肺栓塞见于1％～2％创伤病人，其致死率为25％～50％。早期检出可以挽救一部分病人。作者试验延期肺死腔部分（FdL）作为筛选肺栓塞的工具，并可在病人床分进行，这对危重外科病人需辅助呼吸支持以及伴有成人呼吸窘迫综合征者尤为方便和适用。FdL是由CO2呼气图算出，后者与CO2 Pulmonary embolism seen in 1% to 2% of trauma patients, the lethal rate of 25% to 50%. Early detection can save some patients. The authors test the delineated dead space part of the lung (FdL) as a tool for screening for pulmonary embolism, which can be performed in patients’ beds, which is particularly convenient and applicable to patients with critical surgical patients who need assisted respiratory support and who have adult respiratory distress syndrome. FdL is calculated from the CO2 expiratory map, the latter with CO2