A 40-year-old man in the intensive care unit (ICU) was noted to have red urine. Eight hours earlier, he had been found unconscious in a fume-filled car. Cardiopulmonary resuscitation had been initiated for asystole, which resulted in the return of spontaneous circulation. Endotracheal intubation was performed and he received treatment for inhalation of car fumes. Which of the following is the most likely cause of this patient’s red urine?
一位40岁的男性患者在重症监护病房（ICU）中被发现尿液呈红色。8小时前，他被发现在充满烟雾的车内昏迷。当时因心室停搏进行了心肺复苏，并成功恢复了自主循环。随后进行了气管插管，并接受了吸入汽车烟雾的治疗。以下哪项最可能是该患者尿液发红的原因？
A. Hematuria血尿
B. Hydroxocobalamin-induced discoloration氢钴胺引起的变色
C. Myoglobinuria肌红蛋白尿
D. Porphyria卟啉症
E. Rifampin-induced discoloration利福平引起的变色
答案解析：
为预防吸入汽车烟雾可能导致的氰化物中毒，已开始静脉注射5克氢钴胺。诊断结果显示，尿液变色是由氢钴胺引起的——这是该解毒剂的一种良性副作用，可能会持续数天到数周。4天后，患者从重症监护病房（ICU）出院，接受精神评估。
正确答案：B
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