After changing the FiO2 of a patient with emphysema, how long ...

[PhilipSeeMore]

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

Question 2

The shape of the expired CO2 tracing of a patient is normal but instead of being zero, the baseline is elevated to approximately 12 mm Hg. Which of the following is the most likely problem?
 
  a. Patient disconnected from the system
  b. Obstruction of the sampling tube
  c. Rebreathing
  d. Presence of N2O

[kingfahad97]

Answer to Question 1

ANS: C
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 ex-change status within 5 min in healthy people but may require 20 to 30 min in patients with COPD.

Answer to Question 2

ANS: C
An elevated baseline (higher than 0 mm Hg) indicates rebreathing.

[PhilipSeeMore]

Thank you

[kingfahad97]

Happy to help you