Before my heart's electrical system was destroyed with a drug--Armour Thyroid, I had good aerobic capacity. Now whatever I try to do I am breathing hard or out of breath. My 2 lead St. Jude PM is capped at 130 which is all the EP would give me. I use to play pickleball well but now I can barely play and often with pauses to catch my breath. Even household chores like mowing the grass or vaccuuming are problems and require me to rest often. I'm 80 years old and no one cares it seems. When you're this age most doctors are only interested in their liability and not your life style. If I sound jaded and/or angry I probably am. I had a stage I heart block that morphed into a complete heart block. I thought I might be in heart failure with all this ventricle pacing but according to my EP I am not.