International Normalised Ratio Evaluation by Generalist Practitioners in Full-time Care Establishments for the Elderly

Inclusion Criteria: * The patient resides at the establishment for the dependent elderly (nursing home (EHPAD)) in Pont-Saint-Esprit, France * The patient must be insured or beneficiary of a health insurance plan * The patient treated with vitamin K antagonist for over six months * The patient must have given his/her informed and signed consent * For adults under guardianship, the legal guardian must have given free and informed consent and signed the consent Exclusion Criteria: * The patient is under judicial protection * The general practitioner in charge of the patient at the EHPAD does not want to participate in the study * It is impossible to correctly inform the patient, or his/her legal guardian * The patient, or his/her legal guardian, refuses to sign the consent * The patient is participating in another interventional study, or has participated in another interventional study within the past three months * The patient is in an exclusion period determined by a previous study