A 72-year-old client is admitted with hyponatremia and is started on an infusion of 3 After four hours, the nurse notes that the client's blood pressure has increased to 156/92 mm Hg, respiratory rate is 24/min, and oxygen saturation is 91 On physical assessment, the nurse hears new-onset crackles in the lower lung fields and observes +2 pitting edema in both ankles. The client appears restless and mildly confused, has a urine output of only 200 mL over the last four hours, and has gained 1.2 kg (2.6 pounds) since admission. Which of the following actions should the nurse take?