Double ventricular response via dual atrioventricular nodal pathways resulting with nonreentrant supraventricular tachycardia and successfully treated with radiofrequency catheter ablation

We report a patient with a complex nonreentrant supraventricular tachycardi a because of double ventricular response resulting from antegrade dual atri oventricular (AV) nodal pathways. We could induce double ventricular respon se and confirm dual AV nodal pathways by AV simultaneous pacing during basi c stimulation proceeding with programmed atrial single extrastimulation. As far as we know, it is the first report about the application of the AV sim ultaneous basic stimulation to prove the sustained nonreentrant tachycardia because of simultaneous conduction over dual AV nodal pathways. This was a lso confirmed by absence of the arrhythmia immediately after the eliminatio n of the slow pathway conduction by radiofrequency ablation.