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Figure 4 Patient 27. (A) Induction of a sustained AV reentrant tachycardia following the administration of 10 mg ATP in a patient with a concealed left free wall AP. About 10 s after the ATP bolus, tachycardia is initiated during stable sinus rhythm (cycle length 540 ms). Note a slight and progressive prolongation in PR interval preceding the tachycardia initiation. The right bundle branch block present is catheter-induced. (B) After radiofrequency ablation of the AP, no tachycardia is induced 10 s after administration of the same dose of ATP and achievement of sinus cycle length and PR interval similar to baseline.
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