Prospective Study of Antiplatelet and Anticoagulation Therapy in Hereditary Haemorrhagic Telangiectasia

The goal of this clinical trial is to evaluate in real life, in patients with Hereditary Hemorrhagic Telangiectasia (HHT), the tolerance of the strategy of use of anticoagulant and/or antiplatelet, by comparing a new exposure period (first trimester of treatment) to a period of reference non-exposure (last trimester before start of treatment).

Inclusion Criteria: * Patient with Rendu-Osler disease with an indication of antiplatelet and/or anticoagulant introduced for less than 3 months (inclusion period within 3 months of exposure) * Age \> 18 years old * Patient able to understand and agree to participate in the study * Affiliation to a social security system Exclusion Criteria: * Patient with an indication of antiplatelet and/or anticoagulant but for whom treatment has not been introduced or introduced for more than 3 months * Refusal to participate * Pregnant woman or who are breast feeding * Patients under maintenance of justice, wardship or legal guardianship