A patient has a tumor blocking the left mainstem bronchus. What additional factor would favor the development of atelectasis?
a. Breathing a nitric oxide mix (iNO)
b. Breathing a helium/oxygen mix (heliox)
c. Breathing a high percentage of oxygen
d. Breathing a low percentage of oxygen
C
Alveolar degassing can occur if the patient has inhaled a high oxygen percentage and the bronchus is then blocked. When all of the oxygen is absorbed from the alveoli, they will develop atelectasis.
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