Wow, that is a tough question. I was 37 when I had my Mitral valve replaced so I know how it feels to choose, but your choice is a difficult one. That was in 2003. I can understand your concern at his young age for not wanting him to be on Coumadin for the rest of his life like I am. On Coumadin, he will also have to go the doctor every single month for the rest of his life. Also, they will not know if they can actually repair the valve until they are in operation. So I understand you have to make the choice beforehand. If they cannot repair his valve and you choose a tissue valve, there is no doubt he will have to have another valve replacement in his lifetime, at his young age several of them. Tissue valves last tpically 10-15 years. Tissue valves can also tear and become infected.
I chose a mechanical valve. I have a St Jude Mechanical Valve, very durable, the more durable the longer they are suppose to last. I was told by my surgeon they could last up to 50 years (I hope it lasts for the rest of my life, because I really don't want to go through that again), so I picked the longest lasting one.
But being on Coumadin at his young age and because he will probably want to play sports, etc., wow, it is a tough decision and because he is so young, even if you chose the mechanical valve he will probably have to have that replaced in years to come also because he is so young. But with a tissue valve and his young age, he could be having this same surgery every 10-15 years instead of 40-50 years or longer. If it were my child I would prefer to get a mechanical valve because of not wanting him to have so many surgeries. Valve replacements are tough surgeries. I wish I could give you a yes or no answer, but it is only a choice you can make. I would rather see my son not play sports than to have to go through such a tough surgery every 10-15 years if a tissue valve is picked.
In spite of chemical treatments to improve durability, tissue valves typically last about 10 to 15 years. They usually fail because of the same calcification process that affected the original valve.
In general, mechanical valves are the preferred choice for children, teens, and adults age 60 and younger, all of whom will likely outlive a tissue valve and need another valve replacement.
Tissue valves are most appropriate for people who are less likely to outlive their valves, which includes people who:
Are older than 65.
Are younger than 60 and have lung disease.
Have heart failure.
Have coronary artery disease.
Have kidney disease.
Have a life expectancy of less than 10 years.
Click on this link I provided so you can read the entire article for further information.
http://www.webmd.com/heart-disease/Should-I-replace-my-aortic-valve-with-a-mechanical-or-tissue-valve
Good luck to you and your son and I am very sorry you are having to go through this difficult decision.