Here is my understanding of riding with a heart condition of any sort: At age 40 you should have an EKG test (everyone should). Anyone with a serious heart condition and is riding should have a stress test. They push you to your physical limit, but the cardiologist is right there with the paddles at the ready. The other must have test is a Holter. It is a 48 hour EKG recording of your hearts every beat during your normal day and night activities. It showed my heart rate at well over 200 while riding up hill. I had my meds altered twice and told to take it easy on the hills. I am running a 24/34 for my low gear now, and anyone and everyone passes me on the up hills and thats just fine with me.
If you are on blood thinners, I am, 60 mph is too fast. That is 100 kph. The first thing I was told when I was put on Coumadin was no skiing and no rock climbing, period. Blunt trauma is more serious than even a severe laceration. A bike crash at 100 kph could lead to some serious blunt trauma. I limit myself to 40 kph unless the conditions are perfect, then I might push it to 50 kph (± 30 mph). Lots of riders also pass me on down hills, and that is fine too. A lot of riders just pass me period. My days of century and double century rides are ancient history now, but I'll be touring the Oregon coast next month.
My cardiologist said that the riding and my other physical activities were doing more good than the meds he is prescribing. His words were, dont stop being active.
Sixty and still active,
Western Flyer
Western Flyer