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A 30-year-old woman with no significant past medical history presents to the emergency department stating that her heart has been racing for the past 4 hours. She denies experiencing any chest pain, shortness of breath, weakness, or confusion. Her vital signs are as follows: T 99F, HR 180, RR 14, BP 130/85, SaO2 100%. Her physical exam is normal aside from obvious tachycardia on cardiovascular exam. Her EKG is shown in Figure A, and it remains unchanged after Valsalva maneuver. Which of the following drugs should be administered at this time?
Fentanyl followed by synchronized cardioversion
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