CFAE/spatiotemporal dispersions procedural details: To increase the accuracy of CFAE mapping, the Pentaray mapping catheter will be used to define spatiotemporal dispersion areas of CFAEs as specific targets of ablation as described by Seitz (see also citation) as follows. Dispersion areas are defined as clusters of electrograms, either fractionated or non-fractionated, that display interelectrode time and space dispersion at a minimum of 3 adjacent bipoles such that activation spread over all the AFCL. At each bipole in a dispersion area, one or more of the following fractionated or nonfractionated electrogram morphologies can be found: