In addition to these direct comparisons, other indirect evidences support catheter ablation rhythm control . In a recent meta-analysis, PVs isolation, linear lesions and ablation of fragmented potentials in left atrium, although with a relatively high need for repeated procedures, have proven not only to be safe but also effective in improving symptoms (related to both CHF and AF), LV function and maintaining SR. In fact, in this analysis, 60% of the patients with a left ventricular function below 35% at baseline improved to a value above this limit following AF ablation.