To better answer your question(s), it would help for us to know more about your / his? (husband, son, father? age?) situation such as
What tests have been performed ? (has he had an echocardiogram? Heart Catheterization?)
Do you have copies of the Test Report(s)?
If not, it would be wise to go to the facility where the tests were perfromed and requset copies.
You may have to pay a copying charge.
(Only get the pages you actually need...they should allow you to preview them first)
What Valve(s) are in need of replacement?
A common guideline for Aortic Valve Replacement is an effective area of 0.8 sq cm or less.
There are other criteria such as insufficiency (a.k.a. regurgitation) where blood is forced back into one of the heart chambers (depending on which valve is 'weak') during it's pumping phase.
Since 'the patient' has a history of BiCuspid Aortic Valve, you may want to also browse through the Bicuspid Aortic Valve and Connective Tissue Disorder Forum for LOTS of background on those often related conditions.
'AL Capshaw'