He has an artificial heart valve, and the gold standard is coumadin.
I concur that a physician's input is essential, however the "standard of care" rule, prohibits a physician from bringing up alternatives unless the PATIENT initiates the question.
The patient has to say the magic words: "Doctor...I really don't want to be on Coumadin...what are the alternatives?"
Only THEN will the physician be free to consider alternatives.
Without knowing anything about the diagnosis or history of the OP's husband, I must point out that, in certain situations, Coumadin is the only medically acceptable anticoagulant. It depends on the reason for needing an anticoagulant, and it depends on whether the patient can tolerate aspirin or Plavix. Advice to consult one's physician is always appropriate, however.
He has to tell the physician he wants to get off coumadin and try another anticoagulant. Coumadin is the so-called "standard of care", and a physician will not suggest another treatment unless you initiate the request.
Plavix is an alternative that enables you to live with a more varied diet. The downside is that Plavix is not easily reversible, wheras Coumadin is.
Pub literature suggests that several aspirin tablets a day, may in some cases be sufficient to meet the necessary threshold of anticoagulation instead of Coumadin. Do a pubmed search and talk to your doctor.
He just needs to eat a diet that is reasonably consistent in its levels of vitamin K. If he is getting his INR checked at least once a month, and the INR is relatively stable, then his diet is appropriate, as far as his taking Coumadin is concerned. The INR will show it, if there is a problem with his diet. He has been on Coumadin since 2002, so if there have been no major problems with his INR so far, then I wouldn't worry about it.