tell me about the various breathlessness grading scales like ATS,MRC,MMRC and so on.?

Question

breathlessness is aclinical condition in which patient feels difficulty in breathing due to various underlying diseases of cardiac and pulmonary origin.

Answer 1

what exactly are these names. I can tell about NYHA classification of heart failure that causes shortness of breath and this has now been changed to grade a-d. otherwise shortness of breath is simply shortness of breath, good luck