What indicates a normal functioning chest tube?

• A. Constant bubbling in the water-seal chamber
• B. Intermittent bubbling in the water-seal chamber
• C. No change in the drainage color
• D. Fluid continually draining with no air leaks

Answer: (D)

The indication of a normal functioning chest tube is fluid continually draining with no air leaks. This reflects that the tube is effectively allowing pleural or mediastinal fluids to drain, which can help reduce pressure and prevent complications such as pneumothorax. The lack of air leaks signifies that the system is intact and functioning as intended, ensuring that no atmospheric air is entering the pleural space, which could lead to lung collapse.

In contrast, constant bubbling in the water-seal chamber typically suggests an air leak from the system, indicating that the chest tube may not be functioning properly. Intermittent bubbling can be normal during respiration or drainage but can also indicate fluctuations in pleural pressure if it is persistent. Lastly, while having no change in the drainage color could be considered a positive sign, it does not provide a complete picture of tube function compared to ensuring continuous fluid drainage without air leaks.