My experience with a bicuspid aortic valve was that I could lift moderate weights (10-12 reps per set) and be fine. I had the Ross procedure at age 20 and continued to lift moderately for almost two decades. When I turned 39 I had a bit of a mid life crisis I guess and started powerlifting. After 6 months I gained 15 pounds of muscle and was hitting new highs on lifts weekly. (To get an idea of what I was doing- I weighed 178 and was bench pressing 275+, leg pressing 450+. STUPID!) Then I went in for my yearly echo and the status went from pretty good a year earlier to "severe aortic insufficiency and severe pulmonary stenosis". No more lifting at all after that. I accredit the rapid progression almost exclusively to the heavy lifting. I had both valves replaced again recently and will only be lifting lighter weights from here on out. Enough to get my heart rate up some and stay in shape. What I was doing was just midless and crazy, but I would think that weights that aren't as heavy (but still on the heavy side) would have similar repercussions.