Prevalence, Determinants and Consequences of Dyspnea During Weaning in Critically Ill Obese Patients

Inclusion Criteria: * Patients placed on mechanical ventilation for at least 48 hours * On spontaneous ventilation mode with inspiratory support (only possible ventilation mode during ventilation weaning) allowing a tidal volume \> 6 mL/kg and a positive end-expiratory pressure set by the attending physician between 5 and 8 cmH2O * Decision by the attending physician to perform a spontaneous breathing trial (SBT) after verifying the prerequisites for weaning: resolution of the acute phase of the illness for which the patient is placed on invasive mechanical ventilation, low bronchial congestion, adequate cough, adequate oxygenation defined by SpO2 \> 90% with FiO2 ≤ 40% and PEEP ≤ 8 cmH2O, respiratory rate ≤ 40 breaths/min, Ramsay sedation score \< 4, and stable cardiovascular state (heart rate ≤ 120 beats/min, systolic blood pressure ≤ 180 mmHg, and no or minimal vasopressors \[norepinephrine \< 5 μg/kg/min\]) * After information,no opposition from the patient or the relative (if the patient is unable to express his non opposition) to participating in the research * Person affiliated with a social security regime or eligible * Patient with a BMI \> 30 kg/m² for those included in the case group (obesity) Exclusion Criteria: * Under 18 years old * Pregnant or breastfeeding women * Patients for whom weaning is impossible (pre-existing neuromuscular disorders, cervical spinal cord lesions) * Patients for whom repeated dyspnea assessment is likely to be difficult (known history of cognitive or psychiatric disorders, delirium, Richmond Agitation-Sedation Scale score less than -2 or greater than 2) * Patients under legal protection measures (guardianship, curatorship)