Lots of love and hugs for JOR xxx - dont worry too mcuh Hun (easier said than done I know) my little Persian girl Bina had a heart murmer all her life and it never affected her quality of life, in fact you would never know there was anything wrong - she eventually went to the Bridge because of PKD.
Im sure I read somewhere of a kitten that was diagnised with a heart murmer and after about 2/3 years it dissapeared?