患者,男,20岁,大学生。因上呼吸道感染给以左氧氟沙星0.6 g避光静脉滴注,滴注时间约100 min,于上午11点30分滴完,患者轻微胸闷,未告知医生护士,返回家中后症状逐渐加重,于12点30分返回医院,痛苦面容,血压126/105 mmH g,心率103次/min,呼吸20次/min,体温36.7℃,双肺呼吸音粗,未闻及干湿性音,心律规整,未闻及杂音,立即给以吸氧20 min,症状、体征无改善,口服美托洛尔25 mg,继续吸氧, Patient, male, 20 years old, college student. Due to upper respiratory tract infection levofloxacin 0.6 g intravenous drip, drip time of about 100 min, at 11:30 dripping finished, patients with slight chest tightness, did not inform the doctor nurses, after returning home symptoms gradually aggravated at 12:00 30 minutes back to the hospital, painful face, blood pressure 126/105 mmH g, heart rate 103 beats / min, breathing 20 beats / min, body temperature 36.7 ℃, lung breath sounds coarse, no smell and dry and wet sound, And murmur, immediately give oxygen 20 min, no improvement in symptoms and signs, oral metoprolol 25 mg, continue to oxygen,