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Your case sounds very interesting, and as a Cardiologist I can understand your concern. The truth is that when you have severe aortic valve stenosis, there is decreased blood flow to everywhere in the body, including muscles and nerve bundles -- at times and probably in your case as well - these low perfusion states present themselves as aches and pains , even in sciatica like fashion as the result of low blood delivery and low oxygen in the muscles affected (in this case pririformis).
So what does this mean for you? You probably still have spinal stenosis, but the symptoms were due to a low perfusion state due to your disease aortic valve - hence the improved symptoms since the TAVR.
Wish you best of luck ;)
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