呼气末CO2浓度或分压（ETCO2)的监测可反映肺通气，还可反映肺血流。在无明显心肺疾患且V/Q比值正常时。ETCO2可反映PaCO2（动脉血二氧化碳）,正常ETCO2为5%相当于5KPa(38mmHg)。
两组之间无明显的血液动力学或呼气末二氧化碳分压的差别。
There were no significant differences in hemodynamics and end-tidal CO2 partial pressure between the two groups.
如果使用二氧化碳分析仪，其显示的正常二氧化碳的波形表明潮气末二氧化碳的数值有可能代表真正的呼气末样品。
If a capnograph is used, the presence of a normal shape of the capnographic curve indicates that the number displayed for end-tidal carbon dioxide is likely to represent a true end-expiratory sample.
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