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Strength-interval plots of ventricular fibrillation (VF) induction at baseline. Shown are S2 trials that induced VF (▪); S2 trials that failed to induce VF (□), and S2 between the shortest and the longest coupling intervals that induced VF (×). To minimize the number of fibrillation/defibrillation episodes, we did not actually deliver these S2 to the ventricles. Ordinate (in mA) is S2 current strengths; abscissa is coupling intervals (in ms).
