Mickey, I don't want to scare you. What happened to me is very rare. My body created pannus (scar tissue) under and on the mechanical valve and closed it off. I have connective tissue disorder which may have contributed to this happening. I was under the impression that once my valve was replaced the first time I was home free. However, my experience brings home the importance of keeping your follow up appointments for the rest of your life. The fact is we are more likely to have other heart problems too. I am 48 years old an have had 2 OHS. There is another in my future even if the scar tissue doesn't grow back because the tissue valve will not last the rest of my life unless I get hit by a bus!! HA ha! For the majority of you all one surgery is all you'll ever need. I hope this is the case for you Mickey. your Doctor has an excellend reputation and I know he'll do a great job for you. Take care.