Heart Point http://www.heartpoint.com/valvularheartdx.html
A lot to be found here, including regurgitation, causes of valvular disease, therapy and surgeries available. An excellent diagram of regurgitant mitral valve in motion is shown.
One Valve For Life http://www.onevalveforlife.com
Details on mechanical heart valves and tissue valves. Highlights patient stories and features information on valve durability, hemodynamic performance, operative risk and life expectancy.