Electrophysiological features and radiofrequency catheter ablation of atrioventricular nodal reentrant tachycardia with"no-jumping" atrioventricular nodal functional curves

Aim To explore the electrophysiological features and endpoint of radiofrequency catheter ablation(RFCA) in atrioventricular nodal reentrant tachycardia(AVNRT) withno-jumpingatrioventricular nodal function curves.Methods 75 patients with AVNRT were divided into three groups,group A(n=30):patients with no AH jump in atrioventricular nodal function curves(AVNFC),group B(n=35): patients with a single AH jump in AVNFC,group C(n=10): patients who recurred AVNRT after RFCA.After ablation in the zone of slow pathway,electrophysiological parameters were compared with those before and after ablation among three groups.Results AV node Wenckebach cycle length(AVNWCL) were prolonged(both P0.01),and PR/RR during rapid atrial pacing at the maximum rate of sustained 1∶1 AV conduction decreased from more than 1.0 to less than 1.0 after ablation in group A and group B(both P0.01).Although AVNWCL was prolonged and PR/RR decreased from more than 1.0 to less than 1.0 in group C,there was no statistic significance(P0.05).In group C the total number of junctional ectopy was significantly less than that in group A and group B(P0.01).Conclusions When performing radiofrequency catheter ablation in atrioventricular nodal reentrant tachycardia with no-jumpingatrioventricular nodal function curves,a significant prolongation of AVNWCL,PR/RR during rapid atrial pacing at the maximum rate of sustained 1∶1 AV conduction decreased from more than 1.0 to less than 1.0,and a much larger number of junctional ectopy can be regarded as an indicator of successful ablation.