Q. A 35-year-old woman was brought to the emergency department by her husband for severe fatigue, muscle weakness, gait instability, and confusion over the past 24 hours. Her medical history shows that she has von Willebrand disease and is managed with desmopressin acetate (DDAVP) as needed. Her recent sickness was when she had continuous bleeding from her nose 3 weeks ago, which was controlled with 10 micrograms of intranasal desmopressin twice daily for almost a week. Her temperature is 99.8°F (37.6°C), heart rate is 100/min, respiratory rate is 16/minute, and blood pressure is 130/80 mm of Hg. On examination, she appears lethargic and disoriented. Neurological examination shows unstable gait and muscle strength testing reveals generalized weakness with decreased reflexes. What is the most appropriate next step in her management?