I would recommend yearly or bi-yearly echocardiograms to "keep an eye on things". There is a small chance of the mitral regurg progressing and this should be monitored from time to time.
I believe you already posted this question elsewhere. I'm not sure I can say much based on what you have told me. It is possible he had a heart attack and didn't know it but there are other posssible explainations as well.
My Husband was also diagnosted with a leaky mitral valve Nov 98 .
The Dr said not to worry ,you can live with it , You probably had it as a cchild. Last week I urged him to get a follow -up echo and it showed 25% heart enlargement and recomend new valve. What could cause this and why so fast ? what if we didnot know this ? would he have had a heart attack. He has lost weigth this year and is exer. and really taking care of himself. What a shock. The Dr want to do surgery immed. Can you please give me an idea of what went wrong. Thank you Laverne