Inclusion Criteria:  Patient requiring iterative exposure to ECT as part of their psychiatric pathology in one of the investigator center Patient who has not had ECT in the last 10 years for the phase E group, regardless of their previous ECT exposure for the phase P group Patient who has been informed and has signed the consent form  Exclusion Criteria:  Absence of written informed consent Allergies identified specifically to Neuro-Muscular Blocking Agents (NMBA) Patient under tutelage, curatorship or judicial protection Patient without social security Contraindication to ECT : intracranial hypertension, intracranial lesions without intracranial hypertension, recent episode of cerebral hemorrhage, recent myocardial infarction or embologenic disease, presence of aneurysms or vascular malformations at risk of hemorrhage, retinal detachment, pheochromocytoma, history of ineffective treatment with ECT having had serious side effects, taking anticoagulant treatments