An 87 y.o. female patient presents to the emergency room with change in mental status. Labs: WBC 10.5, Platelets 147, BUN 21, Creatinine 0.9, Na 125, glucose 103. She currently takes lisinopril with hydrochlorthiazide 10/12.5 mg per day and aspirin 81 mg daily, Physical exam: confusion, lethargy, peripheral edema 3+ pitting. You suspect SIADH. What would be an appropriate treatment approach for this patient (choose all that apply)?

A. Fluid restriction
B. 2 liter NS bolus
C. Workup for diabetes
D. Close monitoring of serum sodium to avoid correcting hyponatremia too rapidly due to risk of central pontine myelinolysis.
E. Nephrology consult