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8. A 33-year-old woman develops severe hypoxemic respiratory failure as a complication of pneumonia and is treated with mechanical ventila- tion. The inspired oxygen concentration is increased to 100% shortly following intubation, and an arterial blood sample gives the following results: pH 7.32, Pco2 34, Po2 70 mm Hg, and HCO3-16. Which of the following mechanisms is likely to be responsible for the patient's hypoxemia?A. HypoventilationB. Diffusion impairmentC. Ventilation-perfusion inequalityD. ShuntE. Hypoventilation and ventilation-perfusion inequality

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