Your choice should be one that reflects your lifestyle choices and which you can live with over time. If you get a tissue valve now (as I requested and received at 52), you will have at least one more surgery over time, probably shortly before you're 70. That may not be your cup of tea. You need to determine how your personal drivers work with each of the types. Either will work fine for you, and neither would force you to make a decision about which type of bike you use, or how hard you want to work out, once you're recovered.
Regarding the Coumadin percentage, it's a non-issue:
On-X Marketing Site said:
Age > 70: People over 70 years of age have more complications related to use of anticoagulation.(15) Therefore, surgeons most often recommend valves that do not require the permanent use of anticoagulant medication (tissue prostheses). However, many people of that age are already taking anticoagulant medication for other reasons such as heart arrhythmias, or irregular beats.15,47 As many as 50% of patients who have opted for tissue valves to avoid anticoagulation require this medication for other non-valve related reasons.(47)
Here is the convoluted statement that the marketing people put into the On-X site. It is attempting to say that it doesn't matter if older people (over 70) have more complications on anticoagulants by saying that more of these people have had reasons to use "anticoagulant medication" anyway (for strokes or heart attacks).
"Anticoagulant medication" includes anyone taking Coumadin, Plavix, heparin, or aspirin. Note that most people over 55 now take an 81mg aspirin each day for that purpose. In fact, neither Coumadin nor warfarin is actually mentioned in the text quoted above at all.
The last line is the one that is supposed to get its information from
Philips SJ. Searching for the truth: a mechanical or a tissue valve? J Heart Valve Dis 2004;13(Suppl.1):S95-S98 This statement is not a quote from the article, but claims to use it as a source. The line plainly
also refers to generalized "anticoagulant medication," which would include clopidegrel (Plavix) or aspirin, and doesn't specify coumadin or warfarin.
This was a marketing statement. It didn't lie, but it is misleading. It's eay to see how Coumadin winds up being the anticoagulant in everyone's mind when they read this.
I should note that Dr. Philips' article was printed in a trade magazine used primarily for marketing purposes for the valve replacement community. The only references to this article I can Google are from MCRI (On-X) sites and one site in China, where two young doctors refer to it in an unrelated article they published about a study involving 52 aged patients (36 with AFib) with poor heart function, whose heart function was restored after valve replacement.
I would also point out that the same MCRI site indicates that porcine valves decline in eight years and bovine in ten. Accurate - if you use studies from valves made thirty years ago or use data highlighting young age groups.
This is advertising. By its nature, it's biased. I believe personally that the On-X is the most advanced mechanical valve on the market today, but I am enormously disappointed in the lack of quality and honesty in their advertising copy. Their product is more than good enough to compete without this type of misdirection.
Best wishes,