Incidence and location of Marked Low Voltage (MLV) areas acquired with Circular catheters (CMC) AFocus and LassoNav, omnipolar catheter (OC) and multipolar catheter (MC). MLVareas were quantified as a percentage of the surface of each left atrial anatomical area analyzed,and were, in turn, calculated in square centimeters through the measurements yielded by the 3D mapping system used. The values are expressed as mean ±SD. B. Comparison between OC and MC.OC identified a significantly lower percentage of MLVthan MCin all the anatomical areas analyzed, with the exception ofthe LW. AW=anterior wall; IW=inferior wall; LW=lateral wall; PW=posterior wall; SW=septal wallFig. 6. Kaplan–Meier estimation of the time to atrial fibrillation recurrence