Epidemiologic data indicate that warfarin could increase the calcifications of cardiac valves and coronary arteries. However, these studies were not interested in abdominal aorta's calcifications which are considered like an important marker of cardiovascular risk and did not concern the fluindione which is the most used VKA in France. Even if a class effect seems logical, the investigators can't dismiss the local effects, different to warfarin. In these studies, the calcifications assessment were rarely quantitative and the MGP levels were not measured. The vascular calcifications constitute a potential adverse effect of VKA which could limit their benefit in certain populations.