Frankie - an echo stress test is just as good maybe better than a plain old echo. I had both. The numbers were worse on my echo stress test. However, three months later all my numbers (ejection fraction) were back to normal and the reason was that myocarditis can cause temporary (usually goes away) heart failure. My breathing got much better after that. The myocarditis cause is unknown though could have been pneumonia or the vaccine. No one knows. Now I can walk up a steep hill though my muscles have taken time to get back their strength after doing zero for so long.