Using the same formula, what is the FiO2 at 5 L/min?

Study for the Respiratory Therapy Test. Use flashcards and multiple choice questions, featuring hints and explanations. Prepare for your exam successfully!

Multiple Choice

Using the same formula, what is the FiO2 at 5 L/min?

Explanation:
The main idea is that FiO2 from a nasal cannula rises roughly with flow using the simple estimate FiO2 ≈ 0.21 + 0.04 × L/min. At 5 L/min, this gives 0.21 + (0.04 × 5) = 0.41, or about 41% oxygen. So the best answer is 0.41. In practice, this is a handy rule of thumb, though actual FiO2 can vary with how the patient breathes and how well the cannula fits.

The main idea is that FiO2 from a nasal cannula rises roughly with flow using the simple estimate FiO2 ≈ 0.21 + 0.04 × L/min. At 5 L/min, this gives 0.21 + (0.04 × 5) = 0.41, or about 41% oxygen. So the best answer is 0.41. In practice, this is a handy rule of thumb, though actual FiO2 can vary with how the patient breathes and how well the cannula fits.

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