A 40s M arrives by EMS after being struck by a car. Per witnesses, the patient ran out between two cars, was struck by the mirror, knocked down, and got up and ran back to the sidewalk. EMS reports an initial sBP of 80 in the field. On arrival, he complains of left shoulder pain. His vitals are normal with a HR of 95, RR 12, BP 110 / 70. His physical exam is normal. There is no shoulder injury; he moves the shoulder perfectly well. IV access is obtained. Ten minutes later, his sBP is noted to be 60. The patient appears well and the exam remains normal with good breath sounds, non-tender chest wall, non-tender abdomen. What do you do?
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