Objective : To compare posterior isthmus (inferior vena cava tricuspid annulus isthmus) ablation technique and septal isthmus (tricuspid annulus Eustachian ridge isthmus) ablation technique for typical atrialflutter- ...
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Objective : To compare posterior isthmus (inferior vena cava tricuspid annulus isthmus) ablation technique and septal isthmus (tricuspid annulus Eustachian ridge isthmus) ablation technique for typical atrialflutter- Methods :Thirty five patients ( mean age 53 ±15 years) with typical atrial flutter were randomly assigned to undergo radiofrequency catheter ablation performed with posterior isthmus ablation technique (PIgroup ,15 patients) or septal isthmus ablation technique (SIgroup ,20 patients)- Radiofrequency energy was used to create linear lesion from tricuspid ring to inferior vena cava in the PIgroup and from tricuspid ring to Eustachian ridge in the SIgroup- The ablation technique was changed to the other,if one of the ablation techniques failed to block the isthmus after eight applications of radiofrequency energy- The endpoint of successful ablation included a complete bidirectional conduction block atisthmus and inability to induce atrial flutter- Results : Atrialflutter was present atthe onset of ablation in 10 patients of the PIgroup and in 15 patients of the SIgroup , however the cycle lengths of atrialflutter between the two groups were 240 ±30 ms and 220 ±23 ms ( p < 0-05) ,respectively- The endpoint of successful ablation was achieved in all of the patients without any complication- The ablation technique was changed for two patientsin both groups afterthe primary ablation technique was unsuccessful- The times ofradiofrequency application and proceduretime were notsignificantly differentin both groups- During a mean follow up of 15-4 ±3-8 months ,one patient (PIgroup) experienced atrialflutter recurrence- Conclusion : Radiofrequency ablation oftypical atrialflutteris safe and effective with eitherthe posterioristhmus ablation technique orthe septal isthmus ablation technique- The ablation success rate can be increased when these two techniques are used alternatively-
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