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, and means for determining the continuity of the isolation line formed by the plurality of lesions is disclosed. And a method for determining the continuity of an isolation line in a region of a human heart is disclosed, comprising configuring a processor to receive data from a position sensing device during the forming of a plurality of lesions, the received data being indicative of a sensed location of the plurality of lesions substantially along a desired ablation line, determine if a jump occurred between each consecutively formed pair of lesions of said plurality of lesions, said jump being defined by a predetermined criteria of spatial separation between said consecutively formed pairs of lesions, and increment a jump index for each jump detected in the formation of said plurality of lesions along the desired ablation line, and determine a probability of gap formation along said isolation line based on said jump index and force data associated with each of said consecutively formed pairs of lesions.
