What is the recommended practice to prevent pulmonary oxygen toxicity?

• A. Avoid all oxygen entirely
• B. Use as much oxygen as possible
• C. Do not limit exposure
• D. Limit exposure to high oxygen levels

Answer: (D)

Pulmonary oxygen toxicity comes from lungs being exposed to high concentrations of oxygen for extended periods. The protective approach is to limit exposure to high oxygen levels, using the lowest FiO2 that still keeps oxygenation adequate and titrating down as soon as possible. This minimizes oxidative stress on the alveolar surfaces while still meeting the body's needs. Avoiding oxygen entirely isn’t practical, and using maximal oxygen or not limiting exposure would increase the risk of toxicity.