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Triggering of AV nodal reentrant tachycardia (above) in a patient with undocumented episodes of palpitations. The esophageal electrogram (middle) shows fused atria and ventricular electrograms. The surface EKG during tachycardia is also diagnostic (see above, pseudo S waves in D2). The tachycardia is stopped by one esophageal stimulus (below).
