CAMRT Radiography Practice Exam

What is the typical position of the ET tube relative to the tracheal bifurcation during intubation?

1. Below the carina

2. At the level of the oropharynx

3. 5-7 cm above the carina

4. In the left main bronchus

The correct answer is: 5-7 cm above the carina

The typical position of the endotracheal (ET) tube during intubation is generally aimed to be around 5-7 cm above the carina, which is the bifurcation of the trachea into the right and left main bronchi. This positioning is significant because placing the ET tube at this distance allows for effective ventilation while also preventing inadvertent intubation into one of the main bronchi, which could lead to inadequate ventilation of the opposite lung. Maintaining the ET tube in this position ensures that both lung fields receive adequate air supply and minimizes the risk of complications, such as accidental extubation or occlusion. It also facilitates the assignment of the right position when confirming placement, typically through physical examination and imaging methods like chest X-rays. The other positions mentioned would pose various risks or inefficiencies. Placing the ET tube below the carina would lead to right or left main stem intubation, which would deprive the other lung of ventilation. Positioning it at the level of the oropharynx would not provide airway protection or effective ventilation, while placement in the left main bronchus could cause atelectasis in the right lung and further complications.