本文应用CO_2重复呼吸法非创伤性地测定混合静脉血CO_2分压(PVCO_2),结合Hb、动脉血气、每分钟静息通气量、呼出气分析,电脑程序处理,对100余名健康人与肺心病患者进行同步心肺功能测验。对照多项指标,结果示肺心组P_VCO_2、VD/V_T、P(A-a)O_2、QS/Q_T、PAP、S_VO_2与P_VO_2均较健康老年组有极显著差异;PaCO_2/P_VCO_2有显著差异;而Q_T与CI无显著差异。 In this paper, the CO_2 partial pressure (PVCO_2) of mixed venous blood was measured noninvasively by CO_2 repeated respiration. Combined with Hb, arterial blood gas, resting ventilation per minute, exhaled breath analysis and computer program, more than 100 healthy volunteers Heart disease patients for synchronous cardiopulmonary function test. The results showed that P_VCO_2, VD / V_T, P (Aa) O_2, QS / Q_T, PAP, S_VO_2 and P_VO_2 were all significantly different in the pulmonary heart group compared with healthy elderly group; PaCO_2 / P_VCO_2 was significantly different; No significant difference with CI.