A 45-year-old homeless man is admitted to the psychiatric ward for acute psychosis. His vital signs have been stable and he is eating well. On hospital day 3, he complains of shortness of breath. His blood pressure is 80/35 mm Hg, heart rate 165 beats/min respiratory rate 20 breaths/min and oxygen saturation 94% on 4 L/min nasal cannula. ECG reveals supraventricular tachycardia.
Which of the following is the most appropriate intervention at this time?
A. Metoprolol, 5 mg IV
B. Naloxone, 0.4 mg IV
C. Synchronized cardioversion
D. Verapamil, 2.5 mg IV
答案解析：
此时适合同步复律，因为他有症状、低血压且心律有序。美托洛尔和维拉帕米给药将使其低血压恶化。未提示使用纳洛酮治疗麻醉药过量。
正确答案：C
补充内容：心动过速
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