Heart monitor could make blood thinners safer for heart attack patients

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Atrial fibrillation diagnosed before hospitalization for acute coronary syndrome, whether treated or not. * Atrial fibrillation still present at inclusion time. * Transient atrial fibrillation due to a reversible disorder (thyrotoxycosis, pulmonary embolism, recent surgery). * Acute coronary syndrome that has not been revascularized. * Acute coronary syndrome surgically treated (bypass). * Patient already on anticoagulant therapy. * Scheduled aortocoronary bypass. * Creatinine clearance \< 30 ml per minute. Exclusion Criteria: Pathologic criteria : * Atrial fibrillation diagnosed before hospitalization for acute coronary syndrome, whether treated or not. * Atrial fibrillation still present at inclusion time. * Transient atrial fibrillation due to a reversible disorder (thyrotoxycosis, pulmonary embolism, recent surgery). * Acute coronary syndrome that has not been revascularized. * Acute coronary syndrome surgically treated (bypass). * Patient already on anticoagulant therapy. * Scheduled aortocoronary bypass. * Creatinine clearance \< 30 ml per minute. Bleeding risks : * Contraindications to anticoagulant therapy. * Active internal hemorrhage, clinically significant bleeding, bleeding non accessible to compression or bleeding diathesis within 30 days prior to selection visit. * Platelet count \< 90000/µL at the selection visit. * Bleeding event in the twelve months prior to inclusion. * Bleeding events detected either clinically or biologically (hemoglobinemia \< 10g/dl). * Elective surgery. Comorbidities : * Cardiogenic shock. * Hyperthyroidism. * Prior history of significant liver disease (acute hepatitis, active chronic hepatitis, cirrhosis) or liver function disorder detected at selection visit. * Significant mitral valvular heart disease. General : * Patient under 18. * Non menopausal woman or without contraception. * Patient whose physical and / or mental health may have an impact on the compliance to the study. * Participation in another biomedical research study (interventional or noninterventional) or participation in a research study within the 30 days prior to inclusion. * Protected adults (under judicial protection, guardianship, or supervision).