混合静脉血二氧化碳分压(P_(CO2))的测定有助于判断机体的代谢和呼吸状况。它可作为CO_2潴留和肺泡换气功能的指标,也可用于心输出量的无创测定。在许多临床应用中,静脉P_(CO2)的无创测定也间接地测定了动脉P_(CO2)。动脉的P_(CO2)值随着呼吸频率和深度的变化而迅速波动。但混合静脉血P_(CO2)的变化较小,这是由于人体组织象一个水库不断 Mixed venous carbon dioxide partial pressure (P_ (CO2)) determination helps determine the body’s metabolism and respiratory status. It can be used as an indicator of CO 2 retention and alveolar ventilation, can also be used for non-invasive determination of cardiac output. In many clinical applications, arterial P_ (CO2) is also indirectly measured by noninvasive measurement of venous P_ (CO2). Arterial P_ (CO2) values ​​fluctuate rapidly with changes in respiratory rate and depth. However, mixed venous blood P_ (CO2) changes in small, which is due to human tissue like a reservoir constantly