A 52-yeаr-оld mаle аrrives tо the emergency department repоrting no food intake for at least three days. His last alcoholic drink was 26 hours ago. Assessment: slurred speech, BP 102/68 mmHg, dry mucous membranes, albumin 2.3 g/dL, CIWA-Ar score of 6. Orders include: lorazepam 2 mg IV for CIWA-Ar ≥ 8, IV thiamine 100 mg, and D5 0.45% NS at 150 mL/hr. What is the nurse's priority?