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Review Question - QID 215093

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QID 215093 (Type "215093" in App Search)
A 68-year-old man presents with cramping abdominal pain and diarrhea. He states that he feels weak and lightheaded and almost fainted while walking today. He has a history of atrial fibrillation and takes metoprolol and apixaban. His temperature is 99.0°F (37.2°C), blood pressure is 96/60 mmHg, pulse is 131/min, and respirations are 18/min. Physical exam reveals a pale man who becomes lightheaded when sitting up. His abdomen is nontender. During the exam, the patient has a profuse bowel movement which appears like black diarrhea. A point-of-care hemoglobin is 10 g/dL. Which of the following is the most appropriate next step in management?