The patient is brought to the emergency room after briefly losing consciousness. He states, “I feel like my heart has been racing for days now. I just assumed it was stress, but now it feels so much worse.” He is pale, diaphoretic, and tachypneic. His heart rate is 118 bpm and his blood pressure is 86/52 mmHg. An electrocardiogram shows an irregularly irregular RR interval without distinct P waves. The nurse prepares the patient for which intervention? 

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