Wean Obese Study : Determination of the Optimal Spontaneous Breathing Trial for Obese Patient
The decision to extubate a patient after acute respiratory failure is based on clinical observation and measurement of pulmonary mechanics. Current extubation criteria(tidal volume, respiratory frequency...) lack of specificity. The best way to evaluate and predict patients breathing abilities after extubation is to challenge him to a spontaneous breathing trial (SBT) with endotracheal tube in place immediately before extubation to predict the patient's ability to breathe spontaneously after extubation. The intention is to approximate, while the patient is still intubated, the work of breathing that will be required of the patient after extubation. Different approaches of ventilatory settings are currently used for the preextubation SBT, whether pressure support ventilation (PSV), continuous positive airway pressure (CPAP), or spontaneous ventilation through an endotracheal tube (T piece), all supported by literature with different benefits. To the investigators knowledge, few studies define which mode of ventilation most closely approximates the work of breathing during spontaneous respiration after extubation, and none have studied a specific population of obese patient in respiratory weaning. The main objective of the investigators study is to determine, between five different SBT, which one is the best to approximate the work of breathing of obese patient after extubation.
PSV 7cmH2O PEEP 7cmH2O
PSV 7 cmH2O PEEP 0 cmH20
CPAP 7 cmH2O
PSV 0 cmH20 PEEP 0 cmH2O
Post-extubation in Spontaneous Breathing and/or in NIV
Procedure: Spontaneous breathing trial
|Study Design:||Endpoint Classification: Safety/Efficacy Study
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Diagnostic
|Official Title:||Wean Obese Study : Determination of the Optimal Spontaneous Breathing Trial for Obese Patient|
- Work of breathing [ Time Frame: Duration of hospital stay: one day ] [ Designated as safety issue: No ]Based upon the Campbell diagram, WOB will be calculated by integrating oesophageal pressure to tidal volume in time.
- Functional Residual Capacity [ Time Frame: Duration of hospital stay: one day ] [ Designated as safety issue: No ]Lung recruitement will be evaluated by a bed side technique of FRC mesurement.
|Study Start Date:||April 2012|
|Study Completion Date:||April 2013|
|Primary Completion Date:||April 2013 (Final data collection date for primary outcome measure)|
|Experimental: Spontaneous breathing trial||
Procedure: Spontaneous breathing trial
5 spontaneous breathing trial will be tested by the patients in the same order :
Patients : 20 obese patients (defined by BMI over 30 kg/m2) ongoing for spontaneous breathing trial and clinically ready for immediate extubation will be enrolled after obtaining their consents. Material : An oeso-gastric double balloon catheter will be inserted in order to record oesophageal and gastric pressure and to calculate Work of Breathing and Pressure Time Product. Pulmonary Volumes will be recorded by a pneumotachograph. Functional Residual Capacity will be recorded thanks to the azote double dilution technique used by the Engström respiratory care station.Study Protocol : When physicians in charge of the patient decided that the patient is ready to be weaned and to have a SBT before extubation, the patient will be included in the study. Before extubation, patients will be placed under 5 different spontaneous breathing trials conditions in the same order : 7 cm H2O continuous positive airway pressure, T piece,7 cmH2O of pressure support, 0 cmH20 of pressure support and 7 cm H2O pressure support ventilation with 7 cmH20 of end expiratory pressure. Each trial will be performed fo 20 min. Between 2 spontaneous breathing trials, and before extubation, patient will receive a 10 minutes period of recovery to their respiratory baseline, defined by the respiratory settings before the spontaneous breathing trials.The last step, after extubation, will consist in recording the data after 15 minutes, when patient's breathing pattern appears calm.