You are receiving report on a 12-year-old patient with Crohn's disease. Over the past 24 hours, the patient has shown the following changes: Weight loss of 1.2 kg Baseline heart rate increased from 110 to 138 bpm Blood pressure decreased from 100/64 to 82/50 mmHg Temperature increased from 37.8°C to 39.4°C 8 bloody diarrheal stools in past 12 hours What is the nurse's priority?