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Figure 1 Percent success for external defibrillation of spontaneous ventricular fibrillation (VF) with shocks from 1.5x to >2.5x the defibrillation threshold (DFT) for electrical VF (protocol 3). The x-axis indicates the energy required to defibrillate spontaneous VF as a multiple of the DFT for 60-Hz VF.
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