Hi Becky , I can't say I've heard that term exacting like your saying it , what I was told was I have hundreds of pathways that are basically rogue as they grew by themselves and don't belong there. And when they would go in and try and map the ones affecting the pacing of my heart. When they found a pathway that was causing an issue they would ablate it with either freezing or heat to shut off that path. Now I had so many their wasnt always time to find them all and also some were in places where they could not reach so ultimately the transplant was needed. So it may just be terminology but what your describing does sound similar. I know one doctor said I could have had over a thousand . The last effort they had was to try an MRI which typically can't be done with a pacemaker , since the magnetic waves would bounce off of it and make it hard to see what they wanted to see. Plus I was in a state that shutting off the pacemaker which was required ment a whole team of both Cardiologist and The techs for the pacemaker company were in the room during it. They tried for a few hours to try and determine where the bad paths were but it was unsuccessful. All I know is Mayo is a great place to be when you have the tought cases. And mine sure had them trying everything. So my doctors usually used terms like bad paths and I guess rougue could be a term to describe them also.