Hi Kcstock,
We also watched my husband's mechanical valve because of increased pressure gradient - no other problems with his heart, no obvious symptoms, etc.
Pannus is scar tissue that forms around the valve opening, and we understood that because of this in his case, the mechanical valve would need to come out at some point.
However, he had just had aneurysm surgery in 2001, and there were no indicators of anything that would force surgery immediately. It seemed safe to give it a little time, watching carefully.
In spite of careful monitoring, one day in the fall of 2005 he suffered a massive right brain injury. I returned home to find him on the floor, completely helpless.
No one knows when they appeared on the scene, but fine hairlike strands of tissue had formed on the intake side of the valve and were floating in the blood stream. Some of them broke off and went to his brain. It could have taken his life, or disabled him even more than it has.
I do not want this to happen to anyone else.
Here is a paper that was published after this happened to him. It covers all the known problems that can happen with prosthetic valves - including pannus and strands, which he had.
http://bicuspidfoundation.com/Evaluation_of_Prosthetic_Heart_Valves_Van_den_Brink.pdf
I encourage you to share this with your physicians. If they are not open to this information, if this were my body or my husband's, we would keep looking until we found someone who was - someone who would leave no stone unturned in understanding what is happening.
We cannot go back to those days in 2005 and proactively take out that valve in time to avoid what happened. Sharing this, I hope it will help you and anyone else who reads it. Since my husband, I know of four others who had their prosthetic valves removed because of strands. Three of them had strokes before it was realized there was a problem.
I don't want to frighten you - I just hope it will help you be checked thoroughly.
Best wishes,
Arlyss