26 A 75-year-old man who lives alone in a poorly ventilated house without central heating uses...

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26 A 75-year-old man who lives alone in a poorly ventilated house without central heating uses a portable unventedkerosene heater to warm the house during the winter months. One morning, a neighbor finds him in an obtunded state. On physical examination, he appears cyanotic. Results of blood gas measurement on room air are Po2, 90 mm Hg; Pco2, 35 mm Hg; and pH, 7.3. Pulse oximetry shows low oxygen saturation. Exposure to which of the following is most likely to have produced this man's illness? □ (A) Beryllium (B) Carbon monoxide □ (C) Nitrous oxide compounds □ (D) Oxygen □ (E) Ozone □ (F) Polycyclic aromatic hydrocarbons (G) Sulfur dioxide 26 A 75-year-old man who lives alone in a poorly ventilated house without central heating uses a portable unventedkerosene heater to warm the house during the winter months. One morning, a neighbor finds him in an obtunded state. On physical examination, he appears cyanotic. Results of blood gas measurement on room air are Po2, 90 mm Hg; Pco2, 35 mm Hg; and pH, 7.3. Pulse oximetry shows low oxygen saturation. Exposure to which of the following is most likely to have produced this man's illness? □ (A) Beryllium (B) Carbon monoxide □ (C) Nitrous oxide compounds □ (D) Oxygen □ (E) Ozone □ (F) Polycyclic aromatic hydrocarbons (G) Sulfur dioxide