Friday, July 18, 2008

Bioprosthetic Valves

-Bioprosthetic Valves are heart valves taken from either a human or an animal and used as a prosthetic.




-Theses Bioprosthetic valves are much more advantageous than artificial valves not only because they eliminate the need for long-term anti-coagulants, but they also don't cause any harm to blood cells.




- The human valves are separated into two categories homografts, which replace a human's valve with another human's valve, and autographs, which simply repositions a valve which is already in the patients body.




-Homografts have little to no problems with another human being able to accept the foreign valve, have good hemodynamics, which is simply defined as how much resistance to blood flow the valve gives, and durability.




-The most common procedure that uses autographs is called the Ross Procedure which replaces the valve in the aortic valve with the one in the pulmonic valve. The Ross Procedure is so effective that after 20 years only 15 percent of patients needed another surgery.


-This chart shows how successful the Homograft surgeries have been. The Blue Bar is the Percent Survival Rate, the Purple bar is percent of patients without Endocarditis, the yellow bar shows percent without pulminary tissue failure, and the green bar shows the percent of people who didn't need another surgery.


Websites

2 comments:

Shanice! said...

This was very interesting! I loved the graph because it put things in a visual aspect which is easier for me to fully comprehend.

John F said...

I agree with Shanice; the graph really aided in showing exactly how successful these devices are. I also have an easier time understanding things if if they are displayed visually.