interesting (and sad).
Would you mind letting me know how they fitted in with the risk criteria I posted above? Knowing so many valvers personally (and not via here) is rather uncommon so its good to get some information if you're willing to share it.
Also were attempts made to address the Pannus growth prior?
On-X adds what it calls a Pannus Guard to its unit. I'll be interested to see how effective it is. Pannus is a problem for all valves AFAIK. Still if the people got 30 years on the valve that's good. In my case I was "opened up" to fix an aneurysm and my homograft valve (still functional) was removed and replaced at that time. I was 28 on the placement of the homograft and 40 on the placement of the mechanical and aneurysm fix.
Also, on this forum if you look for it you can find member stories where redo OHS was done because of pannus and even obstruction caused by blood-clot build up (hence the need for anticoagulation to be consistent. The primary focus of many is stroke, but indeed thrombosis is a problem
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1861363/
this is now more commonly treated with tPA administration as mentioned in that article
Best Wishes