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A 19-year-old man is thrown from his motorcycle at highway speed. On arrival he is alert and complains only of neck pain. His blood pressure is 78/44 mmHg and his heart rate is 52/min. He cannot move either leg. The skin of both legs is warm and dry, capillary refill is two seconds, and his penis is persistently erect. He is afebrile, there is no rash, the jugular venous pressure is normal and the lungs are clear. The abdomen is soft, the pelvis is stable and focused ultrasound shows no free fluid. Which one of the following best explains this man's hypotension?
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