Hi Bigcchzz and welcome to the forum.
I really thought I would get more years out of the tissue valve.
I wish I had a dollar for every time I hear that. Before making my valve choice I read thousands of posts on this forum, and even went back 10-15 years reading old threads. So many times members have said: "my surgeon told me that I could expect 15+ years out of the new tissue valves, but it olnly lasted___."
Well, the evidence was not there for their physicians to tell young patients to expect 15+ years tissue valve life expectancy in 2005-2015 and it still is not there for them to make this claim today. Tissue valve manufacturers are very good at influencing many clinicians to go outside the guidelins with the "hope" that their new valves will last much longer than the data predicts. But, I do see that your cardiologist and surgeon both recommended mechanical given your age and you went your own way. Ultimately, it is truly the patient's choice, as it should be. You got 8 years out of your tissue valve- seems 8-12 years is very common for folks under 60.
You chose tissue for the reason that I almost did and that most do- fear of Coumadin. I put great value in the experiences shared by members like
@dick0236 who have used Coumadin for decades and shared that it is no big deal. My 8 months on Coumadin have been easy- weekly self testing of INR is a breeze.
As to your question. Yes, TAVR is possible for someone who has a tissue prosthetic. It depends on at least two factors
1) If you have the right type of tissue valve. Some are capable of accepting a TAVR, but there are a few that will not work with TAVR. Last year I met with the interventional cardiologist at Scripps who does most of their TAVRS, for TAVR evaluation and to discuss also the possibility of going tissue and then TAVR. He cautioned me if I do decide to go tissue and then plan to do TAVR for the next round, then I should avoid two certain tissue valves, which are not compatible with TAVR. I have them in my notes somewhere. Ended up being a moot point, as I went mechanical. BTW, after reviewing my echo, he concluded that I was not a TAVR candidate for surgery #1 due to uneven aortic calcification in my native valve- see #2 below.
2) Even if you have the right tissue prosthesis, there are other factos, such as distribution of calcification, which will determine if you are a TAVR candidate.
If you are considering TAVR, you will evaluated whether it is even an option, depending on the type of tissue valve you have. They will then probably need to do a CT scan to determine if you are a good candidate for TAVR based on what is going on with your current prosthetic valve.
Best of luck with whaterver you decide and please keep us posted.