What Does This Stress Test Result And Severe Mitral Valve Replacement Indicate?

I m a 71 year old male with moderate to severe MVR. I had a stress echo today and had gotten to stage 5 when tech stopped test since he had way more info than necessary. I had no problems and tech agreed I could go farther but there was no need to do anymore than the 13 minutes I had already done. Question: Are my results satisfactory given my age etc.? Also, what if anything can a doctor infer regarding coronary artery disease, ned for surgery etc.?Thanks.