This is a prospective study to evaluate the predictive value of the TEG 6s platelet mapping® (TEG 6s® PM) performed during cardiopulmonary bypass (CPB) in the prediction of biological coagulopathy (determined by TEG 6S global hemostasis®), in cardiac surgery with high risk of bleeding.

The aim of this prospective study is to evaluate the predictive value of the R time (HKH) given by the TEG 6s platelet mapping® performed during the CPB in the prediction of postoperative biological coagulopathy.

In order to evaluate its interest and to validate its use during cardiac surgery with high bleeding risk under CPB, we plan to compare 2 thromboelastographic tests in the detection of biological coagulopathy: TEG 6S citrated® (reference) and TEG 6S platelet mapping®. Biological coagulopathy is defined by a kaolin-heparinase assay coagulation/reaction time (CKH R) value of 7 min on TEG 6S citrated® (fibrinogen impairment defined by a Comparison of functional fibrinogen Maximal Amplitude (CFF MA) < 20 mm, and CKH MA impairment (< 60 mm), in accordance with established laboratory standard values.

Inclusion Criteria:

• 18 years old or older
• Cardiac surgery under cardiopulmonary bypass with high risk of bleeding defined among:
• CPB with circulatory arrest
• cardiac transplantation
• Redo surgery
• infective endocarditis
• predicted duration of CBP ≥ 120 min
• High transfusion risk defined by a Trust predictive score ≥ 3 (Transfusion Risk Understanding Scoring Tool)

Exclusion Criteria:

• Patient with heparin allergy or heparin-induced thrombocytopenia
• Use of direct oral anticoagulant (DAA) with anti-factor X activity (Apixaban, Rivaroxaban) < 72h, even if antagonized
• Patient on partially or fully antagonized VKAs
• Opposition to participation after a period of reflection
• Adult protected by law (guardianship, curatorship)
• Person deprived of liberty
• Person participating in another study with an exclusion period still in progress
• Patient not affiliated to a social security scheme or not benefiting from such a scheme
• Pregnant or breast-feeding woman

Any subject undergoing cardiac surgery with cardiopulmonary bypass circulation and at high risk of bleeding and transfusion.