I’m not sure what syndromes you are asking about, but my aortic valve is checked every year through an Echocardiogram, that’s how they found it was bicuspid about 12 years ago, now that I had my aneurysm repaired it gets monitored to check how much it deteriorates every year, at some point hopefully several years from now it will have to be replaced, but now it can be done endovascularly since the aneurysm is no longer there