Highlighting region for re-ablation

An apparatus for assessment of a lesion formed between first and second regions of tissue in a body cavity, the apparatus comprising:

• a first medical probe comprising a first electrode;
• a second medical probe comprising multiple second electrodes;
• a display;
• and
• a processor configured:
• to apply to or to sense from the first electrode in contact with the tissue at a stimulus location in the first region, a first activation signal having a first activation peak at a first time,
• to receive, from the second electrodes in contact with the tissue at respective sensing locations in the second region, respective second activation signals having respective second activation peaks sensed by the electrodes following the first activation signal,
• to identify, based on a temporal relation between the first and second activation peaks and a spatial relation between the stimulus location and the sensing locations, one of the multiple electrodes proximal to a gap in the lesion, and
• to present, on the display, a map of the body cavity with the identified electrode marked on the map.

A computer software product for assessment of a lesion formed between first and second regions of tissue in a body cavity and operated in conjunction with first and second medical probes for insertion into a body cavity, the product comprising a non-transitory computer-readable medium, in which program instructions are stored, which instructions, when read by a computer, cause the computer

• to use the first probe in contact with the tissue at a stimulus location in the first region for applying to the tissue or sensing in the tissue a first activation signal having a first activation peak at a first time,
• to receive, from the second probe having multiple electrodes in contact with the tissue at respective sensing locations in the second region, respective second activation signals having respective second activation peaks sensed by the electrodes following the first activation signal,
• to identify, based on a temporal relation between the first and second activation peaks and a spatial relation between the stimulus location and the sensing locations, one of the multiple electrodes proximal to a gap in the lesion, and
• to display a map of the body cavity with the identified electrode marked on the map.