The nurse is caring for a patient who has undergone major abdominal surgery. 4 hours post op Urine output 45 ml BP 120/80 mmHg HR 90 beats/min Weight 97.5 kg 24 hrs post op urine output 20 ml/hr for past 2 hours BP 100/50 mm Hg HR 110 beats/m Weight 99 kg According to the 4 hours post-op assessment data and the 24 hour assessment data, the nurse understands that the weight change corresponds to an