what is heart disease?

well! all i'm looking at is people talking about Cronary artry heart disease. heart diseases are of different types. i've done a little research on RHD Rehumatic heart Disease, in which the heart valves are damaged due to an infection caused by Streptocacus germs. my wife is a victom of it and has her Mitral valve seriously damaged and is regurging blood, creating several problems. it is in its fourth stage and the doctors say that some day we will need to take the risk of open heart surgery. i don't know about any body but i love her like crazy and i don't wana lose her. some time i ask my self why me and why her. but it is our fate we can't change it. pray for us.