutaneous implantable cardioverter‐defibrillator recipients by low‐energy shocks
Why the study?
The authors sought to investigate the defibrillation safety margin and the efficacy of terminating induced ventricular fibrillation at S-ICD implantation using energies lower than the recommended 65 J.
Does low-energy shock testing (20-50 J) effectively terminate induced ventricular fibrillation in S-ICD recipients?
Comparison
Induced VF termination attempts using lower energies (20 to 50 J) vs recommended 65 J
Authors
Discussion
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Member takes
Implication
Low-energy VF termination rates support cautious S-ICD energy optimization; leaves open need for randomized safety-margin trials.
Structured PICO
Does low-energy shock testing (20-50 J) effectively terminate induced ventricular fibrillation in S-ICD recipients?
P
Population
64 consecutive subcutaneous implantable cardioverter-defibrillator (S-ICD) recipients
I
Intervention
Induced ventricular fibrillation (VF) termination attempts at implantation using lower energies (ranging from 20 to 50 J)
O
Outcome
Efficacy of induced ventricular fibrillation (VF) terminationsurrogate
Low-energy shocks (≤40 J) successfully terminate induced VF in 84% of S-ICD recipients, suggesting that a 60 J output device may provide an adequate safety margin while enabling device downsizing.
Cite This Study
Biffi et al. (2019) studied this question.