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Figure 2 Cumulative success in conversion of atrial fibrillation, according to the number of shocks delivered per protocol. See text for details of protocol. Greater success was observed using the biphasic waveform (hatched bar) with a total of one, two or three shocks (100 J, 150 J and 200 J). After the fourth shock (repeat 200 J biphasic or 360 J monophasic [dashed bar]), there was no significant difference in conversion success. *p < 0.0001.