Linko K, Paloheimo M
Acta Anaesthesiol Belg. 1983 Jun;34(2):117-22.
Continuous capnography recordings were made during blind nasotracheal intubation of 17 patients breathing spontaneously. The carbon dioxide analyzer (CD 300, Datex Helsinki) was connected to the open proximal end of the endotracheal tube. In addition to the auscultatory findings, capnography gave valuable information about the position of the endotracheal tube during the entire intubation procedure. The low and peaked CO2 waves recorded from the nasopharynx tended to become higher and more flat-topped as the larynx was approached. When the tip of the endotracheal tube erroneously glided behind the larynx (12 of the 17 cases) this was promptly revealed by absence of CO2 in the recording. On the other hand, entrance of the tube into the trachea could always be rapidly detected as typical flat-topped CO2 waves were seen in the capnogram. Thus capnography facilitates orientation during blind nasotracheal intubation and rapidly detects accidental oesophageal intubation. The capnographic recording also is a valuable and reliable additional sign and document of correct endotracheal intubation.
在17例自主呼吸患者的盲探经鼻气管插管过程中进行了连续二氧化碳监测记录。二氧化碳分析仪（CD 300，Datex赫尔辛基）连接到气管导管的开放近端。除了听诊结果外，二氧化碳监测在整个插管过程中提供了有关气管导管位置的有价值信息。随着接近喉部，从鼻咽部记录到的低而尖的二氧化碳波形往往会变得更高且顶部更平坦。当气管导管尖端错误地滑入喉后部时（17例中有12例），记录中二氧化碳的缺失会立即显示这一情况。另一方面，当在二氧化碳图中看到典型的平顶二氧化碳波形时，总能迅速检测到导管进入气管。因此，二氧化碳监测有助于盲探经鼻气管插管时的定位，并能快速检测到意外的食管插管。二氧化碳监测记录也是正确气管插管的有价值且可靠的附加征象和记录。
