RT Journal Article SR Electronic T1 Polysomnographic and Clinical Characteristics of Positional Obstructive Sleep Apnea Patients JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP PA2498 DO 10.1183/13993003.congress-2021.PA2498 VO 58 IS suppl 65 A1 Sagmen, Seda Beyhan A1 Comert, Sevda Sener YR 2021 UL https://publications.ersnet.org//content/58/suppl_65/PA2498.abstract AB positional OSAnon-positional OSAP valueAge46,78±9,6650,90±10,96<0,001BMI29,39±3,8033,30±6,45<0,001Neck circumflex42,25 ± 2,6343,49 ± 2,580,001Gender (M/F)61/27117/750,176Aim: We aimed to compare clinical, polysomnographicparametresofpatientswithpositional andnonpositionalOSAMaterial and method: This retrospective study was conducted during January2017andSeptember2018inatertiarycarecenterIstanbul. Acompleterecordof310patientswhowerepresented to our sleep center andunderwent polysomnography (PSG) was performed.30ofthesepatientswereexcluded becauseofcongestiveheart failure, chroniclungdiseaseandcentralsleepapneapatientsweredividedintotwo groups according toPSGaspositionalOSApatients(group1)andnonpositionalOSApatients(group2)Age, gender, BMI, neckcircumflex, polysomnographicparametreswereevaluated.Results: Atotalof280 patientsmadeupof102women and 178menwereincludedinthisstudy. Themeanageof group1(46,78±9,66) was found to be significantly lower than the mean age of group2(50,90±10,96)(p<0,001)The meanbodymassindexandneckcircumflexof group1werelowerthanthoseofgroup2(p<0,001)Sleeptime, Sleepefficiency(%)minimumoxygensaturation, meanoxygensaturation of group1wassignificantlyhigherthan those of group2. AHI, AI, ODI, TST%90, heart rate and PLM index of group1 were lower than group2. The rate of sleep apnea severity in group1(7.95%)waslowerthan in group2(53.65%). In bloodgasanalysis, themeanPO2ingroup1(91.26 ± 19.29)washigherthaningroup2(85.21±17.63)(p:0,030)meanSO2ingroup1(96.83±2.80)washigherthaningroup2(95.63±3.81)) (p:0,001).Conclusion: Inthelightofthesedata, itwasdeterminedthatpositionalOSApatientswereyounger andlowerweightandtheseverityofthediseasewaslesscommoninpositionalOSApatientsFootnotesCite this article as: European Respiratory Journal 2021; 58: Suppl. 65, PA2498.This abstract was presented at the 2021 ERS International Congress, in session “Prediction of exacerbations in patients with COPD”.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).