What's relevant is your health, symptoms etc, not the EF so much. Someone can feel awful with an EF of 30% while others can feel normal. If the Cardiologists felt you are high enough risk to require constant supervision, you would be hospitalised. The fact that your EF improved is a good sign.
I would agree with vienna13, an EF of 36% simply means your heart isn't working as efficient as it should be. What is the cause of your lowered EF?
When my EF was mid 20's I was still walking for exercise and doing low-impact weight excercises, but we all have different reasons for a lowered EF factor. It can, as you have already seen, change. Often the change is simply a different person reading the results differently. Also, with drug treatment, exercise, surgery and dietary changes, the EF can raise. In my case, I went from the 20's to the mid-40's. Those of us with heart problems are lucky compared to those with other organ problems, hearts can be repaired and re-built!
The Angiogram is a very good test to see if you have Cardiac Artery Disease. Keep us informed.
What kind of risk you mean? You won’t die from that EF . You don’t need hospitalization with that.