NCLEX Practice Test

Firmly covering the insertion site of a dislodged chest tube primarily serves to prevent air from entering the pleural space, which could lead to an air embolism. When a chest tube becomes dislodged, there's a risk that the negative pressure in the pleural cavity is compromised, allowing air to enter and potentially causing a pneumothorax. By covering the insertion site tightly, it creates a seal that helps maintain the negative pressure and prevents air from entering, reducing the risk of an air embolism. While the other options, such as bleeding, infection, and pneumothorax, are important considerations in the management of chest tubes, the primary immediate concern with a dislodged chest tube is to prevent air from entering the pleural space, hence focusing on preventing an air embolism.