Just my $0.02 worth of info: Before becoming a PM dependent, A-V node ablated dude, I had this experience: First 3 atrial ablations - by TCAI - failed. 4th try in June 2011 appeared sucessful. 7 months later, I developed a NSR 125 bpm heart rate. Contacting my EP @ TCAI resulted in a return phone call by his nurse asking, "How do you feel?" I felt OK, but I knew things weren't right. EP and his companion Doc from St. David's Healthcare made no real effort to treat my tachy condition for nearly 4 months. Early May 2012, big time A-Fib event erupted, and I went for the A-V Node ablation. Every cardiologist/heart failure Doc. I've visited since that time have stated basically the same thing: "You know, that TCAI EP who ignored your condition is the major cause of you developing heart failure. It's known as Tachycardia Induced Cardiomypathy. It's completely treatable when caught early."