A patient presents with palpitations and the ECG shows a narrow-complex tachycardia at 160 bpm with no visible P waves. Vagal maneuvers are ineffective. What is the next treatment?
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A
Amiodarone 150 mg IV over 10 minutes
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B
Adenosine 6 mg rapid IV push
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C
Diltiazem 0.25 mg/kg IV
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D
Synchronized cardioversion at 50 J