Review Question - QID 204322

A 74-year-old man is brought to the emergency department from a nursing home due to decreased responsiveness. His caretaker adds that the patient has not been having fevers, chills, coughing, or changes in urination or stool. The patient's past medical history is significant for Alzheimer's disease, hypercholesterolemia, and hypertension. His medications include memantine, simvastatin, and hydrochlorothiazide. Vitals include T is 36.9 C, BP 104/68 mmHg, HR 100/min, and RR 16/min. After standing for 10 minutes, his blood pressure is 82/58 mmHg. On physical exam, he is a frail, elderly man, with dry oral mucosa. His skin examination is shown in Figure A. Cardiac exam reveals regular tachycardia and pulmonary auscultation is wiithin normal limits . Laboratory results are as follows:
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