呼出气二氧化碳(CO_2)监测仪用来测量呼出气体中的CO_2浓度。在呼气终末测量CO_2浓度最低,称为二氧化碳终末潮气量(ETCO_2)。呼出气体CO_2浓度反映了机体代谢率的改变,以及在肺功能正常情况下循环和呼吸系统的状况。CO_2增多表示代谢过高,如败血症和恶性肿瘤高热。而ETCO_2减少可能由于心输出量减少、心跳停止或肺栓塞引起,因为 An expired carbon dioxide (CO 2 ) monitor is used to measure the CO 2 concentration in the expired gas. The CO2 concentration measured at the end of exhalation is the lowest and is called the CO2 final tidal volume (ETCO_2). The exhaled gas CO 2 concentration reflects changes in the body’s metabolic rate and the condition of the circulation and respiratory system in the case of normal lung function. Increased CO2 indicates high metabolism, such as sepsis and malignancy hyperthermia. The decrease in ETCO_2 may be due to reduced cardiac output, cardiac arrest, or pulmonary embolism because