This case describes diagnostic maneuvers that will lead to an accurate diagnosis of a given A on V supraventricular tachycardia. The list of maneuvers described is not exhaustive but includes techniques to help diagnose a concealed NV/NF pathway mediated tachycardia that is in the differential diagnosis of a failed atrioventricular nodal re-entrant tachycardia ablation. The practicing electrophysiologist must be prepared to perform these maneuvers in order to ensure the safest and most focused ablation procedures.
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