"secondary source: aha acls tachyarrhythmias (most recent)" MCQ (SBA): Atrial Fibrillation with Pre-excitation

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Moderate"D"Atrial Fibrillation with Pre-excitation"secondary source: aha acls tachyarrhythmias (most recent)"

A 64-year-old with AF (rate 150) and pre-excitation (irregular wide-complex tachycardia with delta waves on prior ECG) is unstable. Which therapy is contraindicated acutely?

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