Clinical Research Directory

Inclusion Criteria: * Patient over 18 years * Patient in operating room for scheduled surgery * Patient receiving general anaesthesia with orotracheal intubation * Patient given written consent after information * Patient covered by social security or equivalent regimen Exclusion Criteria: * Patient undergoing thoracic and spinal surgery, due to the presence of dressings that interfere with measurements, * Patient who has undergone intracerebral surgery because of possible communication difficulties upon awakening, * Patients with a body mass index (BMI) \> 50 (measurements not possible) * Pregnant or breastfeeding patient, * Patient contraindicated to the use of a thoracic electroimpedancemetry technique: dressings, wounds, presence of a pacemaker, defibrillator or any other active implant. * Patient deprived of liberty by a judicial or administrative decision or patient subject to a legal protection measure (guardianship, curatorship...) * Patient in a period of exclusion from another research protocol * Any other reason that, in the opinion of the investigator, could interfere with the evaluation of study objectives