In a COPD patient requiring oxygen therapy, how should oxygen be titrated to avoid CO2 retention?

• A. Keep O2 at 100% regardless of saturation.
• B. Maintain the prescribed target saturation (often 88-92%), adjust gradually with physician orders, and monitor ABGs as needed.
• C. Titrate based on patient subjective comfort only.
• D. Stop oxygen therapy as soon as patient reports relief.

Answer: (B)

In COPD, the goal of oxygen therapy is to correct low oxygen levels without tipping the balance toward CO2 retention. The safest approach is to keep oxygen within a prescribed target saturation, often around 88–92%, and adjust the flow gradually under physician orders while closely monitoring the patient’s oxygenation with SpO2 and, if needed, arterial blood gases. This ensures adequate oxygen delivery while avoiding excessive oxygen that can suppress ventilation in some patients.

Giving oxygen at 100% can worsen CO2 retention in chronic CO2 retainers by blunting the hypoxic drive and increasing ventilation-perfusion mismatch, so high-flow or unidirectional high oxygen is avoided unless specifically directed by a clinician. Oxygen therapy should be guided by objective data, not subjective comfort alone; changes should be made based on target saturations and ABG results when indicated, with continuous monitoring. Stopping oxygen because the patient feels relief could leave them hypoxemic, and handling oxygen purely by comfort or on/off relief is not appropriate.