A 53-year-old man with a history of IV drug abuse（滥用） is admitted to the ICU after a Whipple procedure. He regularly（有规律地） takes methadone（盐酸美沙酮）. Acutely, he takes hydromorphone（氢吗啡酮） for acute analgesia（疼痛缺失） and antibiotic prophylaxis（预防性） with cefazolin（头孢唑啉）. The QTc from the morning 12-lead ECG is 510 ms. Later that morning, the rhythm shown below is observed.
Which of the following is the most appropriate（恰当地） next intervention?
A. Discontinue methadone.
B. Continue all current drugs and monitor ECG twice daily.
C. Start amiodarone（胺碘酮）.
D. Administer bicarbonate（碳酸氢盐）.
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