A patient with chest trauma has a chest tube in place. Suddenly, the chest tube disconnects from the drainage system. What is the most appropriate immediate nursing action?

Correct option is B

If the chest tube disconnects, it should be immediately placed in sterile water/saline to create a water seal and prevent air entry into pleural cavity.
Explanation of options: (a) ✘ Clamping increases risk of tension pneumothorax. (b) ✔ Correct; water seal prevents air re-entry until system is reconnected. (c) ✘ Removal and dressing cause loss of drainage, risk of effusion/tension. (d) ✘ Reconnection is done later aseptically; immediate action is sterile water seal.