@wcuro I hope I don't tread on any toes, but I have to speak up because what you say you have been told, about the scar tissue, or what you think you understand about what was said to you, is not in keeping with my understanding. Before I go on, I have no medical training.

When an electrophysiologist ablates the endothelial lining of the left atrium to stop the heart from fibrillating, he does create lesions which will ultimately heal, but they spread out a bit and create, if done properly and thoroughly, a complete circle of scarring around the affecting focus or entry point....usually around the pulmonary vein ostia. Later, there will be other re-entrants, but those develop with time and are found on the coronary sinus, in the left atrial appendage, in the septum, and so on....

The scarring is indeed impervious to the signals that need to travel through/over the endothelial lining. The wave propagation of energy travels over the endothelial lining and makes the myocytes under them contract...which is what we need the atrium to do.

You say you were told that scarring that took place years ago, by design, is now working against your heart's purpose of launching needed signals? How can this be? Why didn't scarring placed where it is currently located not cause tachycardia within days or weeks of the valve repair? Something doesn't add up.....to my uneducated mind.

Again, I'm not a physician, and I'm just trying to marry up what I understand about scar tissue and its effect on endothelial transmission, and how scarring around a valve repair could possibly cause tachycardia many years later. It sounds to me like both of us, you and I, need more understanding and a more comprehensive explanation. From there, your question just expressed in your post above mine should become more obviously replied to.