When I was diagnosed, a good 20 + years ago, I was told that altitude was going to be an issue for my hiking. I told the hematologist that as a West Virginian, my highest hikes were only at 4800 feet. He responded that given my home is at only 250 feet that I should " work up" to that elevation by hiking at lower, but gradually increasing, heights. Which I did and had no problem with 5000+ feet hikes.
Then Covid came and my hiking adventures had been severely limited for the past 3 years. But I still walk between 5 and 7 miles a day in my neighborhood. I completely forgot that diagnosing doc's warning about APS and elevation. I was so glad when case numbers dropped and I can finally get back to hiking my favorite trails. Last month I was finally back in beautiful Holly River Park on a strenuous hike at @1500 feet when I suddenly felt " woozy." Not dizzy, not weak but woozy. A hiking friend told me I was pale as a ghost. I rested, and continued with no more issues, though I paused to rest intermittently. I attributed my wooziness to the difficulty of the hike. My Apple watch detected no A fib. Wooziness lasted less than 20 minutes or so.
The next week I was a passenger IN A CAR when that wooziness returned. Wooziness only lasted less than 10 minutes. My driver and I agreed to modify our hiking goal from the 7 mile hike down to a couple of 1milers, through which I felt fine.
The only common denominator was height. Thats when I remembered that long forgotten warning from my diagnosing physician. I am currently wearing a heart monitor and I will consult with a cardiologist tomorrow. Anybody else have heard or experienced issues with mild to moderate activity at higher-than-usual elevation?