hi i need to have my aorta valve replaced as its severely enlarged and the valves are not working properly and finding it very hard to decide whether a cow tissue or mechanical would be best both have problems i am 67 the mechanical you have to live with the ticking noise and also blood thinners and have also found out that very important to keep your oral health checked as if you were to get an infection it can cause a heart attack ,i already have receding gums so often i have to have a tooth pulled out or take antibiotic's for gum infections also there can be complications as to whether your body will accept the mechanical device then the cow tissue will only last approx. 10 maybe 15 years which would make me 83 years if I'm lucky to get to that age to have another operation my surgeon has suggested the tissue because of my age its very scary even thinking about the operation let alone trying to decide which one to have can someone please help me as i am will be admitted to a hospital soon thank you