Last year they remarked that nothing has changed since I had bypass surgery 27 years ago. Every time they do a test I hear "35% ejection factor" mentioned which I think has something to do with that aortic valve. They all find it remarkable that I'm still the same as when I got out of the bypass surgery. 6x bypass
When I went to the surgeon 27 years ago who fixed my plumbing, to have the staples removed from my arm where they harvested an artery to get the replacement plumbing, I asked him what I could/couldn't do now? His reply "As far as I'm concerned you're as good as new and you can do anything you want". (He died earlier this year) So when they keep telling me I'm the same as I was after the surgery, that makes me pretty happy. I also have to wonder if he has read my records/history.
When I first met the cardiologist (about 2016) that was the first time I've been to one since the surgery in 1996. I liked him right away. When he entered the office where I was waiting his attention getter was: "You should be dead. Most people who had what you had, come back for more in 10 years and they don't make it to 20."
So I don't know why he's talking the same tests again but the stress test is fun. I get to meet an old friend who was one of the drill sergeants at cardiac rehab almost 30 years ago. She even holds my hand when they shoot me the juice that's supposed to make me feel like I can't breathe --- it doesn't.
i read echo cardiogram reports on a daily basis as a critical care nurse. The "35%" they are referring to is your ejection fraction (not "factor" :-)) It refers to the percentage of blood ejected from (in this case) one of the chambers in your heart (there are 4, 2 atrium, 2 ventricles). Typically the number refers to the left ventricle ejection fraction (LVEF) since that's the part of the heart that supplies the whole body. "Normal" EF is 52-72%, 30-40% is "moderately abnormal," so your EF is "moderately abnormal" at 35%. https://my.clevelandclinic.org/health/articles/16950-ejection-fraction
The heart is complex. i'm not a cardiologist, that's about 15 years of education just to qualify, then you want someone with several years of experience on top of that education. i've been working with lots of heart patients for 10 years in a critical care setting and i learn new things all the time, there are new innovations, treatments. i get to see a lot being in a teaching hospital. That to say, this is not easy stuff to grasp, and i'm just skimming the surface, no doctor can give us complete understanding or the benefit of their education and experience in a 15 minute conversation. Trust is a big factor. That said:
6x bypass is extensive, so you are indeed doing well for that to have sustained 27 years. Bypass is about fixing the blood supply going to your heart, EF is about the blood your heart muscle pumps to the rest of your body. Two different things. An echo can show a lot about the heart muscle, things like the four heart valves, the muscle it self, but not the blood supply going to the heart. The most definitive test for blood supply to the heart is a heart catheterization.
It sounds like your doctor may be talking about fixing/replacing your aortic valve, that's a pretty common heart valve replacement due to stenosis and regurgitation. An echo will give a visual of that valve and show things like stenosis and regurgitation. The stress test shows pretty much what the name implies, how your heart and body respond to stress. They may put you on a treadmill or give you adenosine to stimulate your heart, then take pictures with dye. There's different levels of tests that can give info about the heart. EKG/ECG is basic electrical, but it can tell us stuff about infarction, ischemia, dysrhythmia to name a few. Blood tests can tell us things like fluid overload with a BNP (common in heart failure) a test like troponin for myocardial infarction (heart attack), those are more during the event tests. Stress test is the next level up, echo, then heart cath is the most definitive. i'm way over simplifying and leaving a lot out.
If your aortic valve is not functioning well enough, they may med manage you or suggest replacement. Aortic valve replacement can involve open heart surgery similar to what you went through with bypass surgery, where the sternum is split and chest opened, etc.. Another method would be a TAVR (transcatheter aortic valve replacement). The second method is MUCH less intrusive and typically involves accessing vasculature from the groin, very similar to a heart catheterization, it's a wonderfully elegant, and comparatively simple procedure i my opinion.