How can pulmonary oxygen toxicity be prevented?

• A. Limit exposure to high oxygen levels
• B. Prolonged exposure to high oxygen
• C. Use higher oxygen concentrations at all times
• D. Avoid monitoring

Answer: (A)

Pulmonary oxygen toxicity is driven by how much oxygen you breathe and for how long—the lungs suffer more oxidative damage when high inspired oxygen levels are sustained. The prevention goal is to minimize the oxygen dose to the lungs: use the lowest FiO2 necessary to achieve adequate oxygenation and limit the time you’re exposed to high oxygen. By keeping exposure brief and at the lowest effective concentration, you reduce the production of harmful reactive oxygen species and protect the alveolar and capillary structures from injury.

Prolonged exposure to high oxygen accelerates damage, using higher oxygen concentrations all the time wastes safety margins and increases risk, and avoiding monitoring removes essential feedback to keep exposures within safe limits.