Linko K, Paloheimo M, Tammisto T
Acta Anaesthesiol Scand. 1983 Jun;27(3):199-202. doi: 10.1111/j.1399-6576.1983.tb01934.x.
The clinical diagnostic signs for detecting inadvertent oesophageal intubation may all be misleading. We therefore tested the practice of recording exhaled carbon dioxide during the intubation procedure as an additional measure for detection of accidental oesophageal intubation. Twenty patients were intubated simultaneously into the trachea and oesophagus and the carbon dioxide concentration was continuously recorded from both sources. Manual ventilation of the lungs always resulted in a typical CO2 curve pattern. Ventilation by mask prior to the intubation obviously resulted in some filling the stomach by exhaled gas in 9 of the 20 patients. In these cases some CO2 could be detected during oesophageal ventilation. As the oesophageal CO2 concentrations were very low initially, compared to the tracheal recordings, and carbon dioxide completely disappeared after a few ventilations into the oesophagus, distinguishing between the tracheal and oesophageal capnography tracings was easy.
用于检测意外食管插管的临床诊断体征可能都具有误导性。因此，我们测试了在插管过程中记录呼出二氧化碳的做法，作为检测意外食管插管的一项额外措施。20名患者同时被插入气管和食管，并连续记录来自这两个部位的二氧化碳浓度。手动通气肺部总能产生典型的二氧化碳曲线模式。插管前通过面罩通气显然导致20名患者中有9名胃中吸入了呼出气体。在这些情况下，食管通气时可检测到一些二氧化碳。由于最初食管中的二氧化碳浓度与气管记录相比非常低，且向食管通气几次后二氧化碳就完全消失了，所以区分气管和食管二氧化碳图描记很容易。
