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10. A 52 year-old man with a history of coronary artery disease and heavyhistory of smoking presents to the emergency department with 2 daysof dyspnea, fever, and a cough productive of rust-colored sputum.Arterial blood gases are performed upon arrival in the emergencydepartment and after being placed on supplemental oxygen. The resultsare as follows:FIO2 pH PaCO2 PaO2 HCO3−0.21 7.48 32 51 230.80 7.47 33 55 23What is the predominant mechanism(s) of his hypoxemia?A. HypoventilationB. Ventilation-perfusion inequalityC. ShuntD. Hypoventilation and ventilation-perfusion inequalityE. Diffusion impairment
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