RT Journal Article SR Electronic T1 Screening for obstructive sleep apnea (OSA) in patients referred for bariatric surgery JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP PA830 DO 10.1183/13993003.congress-2019.PA830 VO 54 IS suppl 63 A1 Raphaël Lukaszewicz A1 Antoine Grégoire A1 Samuel Dolidon A1 Marie Netchitailo A1 Florence Portier A1 Antoine Cuvelier A1 Maxime Patout YR 2019 UL http://erj.ersjournals.com/content/54/suppl_63/PA830.abstract AB Introduction: Screening for OSA is recommended prior to bariatric surgery. Given the increased incidence of obesity and limited access to respiratory polygraphy (PG), a more pragmatic approach is needed. Our aim was the diagnostic value of daytime tests for the screening of severe OSA in patients referred for respiratory review prior to bariatric surgery.Methods: Retrospective monocentric study that included patients referred for respiratory review prior to bariatric surgery from 05/2017 to 04/2018. All patients underwent systematic clinical exam, arterial blood gas (ABG), and overnight PG.Results: From 120 patients referred for respiratory review, 99 (83%) underwent PG. Twenty (20%) were diagnosed with severe OSA. In univariate analysis, patients with severe OSA were more likely to be male (RR:1.6; p:0.003) and to have diabetes (RR:1.4; p:0.048). Patients with severe OSA had a higher BMI: 48 [42-54] vs 42 [40-45] kg/m2 (p:0.014), higher neck circumference (NC): 46 [43-49] vs 41 [39-43] cm (p<0.001), higher PaCO2: 5.13 ±0.40 vs 4.80 ±0.39 kPa (p:0.001), higher bicarbonates: 24.2 [23.2-25.0] vs 23.1 [21.9-24.4] mmol/L (p:0.041), lower PaO2: 10.6 ±1.2 vs 12.1 ±1.5 kPa (p<0.001) and saturation (SO2): 95.9 [95.1-96.5] vs 97.1 [96.4-97.7] % (p<0.001). Epworth sleepiness scale was similar between groups (p:0.349). The combination NC+(100-SO2) at a cut-off value of 46.3 had a sensitivity, specificity, positive and negative predictive value of 95%, 71%, 46%, 98%. This score had better performances than STOP-BANG (area under the curve: 0.833 vs 0.684). Using this score as a screening tool could have reduced the number of PG by 55%.Conclusions: In our cohort, ABG and morphometry safely overruled OSA.FootnotesCite this article as: European Respiratory Journal 2019; 54: Suppl. 63, PA830.This is an ERS International Congress abstract. No full-text version is available. Further material to accompany this abstract may be available at www.ers-education.org (ERS member access only).