This observational study aims to describe the number of rehabilitation procedures performed per patient during their stay in French-speaking adult intensive care units undergoing invasive mechanical ventilation (average rehabilitation ratio). The study aims to determine the actual rehabilitation ratio, i.e. the number of rehabilitation procedures divided by the number of critical care hospital days (censored at day 28 from the start of invasive mechanical ventilation), provided to patients undergoing invasive mechanical ventilation. The rehabilitation procedure will remain the same, and ICU teams will only record the number of procedures performed per day.

Inclusion criteria:

• Foreseeable invasive ventilation lasting more than 48 hours.
• Included within the first five days of an intensive care stay.

Exclusion criteria:

• Participation in an interventional study on early rehabilitation in the ICU
• Moribund patient
• Pregnant or breastfeeding woman
• A person deprived of liberty by court order
• Not being affiliated to a social security scheme

Adult patients undergoing mechanical ventilation (MV) via an endotracheal tube for less than five days, in French-speaking intensive care units in three countries (France, Belgium and Switzerland), in whom MV is scheduled to last more than 48 hours.