Can anyone out there throw any light onto why, two weeks post AV ablation, I am still so prone to exhaustion. I am off all medication except Warfarin. If I exert myself, just moderately, I get very quickly out of breath and very shaky. A couple of times, this has been almost to the point of collapse. My pulse never seems to change from the 80 bpm that it registered immediately post-op. Is it possible that I am becoming so exhausted because my pacemaker has been programmed not to go any higher than 80 bpm? I find it so strange that my pulse always remains the same, whether I am resting with my feet up or struggling up a flight of stairs, although I am otherwise affected so differently. I am in France at the moment so I am unable to query this with the UK cardiology department who did the ablation.