What is the primary mechanism of action of oxygen therapy?

What is the primary mechanism of action of oxygen therapy?

• A. Bronchodilation
• B. Reverse hypoxia
• C. Vasodilation
• D. Anemia correction

Answer: (B)

The main idea is that oxygen therapy works by relieving tissue hypoxia. By delivering higher fractions of inspired oxygen, arterial oxygen tension (PaO2) increases and more oxygen is carried in the blood both dissolved in plasma and bound to hemoglobin. This boosts overall oxygen delivery to tissues, helping to reverse hypoxia that stems from lung problems, shock, or airway compromise. Bronchodilation is produced by inhaled bronchodilators, not by oxygen itself, so simply giving oxygen doesn’t directly open airways. Vasodilation isn’t the primary goal or mechanism of oxygen therapy, and while oxygen may influence certain vessels in specific situations, that’s not how it mainly works to improve patient status. Anemia correction refers to increasing the blood’s capacity to carry oxygen by raising red blood cell count or hemoglobin; oxygen therapy does not fix the underlying lack of hemoglobin, it mainly improves the amount of oxygen available to tissues despite that limitation.

The main idea is that oxygen therapy works by relieving tissue hypoxia. By delivering higher fractions of inspired oxygen, arterial oxygen tension (PaO2) increases and more oxygen is carried in the blood both dissolved in plasma and bound to hemoglobin. This boosts overall oxygen delivery to tissues, helping to reverse hypoxia that stems from lung problems, shock, or airway compromise.

Bronchodilation is produced by inhaled bronchodilators, not by oxygen itself, so simply giving oxygen doesn’t directly open airways. Vasodilation isn’t the primary goal or mechanism of oxygen therapy, and while oxygen may influence certain vessels in specific situations, that’s not how it mainly works to improve patient status. Anemia correction refers to increasing the blood’s capacity to carry oxygen by raising red blood cell count or hemoglobin; oxygen therapy does not fix the underlying lack of hemoglobin, it mainly improves the amount of oxygen available to tissues despite that limitation.