A patient presents with a regular narrow-complex tachycardia at 160 bpm and is hemodynamically stable. Vagal maneuvers failed. What is the next appropriate treatment?
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A
Synchronized cardioversion at 50 J
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B
Adenosine 6 mg rapid IV push followed by 20 mL saline flush
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C
Amiodarone 150 mg IV over 10 minutes
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D
Verapamil 5 mg IV over 2 minutes