It's a lot of simple things put together.
1- There is not as much time spent on teaching ACT management as it really warrants. It's an old drug, not pushed through the sales rep chain, nor lots of continuing ed in the general medical community on ACT (though specialty offerings are available. Much more strongly emphasized in the pharmacy CE than general medical). Mainstream medical journals have few articles on ACT. I never heard of the Journal of Thombosis and Thrombolysis until I was already on the rat poison (almost every issue has something new with regard to ACT pharacology and management). I personally had very little training in cases with patients on coumadin. Never had any CE in the stuff (never saw any offered), and thought I was in for a lifetime of no veggies and horrendous bruises. Glad I was wrong about that. I give talks at local medical meetings in managing ACT in extremity surgical cases - hopefully the info will gradually spread.
2- Older instructors and practitioners are more likely to be familiar and comfortable with the older protocols.
3- Proper teaching of ACT to patients take time. With reimbursements down and patient loads up, doctors have an average of 4 minutes per patient face-to-face time. Physician assistants and office nurses are generally offered and encouraged to take continuing ed in the things that will boost patient throughput for the majority of cases. There's lots of patients on ACT, but overall they're older and not good at self-advocacy skills (we valvers are a small minority of coumadin takers).
4- There's the liability issue. As backward as it sounds, the general public "knows" that "blood thinners" cause bleeding. If a patient is injured or dies due to a bleed while on coumadin the family (and jury) knows the doctor did something wrong and should have taken them off that horrible dangerous drug. They also know that the patient is on the medication to reduce the risk of stroke. Plaintiff's attorneys have no trouble finding "experts" to attest to this. If they do have a stroke; well, they knew it was going to happen sometime, it was just fate and not the doctors fault. We here know that just the opposite is more than likely true (yeah, stuff happens regardless of how perfect the care is) but most folks like their facts short and simple - coumadin makes you bleed too much.
5- I think that as time goes on there will be a warfarin replacement for post-op patients, those with AFib, and other such things, but probably not for valvers at first. Ideally with less needing ACT management, there will be more time spent to educate patients still on the stuff, but I fear that the emphasis will be less rather than more.
<end of rant>