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Figure 2 Effects of four interventions on CPP and ETCO₂ during precordial compression. Values are mean ± standard deviation. MNE = alpha-methylnorepinephrine; MNE+Y = alpha-methylnorepinephrine pretreated with yohimbine; CPP = coronary perfusion pressure; drug = the time of administration of the drugs; Epi. = epinephrine; ETCO₂ = end tidal PCO₂; PC = precordial compression. *p < 0.05; **p < 0.01.