1. A system for forming an isolation line with a series of point contact lesions, comprising: means for forming a plurality of lesions by point contact ablation; means for determining the transmurality of the lesions of said plurality of lesions; means for determining the continuity of the isolation line formed by the plurality of lesions; and means for: determining the location of the most recently formed lesion with respect to a desired ablation line; and determining the location of the next lesion that will overlap with the most recently formed lesion based on the transmurality of the most recently formed lesion and the expected transmurality of the next lesion.