Study halted prematurely and will not resume; participants are no longer being examined or receiving intervention The study was terminated prematurely due to inclusion difficulties

Prospective, open-label, single-center, study to investigate the effect of sevoflurane sedation compared to a propofol-controlled arm during COPD exacerbation requiring invasive mechanical ventilation in ICU.

Primary outcome measure:

Evolution of airway resistance before and after sevoflurane in COPD patients,

Secondary outcomes measures:

Respiratory mechanics (Maximum pressure, PEEPi and PEEPtot, trapped volume), Gas exchange by the help of blood gases, The heterogeneity of alveolar ventilation by electro-impedancemetry, Evolution of pulmonary inflammation, Trophicity and contractility of the diaphragm,

Inclusion Criteria :

• COPD exacerbation
• Invasive mechanical ventilation and sedation for a planned duration of at least 24 hours
• Consent
• Age ≥ 18 years
• Affiliation or beneficiary of a social security scheme

Exclusion Criteria :

• Contraindication to the administration of sevoflurane (personal or family history of malignant hyperthermia, allergy or halogenated anesthetic accident, chronic myopathy, halogenated toxic hepatitis, uncontrolled intracranial hypertension, unexplained leukocytosis after anesthesia with a halogenated agent)
• Contraindication to the administration of propofol (known hypersensitivity to propofol, soy, peanut or any of the excipients of the emulsion, antecedent of Propofol Related Infusion Syndrome)
• Refusal of consent
• Guardianship
• Age < 18 years
• Pregnant or lactating woman