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6. A 46-year-old man is hospitalized after being rescued from a fire in afurniture warehouse. He was short of breath and dizzy on initial evalua-tion but now has a decreased level of consciousness. His arterial oxygensaturation is 99% while receiving supplemental oxygen. A chest radio-graph shows no focal opacities while an electrocardiogram shows only arapid heart rate. On laboratory studies, his arterial Po2 is 200 mm Hg,hemoglobin is 15 g·dl−1, and he has an elevated lactic acid level. A pul-monary artery catheter is placed, and the mixed venous oxygen satura-tion is found to be 85%. Which of the following most likely accountsfor the patient's clinical condition?A. CarboxyhemoglobinemiaB. Cyanide intoxicationC. Hypovolemic shockD. MethemoglobinemiaE. Pulmonary edema

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