Hello, Thank you for your question. I will try my best to help you with your questions.
We grade heart failure as A, B C and D while we grade the shortness of breath associated with heart failure as NYHA grade1 to 4.
So in your case it is NYHA grade 3 which means that you have severe heart failure and outcome in such cases is poor.
So you need maximum treatment to reduce the risk.
I hope this answers your questions.