Goodman L R, Conrardy P A, Laing F, Singer M M
AJR Am J Roentgenol. 1976 Sep;127(3):433-4. doi: 10.2214/ajr.127.3.433.
A malpositioned endotracheal tube is a potential hazard to the intubated patient. Ideally, the tube tip should be 5+/-2 cm from the carina when the head and neck are in neutral position. In 92 of 100 patients studied, the carina overlay T5, T6, or T7 on portable radiographs. Therefore, even when the carina is not visible, it can be assumed that a tube tip positioned at the level of T3 or T4 is safe. The degree of neck flexion or extension at the time of radiography may be determined by evaluating the position of the mandible relative to the vertebral bodies.
气管内导管位置不当对插管患者来说是一个潜在风险。理想情况下，当头部和颈部处于中立位时，导管尖端应距离隆突5±2厘米。在研究的100例患者中，有92例在便携式X光片上显示隆突位于T5、T6或T7水平。因此，即使隆突不可见，也可认为导管尖端位于T3或T4水平是安全的。可通过评估下颌骨相对于椎体的位置来确定拍摄X光片时颈部的屈伸程度。
