What does continuous bubbling in the water-seal chamber indicate?

• A. The system is functioning normally with no air leak.
• B. A blockage in the drainage.
• C. An ongoing air leak in the system or pleural space.
• D. The collection chamber is full.

Answer: (C)

Continuous bubbling in the water-seal chamber means there is an ongoing air leak from the pleural space or the chest-tube system. The water seal acts as a one-way valve, so air escaping from the chest will bubble through the water. If the bubble stream is constant, air is continually leaking rather than only during breaths or coughing, indicating a persistent leak. This is different from normal intermittent bubbling that can occur with coughing or exhalation, or from no bubbling at all when there’s no active leak. A blockage in drainage or a full collection chamber wouldn’t produce continuous bubbling in the water-seal chamber; they tend to cause little or no bubbling or other drainage problems. In practice, look for secure connections, ensure the tube isn’t kinked or dislodged, assess lung expansion, and escalate care if bubbling remains continuous or the patient’s condition worsens.