After changing the FiO₂ of a patient with emphysema, how long should you wait to draw an ABG to monitor the patient's respiratory status? A) 5 to 10 min B) 10 to 20 min C) 20 to 30 min D) 30 to 40 min

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Patients with healthy lungs achieve a steady state in only 5 min after changes, whereas those with chronic obstructive pulmonary disease (COPD) may require as long as 20 to 30 min. For example, if the patient's FiO₂ is changed, the measured PaO₂ will accurately reflect the patient's gas exchange status within 5 min in healthy people but may require 20 to 30 min in patients with COPD.

After Changing the FiO2 of a Patient with Emphysema, How

After Changing the FiO₂ of a Patient with Emphysema, How