The patient presents to the emergency department complaining of lightheadedness and states, “I feel like my heart is racing.” Upon assessment, the nurse notes the patient is diaphoretic and pale. Vital signs are significant for a heart rate of 220 bpm, blood pressure of 70/50 mm Hg, and oxygen saturations of 96%. The 12-lead EKG indicates supraventricular tachycardia. Which medication does the nurse prepare to administer?

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