Question:
Oxygen therapy may NOT be useful (and may be harmful) in:
Oxygen therapy may NOT be useful (and may be harmful) in:
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Oxygen worsens oxidative lung injury states.
Updated On: Jun 24, 2026
- Asthma
- Pneumonia
- Subglottic stenosis
- Pulmonary fibrosis
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The Correct Option is D
Solution and Explanation
Step 1: Although many protocols say oxygen should not be withheld from any patient, certain situations are known to do harm with oxygen therapy.
Step 2: These include paraquat poisoning, pulmonary fibrosis, and lung damage from bleomycin treatment, where high oxygen tension can worsen oxidative lung injury. So pulmonary fibrosis (option 4) is the answer.
Step 3: In asthma and pneumonia, supplemental oxygen relieves hypoxaemia and is clearly beneficial, and in subglottic stenosis oxygen supports gas exchange while the airway obstruction is addressed.
Step 4: Therefore the condition where oxygen may not be useful, and can be detrimental, is pulmonary fibrosis.
Step 2: These include paraquat poisoning, pulmonary fibrosis, and lung damage from bleomycin treatment, where high oxygen tension can worsen oxidative lung injury. So pulmonary fibrosis (option 4) is the answer.
Step 3: In asthma and pneumonia, supplemental oxygen relieves hypoxaemia and is clearly beneficial, and in subglottic stenosis oxygen supports gas exchange while the airway obstruction is addressed.
Step 4: Therefore the condition where oxygen may not be useful, and can be detrimental, is pulmonary fibrosis.
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