TY - JOUR T1 - Applying positive pressure in airway in two moments: Post-anesthetic recovery and 1<sup>st</sup> postoperative day JF - European Respiratory Journal JO - Eur Respir J DO - 10.1183/13993003.congress-2015.PA3708 VL - 46 IS - suppl 59 SP - PA3708 AU - Eli Maria Pazzianotto-Forti AU - Patrícia Brigatto AU - Letícia Baltieri AU - Carolina Moraes AU - Maura Rocha AU - Irineu Rasera-Júnior Y1 - 2015/09/01 UR - http://erj.ersjournals.com/content/46/suppl_59/PA3708.abstract N2 - Rationale: The application of positive pressure in the airway can contribute to the restoration of lung volumes, capacities and prevent respiratory complication. The aim was to investigate the use of Bilevel Positive Airway Pressure (BIPAP) in morbidly obese patients in two moments of the postoperative bariatric surgery: in the post-anesthetic recovery (PAR) and on the 1st postoperative day (1stPO).Methods: 20 morbidly obese, aged between 25 and 55 years, underwent pulmonary function test and chest x-ray preoperatively and on the day of discharge. They were randomly allocated in two groups. GPAR: received BIPAP treatment, immediately after surgery in PAR, for an hour and G1stPO: received BIPAP treatment postoperatively (PO) for one hour, on the 1st PO day.Results: There were significant reductions in slow vital capacity (SVC)(p=0.0007), inspiratory reserve volume (IRV) (p=0.0016) and forced vital capacity (FVC) (p=0.0013) in the postoperative in GPAR and the expiratory reserve volume (ERV) remained (p=0.4446). In the G1stPO, there was significant reductions for: SVC p=&lt;0.0001, ERV p=0.0191, IRV p= 0.0026 e FVC p=&lt;0.0001. Comparing the differences, between groups, the SVC (p=0.0027) and FVC (p=0.0028) showed significant smallest decrease in the GPAR. To the ERV (p= 0.1646) and IRV (p=0.3973), there were no significant difference between groups.The atelectasis prevalence was 10% for the GPAR and 30% for G G1stPO, with significant difference (p = 0.0027).Conclusions: The lowest reduction in SVC and FVC happens when positive pressure is in the PAR. Thus, the use of BIPAP in the PAR can promote a restoration of ERV and contribute to reduction of atelectasis. FAPESP 2013/06334-8. ER -