Which finding might suggest a chest tube is malpositioned?

• A. Rapid improvements with full lung expansion and heavy drainage.
• B. Absence of drainage with persistent symptoms or poor lung expansion; imaging should confirm position.
• C. Immediate lung collapse after placement with heavy drainage.
• D. Normal drainage and excellent lung expansion.

Answer: (B)

When a chest tube is placed and functioning correctly, you should see drainage and the lung re-expand. The finding that best signals malposition is no drainage despite ongoing symptoms or poor lung expansion, because the tube may not be in the pleural space or could be blocked. In this situation imaging is needed to confirm the tube’s exact location and determine if repositioning is required.

By contrast, rapid improvement with full lung expansion and heavy drainage, or normal drainage with excellent expansion, point to proper placement and function. If the lung collapses immediately after placement but there is heavy drainage, that scenario would prompt immediate reassessment, but it is not the primary sign of malposition described here.