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An 84-year-old man was admitted 2 hours ago with pneumonia. He answers questions with unrelated replies and looks at the nurse blankly. His daughter says he is "sharp as a tack" at home but wears hearing aids in both ears, which were left at home. Temperature 99.1°F (37.3°C), SpO2 95% on room air, blood glucose 112 mg/dL. Which action should the nurse take first?
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