If tidaling is absent, what is the recommended next step to assess lung status?

• A. Immediately remove the chest tube.
• B. Increase suction to maximum power.
• C. Clamp the chest tube to check for leakage.
• D. Correlate with imaging to assess lung status.

Answer: (D)

Tidaling reflects movement of air in the chest tube with breathing, so when tidaling is absent it does not by itself tell you what the lung is doing. The safest and most informative next step is to correlate with imaging to assess lung status. A chest radiograph (and sometimes ultrasound) can show whether the lung has re-expanded, whether there is a residual or recurrent pneumothorax, and whether the chest tube is in the correct position. This objective view guides what to do next.

Reasons the other options aren’t appropriate right away: removing the chest tube on the basis of absent tidaling could precipitate a pneumothorax if the pleural space still needs drainage. Increasing suction to maximum can risk tissue injury and does not provide a true assessment of lung status. Clamping the chest tube to check for leakage can be dangerous, as it may precipitate air or fluid buildup and doesn’t reliably inform lung status without imaging.