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Figure 1 Shock waveforms used in the study, across a 77 ohm resistance. This represents the median transthoracic impedance observed in the study. A monophasic damped sine (MDS) waveform (solid line) was compared with a biphasic truncated exponential (BTE) waveform (dashed line). Dashed line = BTE (150 J); solid line = MDS (150 J).