My mom just found out she will need to have the Bentall Procedure for bicuspid aortic valve and aortic aneurysm (5.1cm). I live near Duke University, we are considering this or Dr Raissi at Cedars-Sinai in Los Angeles. My biggest concern at this point is circulatory arrest involved in this procedure. I am a registered nurse and I understand the medical mechanics involved and it is still scary to me. Any advice?