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Figure 5 Effects of four interventions on postresuscitation –dP/dt. Values are mean ± standard deviation. {alpha}MNE = alpha-methylnorepinephrine; {alpha}MNE+Y = alpha-methylnorepinephrine pretreated with yohimbine; BL = baseline; DF = defibrillation; Epi. = epinephrine; PC = precordial compression; VF = ventricular fibrillation. *p < 0.05; **p < 0.01 vs. epinephrine.