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Figure 2 Effects of biphasic or monophasic defibrillation waveform on postresuscitation myocardial function after 4 min of untreated VF. Values are mean ± SD. BL = baseline, CO = cardiac output, SV = stroke volume, LPWS = systolic left ventricular posterior wall thickness, LPWD = diastolic left ventricular posterior wall thickness. *p < 0.05 vs. biphasic, **p < 0.01 vs. biphasic.