Here in Belguim most people are prescribed Sintrom, not Warfarin, it is easier to control seemingly, according to my Heart Surgeon, I had a pulmonary embolism 2 years after my Op and we discovered that my body was producing too much vitamin K, I am stressed this week as have been very ill due to an allergic reaction and a very very difficult friend staying, she did a 3 month trip around Canada and USA then cam here on a tanker, too much time alone and in too many Hotels. Certainly the doctors told me to avoid vitamin K.