Inclusion Criteria:  Patient on anti-coagulating therapy before or during hospitalization for atrial fibrillation Patient hospitalized in the cardiology ward admitted for acute or chronic coronary syndrome requiring coronary angioplasty The patient must have given their free and informed consent and signed the consent form The patient must be a member or beneficiary of a health insurance plan  Exclusion Criteria:  The subject is in a period of exclusion determined by a previous study The patient has already been included into this study It is impossible to give the subject informed information The patient is under safeguard of justice or state guardianship Patient pregnant, parturient or breast feeding