Study of the Occurrence of Cardiocirculatory Arrest as a Function of the Level of Hypoxemia During a Maastricht 3 Procedure

FOR THE DONORS : Inclusion Criteria : * Patient over 18 years of age * Organ donation procedure initiated in accordance with the legislation and procedures in force in France for the Maastricht III category * No opposition formulated by the relative to the patient's participation in the study Exclusion Criteria : * Patient registered on the national register of refusals or living refusal of donation * Pregnant or breast-feeding women * Patients under guardianship, curatorship or legal protection * Medical contraindication to organ donation according to the recommendations of the Agence de Biomédecine currently in force in France FOR THE RECEIVER Inclusion Criteria : * No opposition to the collection of data concerning him/her * Patient over 18 at pre-transplant consultation * Patient who has received an organ from a donor participating in the HEPHAISTOS protocol Exclusion Criteria : \- Patients under guardianship, curatorship or legal protection