I am just over two years post OHS - ON-X aortic valve 19mm, ascending aortic aneurysm and innominate artery aneurysm repaired. I hear a clicking on very rare occasions if I am laying in the right position. I still hear a thump quite often if I am in a quiet environment. There are times when I also see my shirt move when it is really thumping. No rhyme or reason to when I feel the loud thumps. My cardiologist and other doctors remark at how loud my valve is. I'm used to it now. Luckily I don't notice it when I am trying to sleep.