Search for: [Abstract = "Background and aim of the study\: 30% to 40% of patients \(pts\) have chronic AF before mitral valve operation. In the most pts AF will persist after procedure. In this study a radiofrequency \(RF\) ablation was performed. Material and methods\: two groups were analyzed\: RF group–50 pts with mitral valve replacement and ablation, Control group–50 pts with mitral valve replacement. The Student’s t\-test and Chi2 test were used. Results\: the groups were compared according to\: age, gender, EF, LA size, the grade of heart insufficiency , the type of mitral valve’s dysfunction and the history of embolic events. The differencies were insignificant. Aortic crossclamp time was longer in RF group \(p<0.001\). The pacemaker was implanted in 4 pts from RF group and in 1 patient from the second one. Cardioversion was performed less frequently and with better results in RF group \(p=0,002\). After one year the average size of LA was lower in pts with sinus rhythm than in pts with AF \(p=0.042\). EF was higher \(p=0.016\). LA size > 6 cm 5\-fold at the discharge and 9.3\-fold after one year increased the risk of ablation failure than the small one \(LA<5cm\). NYHA class IV 36\-fold at the discharge and 37\-fold after 1 year increased the risk of AF preservation than NYHA class II. Conclusions\: 1. RF ablation statistically significantly restores sinus rhythm 2. LA size>6 cm and NYHA class IV are the most important risk factors for ablation failure."]

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