Why might severe COPD be considered a relative contraindication to HBOT?

• A. Because COPD is not related to HBOT safety and has no special considerations.
• B. Because of potential CO2 retention, ventilation-perfusion mismatch, and hemodynamic stress; requires careful assessment.
• C. Because HBOT delivers insufficient oxygen in COPD due to lung changes.
• D. Because COPD patients always tolerate HBOT well.

Answer: (B)