21. Another option for aortic valve replacement is transcatheter aortic valve replacement ( TAVR ). 22. Another option for aortic valve replacement is transcatheter aortic valve replacement ( TAVR ). 23. This principle applies to tricuspid valves as well as bicuspid or unicuspid aortic valves . 24. Beginning in 1971, it has been used to replace aortic valves and mitral valves. 25. Just as older people's arteries harden, something sometimes scars the aortic valve 's tender leaflets. 26. In some cases, a human aortic valve can be implanted. 27. The aorta is divided above the aortic valve and root. 28. Heart tissue receives blood from two arteries which arise just above the aortic valve . 29. Fifteen of the 18 had leaky aortic valves , and three had leaky mitral valves. 30. The aortic valve , which has three cusps, lies between the left ventricle and the aorta.
