Rich G F, Sconzo J M
University of Virginia Health Sciences Center, Charlottesville 22908.
Can J Anaesth. 1991 Mar;38(2):201-3. doi: 10.1007/BF03008145.
End-tidal CO2 (ETCO2) sampled using a 22-gauge needle inserted through the wall of the proximal endotracheal tube was compared with ETCO2 obtained from the standard proximal connector to determine which was the more accurate sampling site for estimation of arterial CO2 tension (PaCO2). Fourteen infants were anaesthetized and their lungs ventilated using a Drager ventilator and a paediatric circle system. Blood gas determination of PaCO2 was obtained from an arterial catheter and compared with continuous sampling of ETCO2 analyzed by raman spectroscopy. The PaCO2 (35.3 +/- 4.9 mmHg, x +/- SD) was not different from the ETCO2 sampled within the proximal endotracheal tube (34.7 +/- 3.8 mmHg), but was greater (P less than 0.05) than the ETCO2 at the proximal connector (31.6 +/- 4.0 mmHg). We conclude that in infants during ventilation with a circle system, the PaCO2 can be accurately assessed by continuous sampling of ETCO2 from the proximal endotracheal tube.
使用一根22号针头穿过近端气管导管壁采集的呼气末二氧化碳（ETCO2），与从标准近端接头获取的ETCO2进行比较，以确定哪个是估计动脉血二氧化碳分压（PaCO2）更准确的采样部位。对14名婴儿进行麻醉，使用德尔格呼吸机和小儿循环系统对其肺部进行通气。通过动脉导管测定PaCO2的血气，并与通过拉曼光谱分析的ETCO2连续采样结果进行比较。PaCO2（35.3±4.9 mmHg，x±SD）与在近端气管导管内采样的ETCO2（34.7±3.8 mmHg）无差异，但高于近端接头处的ETCO2（31.6±4.0 mmHg，P<0.05）。我们得出结论，在使用循环系统通气的婴儿中，通过从近端气管导管连续采样ETCO2可以准确评估PaCO2。
