Radiofrequency Catheter Ablation of Typical Atrial Flutter:To Compare the Effects of Posterior Isthmus Ablation Method and Septal Isthmus Ablation Method

The purpose of this study is to compare the effects of radiofrequency ablation posterior isthmus and septal isthmus for typical atrial flutter.Fortyone patients with typical atial flutter were randomly assigned to undergo radiofrequency catheter ablation with the posterior isthmus ablation line (PI group,eighteen patients) or sepal isthmus ablation line (SI group,twentythree patients).Radiofrequency energy was used to create linear lesion from tricuspid ring to inferior vena cava in PI group and from tricuspid ring to Eustachian ridge in SI group,respectively.The endpoint of successful ablation included inability to induce atrial flutter and complete bidirectional conduction block at isthmus.The endpoint was achieved in forty patients (97.6%) without any complication.The ablation line had to change for three patients in PI group and two patients in SI group after the primary ablation line was unsuccessful.The numbers of radiofrequency application and procedure time were not significantly different in both groups.During a mean followup of 12.4±6.8 months,two patients (PI group) experienced atrial flutter recurrence.Radiofrequency ablation of the typical atrial flutter was safe and effective with either the poterior isthmus ablation technique or the septal isthmus abaltion technique.The ablation success rate can be incresed when these two ablation methods are used supplementally with each other.[Chinese Journal of Cardiac Pacing and Electrophysiology,2000,14(2):101～103] Atrial flutter Isthmus Catheter ablation,radiofrequency current