Mitral valve disease is either degenerative, due to infection, or rheumatic in origin. Rheumatic disease is now rare in the UK and the majority of patients undergoing mitral valve surgery have valve regurgitation due to prolapse of the valve. This can often be repaired without the need to replace the whole valve. This avoids the need for warfarin therapy.
If the valve is not repairable then either tissue or mechanical valves offer an excellent durable option to correct the valve pathology.
The risk of mitral valve surgery varies from 1-5% depending on the complexity of the problem and the presence of other health issues.