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A 68-year-old male smoker with a history of peripheral vascular disease and a below the knee amputation, presents to the emergency room with excruciating abdominal pain and vomiting for the last 6 hours. Vital signs are T 101.0 F HR 136 BP 150/96 RR 18 Sat 93% on room air. Abdominal exam shows a non-distended, exquisitely tender abdomen which the patient refuses to allow you to examine. While assessing peripheral pulses you note that they are irregular. A digital rectal exam is Guiac positive. Laboratory values are notable for a leukocytosis and a lactic acid of 6.8 mmol/L. An ECG is shown in Figure A. What is the next best step in diagnosis?
Diagnostic peritoneal lavage
Technetium-99 tagged RBC scintigraphy
Upper GI with follow through
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