Double retrograde atrial response after radiofrequency ablation of typical AV nodal reentrant tachycardia.

A double ventricular response resulting from a single atrial depolarization conducting down dual atrioventricular (AV) nodal pathways has been pt^viously well characterized.' "̂ However, a double atrial response as a result of a single ventricular depolarization conducting across dual retrograde AV nodal pathways has not been well described.^'' This case report describes a patient in whom a single ventricular depolarization resulted in a double atrial response and tbe initiation of atypical AV nodal reentiTUit tachycardia after successful radiofrequency ablation of typical AV nodal tieentrant tachycardia using the slow pathway approach.