What is a common cause of persistent bubbling in the suction chamber?

• A. An air leak in the system or pleural space; check connections and the dressing for leaks; verify patient is ventilated if applicable.
• B. A normal sign of suction; no action needed.
• C. Blockage of chest tube.
• D. Lack of chest drainage.

Answer: (A)

Persistent bubbling in the suction chamber points to an air leak somewhere in the chest-tube system or the pleural space. When suction is applied, air should move through the system and show a controlled level of bubbling; ongoing bubbles indicate that air is entering from another source rather than being drawn solely through the fluid column. The key steps are to inspect all connections for looseness or disconnections, check the dressing around the chest tube for leaks, and confirm that the system is intact and properly connected. If the patient is on ventilation, also consider potential leaks in the ventilator circuit or around the airway. By identifying and sealing the leak, the bubbling should decrease or stop, confirming the system is airtight.