I have some questions and concerns before making a decision on what type of valve to use to replace my stenosed aortic valve. It is down to 1.1sq cm. I've detailed the options for aortic valve replacement below.
Mechanical valves can last indefinitely if proper blood thinning medications are always taken.
Generally, a mechanical valve is most durable, a homograft next, and porcine valve last. Thus, you may want to reconsider a mechanical valve - taking coumadin to thin your blood isn't that bad. Endocarditis is a possibility with your stenosed native valve and any valve replacement. Thus, you need antibiotics before dental and other invasive procedures. Redo valve replacement is more difficult than the initial surgery, but can be accomplished with good outcomes in experienced hands.