I got dxd with mvp almost 20 years ago. I never took any meds for it. A few years ago my doctor decided to do another ecg and decided that I don't have mvp now. He said the mitral valve is thick but not prolapsed. I don't really understand why the same test years apart is showing different results. It makes me wonder how reliable these tests are. I still get some weird, irregular beats sometimes but thankfully there isn't usually pain. I think it's a good thing they are doing those tests for your son. Is this the first time he has been medicated for it?