Are the long term effects of radiofrequency ablation known yet?

Yes, there are none: Ablation has been around since the late 1980s. Thousands of patients have been treated for a variety of differrent rhythm problems with this technique. There are no proarrhythmic effects or other long-term negative consequences. Any given procedure may be associated with complications.

No: No major side effects have been brought to light from radiofrequency ablation procedures except for some numbness in the area that may persist.