Hi, @bforbes - welcome to Mayo Clinic Connect, and apologies on my tardiness in doing so. Sounds wise that you are looking into any potential risks for your mom prior to the aortic valve replacement.

A few members who have talked about CAA and who may have some input on potential increased risk of another cerebral hemorrhage with having large doses of blood thinners during surgery include @shedwina @coloradogirl @bortner @thomaslmason @gbiffart @sistertwo. @hopeful33250 also may have some thoughts for you.

Is the surgeon willing to take on her surgery at this point, with some risk mitigation, or is she or he not recommending going forward with the surgery? Have you looked into the option of getting a second opinion?