Non Invasive Pressure Support Ventilation (NIPPV) Versus Recruitment Maneuver (RM) and Preoxygenation
|Study Design:||Allocation: Non-Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Subject, Investigator)
|Official Title:||Non Invasive Pressure Support Ventilation (NIPPV) Versus Conventionnal Approach and Early Recruitment Maneuver (RM) for Preoxygenation of Morbidly Obese Patient|
- Oxygenation (PaO2) measured 5min after the onset of mechanical ventilation [ Time Frame: 5 min after the oneset of mechanical ventilation ]
- - FRC after tracheal intubation and after 5 min of mechanical ventilation [ Time Frame: after 5 min of mechanichal ventilation ]
|Study Start Date:||February 2009|
|Study Completion Date:||August 2009|
|Primary Completion Date:||August 2009 (Final data collection date for primary outcome measure)|
Procedure: NIPPV and IRM
- non invasive positive pressure support ventilation (NIPPV group)
- alveolar recruitment maneuver (IRM group)
Atelectasis formation during general anesthesia, leading to reduced end-expiratory lung volume, is an important cause of intrapulmonary shunt leading to impaired gas-exchange and hypoxemia. During general anesthesia and the immediate postoperative period, morbidly obese patients, who develop a larger amount of atelectasis than non-obese patient, are more likely to present impairment of gas exchange and respiratory mechanics. Noninvasive positive-pressure support ventilation (NIPPV) and positive end-expiratory pressure (PEEP) are effective to provide oxygenation during intubation of hypoxemic patients. Recent data suggest that NIPPV enhances preoxygenation in morbidly obese patients. Moreover, the application of PEEP during induction of anesthesia prevents atelectasis formation and increases nonhypoxic apnea duration in obese patients despite the use of high-inspired oxygen fraction. However, the use of both NIPPV is widely used in the operating room, because of technical and materials constraints.
Several trials have demonstrated that alveolar recruitment maneuvers (RM) are effective to remove atelectasis and improve lungs mechanics and gas-exchange.
The purpose of this randomized and controlled study is to compare the effects of two ventilatory strategies during anesthesia induction of morbidly obese patients on both gas-exchange and functional residual capacity (FRC) modifications: 1- Control group: preoxygenation using 100% O2 via a face-mask and PEEP 10 cmH2O after intubation; 2- NIPPV group: preoxygenation using NIPPV and PEEP 10 cmH2O after intubation; 3- RM group: preoxygenation using 100% O2 via a face-mask and early RM plus PEEP 10 cmH2O after intubation.
Please refer to this study by its ClinicalTrials.gov identifier: NCT00852384
|University Hospital Hôtel-Dieu|
|Clermont-Ferrand, France, 63058|
|Principal Investigator:||Emmanuel Futier||University Hospital, Clermont-Ferrand|
|Study Director:||Jean-Michel Constantin||University Hospital, Clermont-Ferrand|