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General Medicine General 92e34638

Which of the following is true to the immediate postoperative period in a young patient with previously normal lungs having upper abdominal surgery ?

A
Arterial oxygen tension will typically be reduced by an average of 10 mm Hg when breathing room air
B
Arterial oxygen tension will normalize after 15 minutes
C
Diffusion hypoxia is the major determinant of arterial hypoxaemia
D
The CXR will typically reveal no abnormalities

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