No Lillian, I don't have a pacemaker. For a catheter ablation, a catheter is threaded through a sheath that is placed in each of the femoral veins. The catheters are threaded up to the right atrium. In order to get to the left atrium, a small hole is poked in the septum dividing the right and the left atria. Then, in the area where the pulmonary veins enter into the left atrium, the heart fibers are stimulated to see if they fibrillate. Those that do are oblitereated with radiofrequency energy. The procedures are usually performed by cardiologists who have specialized in electrophysiology. My procedure took 4 1/2 hours. Doesn't that sound like fun???!!!