二氧化碳重复呼吸法是一种简单、安全、可靠而又无创伤的方法。它不但可以测定成年人混合静脉血二氧化碳分压(P_V~-CO_2),而且适用于儿童。用其测定心输出量时,它与直接Fick法,染料稀释法密切相关,而且能反映运动时的心输出量变化。用以推算动脉血二氧化碳分压(PaCO_2)时,具有准确性、生理性、适用性等特点。还可测定混合静 Carbon dioxide breathing is a simple, safe, reliable and non-invasive way. It not only can measure adult partial venous carbon dioxide partial pressure (P_V ~ -CO_2), but also for children. When used to measure cardiac output, it is closely related to the direct Fick method and the dye dilution method, and can reflect changes in cardiac output during exercise. Used to calculate the partial pressure of arterial carbon dioxide (PaCO_2), with accuracy, physiology, applicability and so on. Can also be measured mixed static