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Review Question - QID 210519

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QID 210519 (Type "210519" in App Search)
A 66-year-old man presents to the emergency department for a cough and fatigue. The patient was brought in by his home nursing aid stating that he seemed confused for the past day. The patient has a medical history of diabetes and hypertension. He is currently taking insulin, metformin, lisinopril, and atorvastatin. His temperature is 102°F (38.9°C), blood pressure is 107/63 mmHg, pulse is 120/min, respirations are 15/min, and oxygen saturation is 98% on room air. Physical exam reveals crackles on pulmonary exam and S4 on cardiac auscultation. Lung imaging is pending. Which of the following is the most appropriate next step in management?