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An 83 year-old M presents with vomiting and diarrhea with intermittent abdominal pain. Vitals at triage include: T 37.2 HR 72 BP 145/62 SpO2 99%. Past medical history includes Hypertension, Dyslipidemia, Atrial Fibrillation and Type 2 Diabetes. Medications include Amlodipine, Metoprolol, Atorvastatin and Metformin. POCUS demonstrates a 2.5 cm diameter aorta and no intra-abdominal free fluid is seen. Labwork including CBC, electrolytes, glucose, renal function, and liver function tests is grossly normal apart from a Lactate of 4.3. Which of the following is the MOST APPROPRIATE next step?