Key result
Biphasic defibrillation lowers energy requirements ~44% versus monophasic pulses in isolated rabbit hearts.
Why the study?
Does a biphasic defibrillation pulse reduce defibrillation threshold voltage and energy compared to a monophasic pulse in an isolated rabbit heart model?
Population
11 adult male New Zealand white rabbits weighing 2.8(0.27) kg, isolated Langendorff heart model.
Comparison
10 ms biphasic defibrillation pulse after 10 s… vs 5 ms monophasic defibrillation pulse after 10 s…
Design
Preclinical, randomly selected voltages
Authors
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Supports biphasic waveforms for lower thresholds in models; leaves open clinical translation pending human trials.
Does a biphasic defibrillation pulse reduce defibrillation threshold voltage and energy compared to a monophasic pulse in an isolated rabbit heart model?
p-value: p=<0.05
In an isolated rabbit heart model, biphasic defibrillation waveforms achieved successful defibrillation at significantly lower voltages and energies than monophasic waveforms.
Holley et al. (1991) studied Ventricular fibrillation (n=11). Biphasic defibrillation pulse vs. Monophasic defibrillation pulse (5 ms) was evaluated on Defibrillation threshold voltage and energy at 50% success (V50, E50) (p=<0.05). In an isolated rabbit heart model, a biphasic defibrillation pulse achieved 50% success at significantly lower voltage (48 V vs 79 V) and energy (0.15 J vs 0.27 J) than a monophasic pulse (p<0.05).
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