My sixteen year old granddaughter was born with Down Syndrome and Tetrology of Fallot (holes in all 4 heart chambers).  She has had 3 open heart surgeries, and now she has a 52% blockage and a large leak.  Doctors say that treatment could cause aortic failure, but no treatment could also cause it.  What is the prognosis?
Your granddaughter has very complicated heart problems. You are asking very specific questions that can only be answered with specific knowledge of her and her prior surgeries. Discuss these questions with your doctor.