T-piece Versus Pressure-support for the Spontaneous Breathing Trial

Inclusion Criteria: 1. Duration of mechanical ventilation prior to the first spontaneous brathing trial \> 24h 2. Patients at high-risk of reintubation according to the following criteria: Patients older than 65 years, or those having any underlying chronic cardiac or lung disease. 3. Patient meeting all weaning criteria according to the international conference consensus on weaning. * Respiratory rate ≤ 35 breaths per minute, * Adequate oxygenation defined as SpO2 \> 90% with FiO2 ≤ 0.4 or PaO2/FiO2 \> 150 mm Hg with positive end-expiratory pressure (PEEP) ≤ 8 cmH2O, * Adequate cough, * Patient awake with a Richmond Agitation-Sedation Scale between +1 and -2 * No continuous sedation, * Hemodynamic stability with no need for vasopressors (or minimal dosis). 4. Informed consent given by the relatives or the patient himself. Exclusion Criteria: 1. Patients admitted for traumatic brain injury 2. Pre-existing peripheral neuromuscular disease (underlying myopathy or myasthenia gravis) 3. Do-not-reintubate order at time of the first spontaneous breathing trial 4. Patient previously included in the study 5. No Health insurance coverage 6. People under protection: Pregnant or breastfeeding women, minor patients, subjects with guardianship or under law protection. 7. Refusal to participate