本组实验表明,在恒定的通气量的情况下,向中心静脉血中注射NaHCO3后,呼气末二氧化碳显著增高,其增高的幅度ΔPETCO2是与CO×Hb呈线性相关。如已知Hb,ΔPETCO2是反映CO的有意义的指标。在机械通气的病人中,可通过测定ΔPETCO2这一简便经济的方法,对心排量作出判断,并且此方法是安全的。
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