1.   Currently the U.S. leader in the mechanical valve market, the company is positioning itself for similar success in the tissue valve category.

2.   Currently, the company is the U.S. leader in mechanical valves.

3.   Patients with mechanical valves have to take blood-thinning drugs to prevent blood clots.

4.   Shepherd said St. Jude expects to see similar success with a tissue valve as it has in mechanical valves.

5.   They said patients who have mechanical valves installed must take blood thinners for the rest of their lives or risk having a stroke.

6.   Young was intrigued because the human valves were harder for surgeons to put in and more expensive than mechanical valves.

7.   The official said that footage of a kidney transplant operation was in fact an operation to replace a mitral mechanical valve that Wu and Roberts were invited to observe.

8.   The patient was in fact having a mechanical valve replaced, he added.