Predictive Validity of the Chelsea Critical Care Physical Assessment Tool (CPAx) for Regaining Autonomy Three Months After ICU Discharge

Inclusion Criteria: * Patient affiliated with, or entitled to benefit from, a French social security system. * Patient who has received clear and comprehensive information about the study and has signed the informed consent form together with the investigator. * Age ≥ 18 years. * Having received at least 48 hours of invasive mechanical ventilation. * Previous hospitalization in the intensive care unit (ICU) at CHI Elbeuf-Louviers-Val-de-Reuil. * Prescription of physiotherapy during the ICU stay. * Eligible for the 3-month post-ICU follow-up in the day hospital based on at least one of the following criteria: * Mechanical ventilation or catecholamine treatment (norepinephrine) for ≥ 5 days; * Weight loss ≥ 5% during hospitalization (criterion for malnutrition); * Significant muscle weakness (MRC score \< 28/60); * Presence of post-traumatic stress symptoms related to ICU stay (evaluated by the psychologist). * Ability to walk (with or without assistive devices) prior to ICU admission. Exclusion Criteria: * Patient not affiliated with the French national health insurance system. * Documented pre-existing cognitive impairment likely to limit understanding of instructions and participation in functional assessments (e.g., dementia, intellectual disability, severe uncontrolled psychiatric disorder). * History of disabling chronic neuromuscular disease (e.g., amyotrophic lateral sclerosis, myopathy, progressive chronic polyneuropathy). * History of major pre-existing locomotor impairment preventing autonomous walking (e.g., paraplegia, uncompensated disabling arthropathy). * Refusal to participate in the study or withdrawal of consent at any time. * Person under legal guardianship, curatorship, or any other legal protection measure. * Simultaneous participation in another interventional study likely to interfere with the evaluation criteria of the present study. * Medical contraindication to performing the 6-minute walk test at 3 months (e.g., cardiovascular decompensation, acute pulmonary disease, persistent hemodynamic instability).