Key result
Nonthoracotomy defibrillation systems in dogs require ~38% higher energy thresholds by day 38 post-implantation.
Why the study?
Does the defibrillation threshold change over time following implantation of a nonthoracotomy system in dogs?
Population
10 dogs undergoing implantation of a nonthoracotomy cardioverter defibrillator system
Comparison
Implantation of a nonthoracotomy system… vs Baseline compared to subsequent postoperative days
Design
Preclinical
Follow-up
45 days
Authors
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Defibrillation energy needs may rise post-implant; hypothesis-generating for human safety margins and should not change practice.
Does the defibrillation threshold change over time following implantation of a nonthoracotomy system in dogs?
Absolute Event Rate: 16.8% vs 12.2%
p-value: p=< 0.01
Energy requirements for defibrillation with a nonthoracotomy system increase during the early postoperative period, peaking at 38 days, which may have implications for selecting safety margins in humans.
Halperin et al. (1994) studied Defibrillation threshold testing (n=10). Nonthoracotomy system implantation vs. Baseline (day 1) was evaluated on E50 (energy associated with a 50% likelihood of successful defibrillation) (p=< 0.01). In dogs, the mean energy required for a 50% likelihood of successful defibrillation with a nonthoracotomy system increased from 12.2 J at implantation to 16.8 J by day 38 (P < 0.01).
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