Inclusion criteria:  Major subjects ≥18 years old Cardiac surgery or ascending aorta Platelet transfusion for any reason Subject not having expressed their opposition, after information, to the reuse of their data for the purposes of this research  Exclusion criteria  Subject having expressed opposition to participating in the study Presence or - installation of transient circulatory assistance (outside of the CEC) or definitive Heart or cardiopulmonary transplantation Subject under guardianship or guardianship Subject under safeguard of justice