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A 54-year-old man presents to the emergency room complaining of progressive shortness of breath for 3 weeks. He has a long history of left sided heart failure treated by enalapril. Chest x-ray reveals bilateral pulmonary edema. After receiving the appropriate treatment, he is hospitalized for further investigations.
Which of these findings is most likely revealed after further investigations?
A- Normal arterial O2 partial pressure
B- Normal arterial CO2 partial pressure
C- Normal respiratory function tests
D- Decreased pulmonary artery pressure
E- Increased pulmonary venous pressure
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