Which aspect should be checked to ensure proper function of the chest drainage system?

• A. The water level in the chest tube operating system
• B. The patient’s blood pressure
• C. The room temperature
• D. The tubing length

Answer: (A)

The key idea is that the water level in the suction-control (wet) portion of the chest drainage system sets the suction and maintains the water seal that keeps air from flowing back into the chest. When the water level is at the prescribed mark, the system delivers the intended negative pressure and preserves a seal between the pleural space and the atmosphere. If the level is too low, suction weakens or stops, reducing drainage. If it’s too high, suction can become excessive and potentially harm tissue. Regular checks should confirm the water level is correct and that there are no leaks or kinks, with attention to normal drainage behavior. Other factors like the patient’s blood pressure, room temperature, or tubing length do not directly dictate the drainage system’s function.