How can you determine if the chest tube is patent after surgery?

• A. Listen for chest sounds
• B. Check the amount of bubbling in the suction control chamber
• C. Inspect the collection chamber for cracks
• D. Monitor color of drainage

Answer: (B)

Patency means the chest tube is open and able to transmit suction to the pleural space so air and fluid can be drained. In a suction drainage system, the suction control chamber should show bubbling when suction is actively transmitting to the chest. That bubbling confirms suction is reaching the tube and the system is functioning, meaning the tube is patent. If bubbling is absent, it can indicate an occlusion, kink, or disconnection and you’d need to check the tubing, connections, and suction source. Other signs like listening to breath sounds, inspecting the collection chamber for cracks, or noting drainage color don’t directly confirm that the tube is patent.