I’d wait to get your second opinion before getting too much more bent out of shape. Dr Google can cause lots of anxiety. Assuming your first cardiologist is decent he would have understood all the testing and gave you a fair recommendation.

The wording you are listing appears to be a fair bit of scary sounding medical speak. Hopefully one of the cards will give us their thoughts but 25-49% sounds like medical management.

Did you know when they did autopsies of 18 yo IS soldiers in Vietnam they found evidence of atherosclerosis. I learned that factoid in med school (or was it residency) and it always stuck with me. You don’t have to have 3 big Macs per day to have blockage. The western diet does this to our arteries.