What factor is essential when considering HBOT for a patient with COPD to ensure safety?

• A. Careful assessment for CO2 retention and ventilation-perfusion mismatch.
• B. Proceed with standard protocol without assessment.
• C. Exclude all COPD patients from HBOT.
• D. Limit HBOT to one session only.

Answer: (A)

The safety hinge in COPD when considering HBOT is how the lungs handle gas exchange under high oxygen and pressure, specifically CO2 retention risk and ventilation-perfusion mismatch. COPD patients often have regions of the lung that are well perfused but poorly ventilated, creating a V/Q mismatch, and many have chronic CO2 retention. Exposing them to 100% oxygen at elevated pressure can worsen hypercapnia because the hyperoxic environment can reduce the respiratory drive in some patients and alter gas exchange dynamics, making it easier for CO2 to build up. If significant CO2 retention or severe V/Q mismatch is present, HBOT may be unsafe or require careful planning and close monitoring. This is why a thorough assessment of CO2 retention and gas-exchange status is essential before initiating HBOT in COPD patients.