Local doctors couldn't find out why I was out of breath. Nothing was showing up in tests. Conclusions included I was out of shape (maybe somewhat), too heavy (not that much) and getting old (had to agree). Got into cardiology at Mayo. The cardiologist I saw was wonderful but he, too, couldn't figure it out. He even said, "Well, I can't shoot you or hang you. I have no evidence." He then said there is one last test we can do, if you're up for it. It was a stress test with catheters in and around the heart, with anesthesia, and was done in St. Mary's Hospital. There were five doctors (two were students) and five nurses present. They found I have heart failure with preserved ejection fraction, HFpEF. Nothing to do directly with my weight, fitness or age. I've been treated at Mayo for many illnesses, even stage 4 cancer. I can truly say Mayo has kept me alive. In my experience, Mayo isn't perfect but is as close as human intelligence can come to medical perfection. I thank God every day for Mayo Clinic.