Bubbling in the water-seal chamber indicates what?

• A. Air collection bottle is flowing normally
• B. A kink in the chest tube
• C. Leak in the chest tube
• D. A clogged drainage system

Answer: (C)

Bubbling in the water-seal chamber shows air is moving through the drainage system. The water-seal acts like a one-way valve: air from the pleural space can escape into the atmosphere through the tube, but outside air can’t flow back into the chest. When bubbling is continuous rather than tied to breathing, it signals a persistent air leak somewhere along the chest-tube pathway or at the connections. That’s why this finding points to a leak in the chest-tube system.

A kink or clog typically reduces drainage or occludes the line and won’t produce ongoing bubbling in the water-seal chamber the way a leak does. If troubleshooting is needed, inspect all connections, ensure the chest tube remains in place, and check for any leaks along the tubing or at the insertion site.