I have been going to Colorado and New Mexico every few years since I was a child. It was only on 2 of those dozens of trips that the altitude affected my heart. I might be a little out of breath or feel like my feet were heavy at 10,000 feet but never had my heart act like it did on those 2 trips. The most recent was about 5 years ago and then on a trip 10 years before that. This last time I should have gone to the ER, I’ll bet they would have given me a portable oxygen tank.
Yeah... you’d better stick to low-altitude states. =8-0