Measuring bedside occlusion pressure in neurosurgical or surgical critically ill patients could tell us about the patient's respiratory drive, and therefore, tell us whether or not extubation will be successful.

Inclusion Criteria:

• Age ≥ 18 years old,
• Hospitalized in surgical or neurosurgical intensive care units
• Patients under mechanical ventilation for more than 48 hours,
• Meeting the criteria for severability (spontaneous ventilation test),
• Free subject, without tutorship or curatorship or subordination,
• Patients benefiting from a Social Security scheme or benefiting through the intermediary of a third party,
• No objection given by the patient and / or relative after clear and fair information about the study.

Exclusion Criteria:

• Tracheostomized patients,
• Persons benefiting from enhanced protection, namely minors, persons deprived of their liberty by a judicial or administrative decision, persons staying in a health or social establishment, adults under legal protection,
• Pregnant and / or lactating women.

Patients hospitalized in surgical or neurosurgical intensive care units of CHU de Poitiers, under mechanical ventilation for more than 48 hours, meeting the criteria for severability.