a patient is admitted to the hospital after several days of vomiting and diarrhea. after an initial bolus of isotonic (0.9%) sodium chloride solution, the prescriber orders dextrose 5% in 1/2 normal saline (d5ns) with 20 meq potassium chloride to infuse at a maintenance rate. what should the nurse review before implementing this order? (select all that apply.) a. electrocardiogram b. arterial blood gas levels c. serum electrolyte levels d. serum glucose level e. urine output