TY - JOUR T1 - Oxidative stress in children with OSAS: Role of urinary 8-isoprostane JF - European Respiratory Journal JO - Eur Respir J VL - 38 IS - Suppl 55 SP - 3240 AU - Susanna Bonafoni AU - Susanna Fedeli AU - Valentina Negro AU - Maria Chiara Supino AU - Maria Chiara Paolino AU - Rosa Castaldo AU - Manuela Cecili AU - Maurizio Simmaco AU - Maria Pia Villa Y1 - 2011/09/01 UR - http://erj.ersjournals.com/content/38/Suppl_55/3240.abstract N2 - Background: In Obstructive Sleep Apnea Syndrome (OSAS), the key role of airway inflammation is confirmed. Studies about noninvasive methods and new markers of inflammation in diagnosis and management of pediatric OSAS are increasing. 8-IsoP is an oxidative stress marker.The study of this marker in urines of children with OSAS could be promising.Aim: To evaluate urinary 8-IsoP values in children with OSASMethods: Twenty children (mean age 6.33±2.06, M/F:12/8), with referred OSAS, underwent urinary collection at the morning after the polysomnography, sleep questionnaire, medical examination. 8-IsoP was assessed in urinary sample.Results: According to the AHI (Apnoea/Hypopnea index) obtained from the polysomnography, we found 13 subjects (group1) with primary snoring/minimum OSAS (mean AHI 1.89±1.80; mean SaO2 97.59±0.59) and 7 subjects (group2) with moderate/severe OSAS (mean AHI 14.65±11.09; mean SaO2 96.04±2.98). The urinary 8-IsoP values is higher in Group 2 (respectively Group1:0,72±0,57 ng/ml vs Group2: 2.19±1.29 ng/ml, p=0.01). Moreover we found a positive correlation between AHI and urinary 8Iso-P (r= 0,5; p=0,02). The linear regression analysis, performed using as dependent variable values of urinary 8-Isop and as independent variables severity of OSAS, age, sex, AHI, SaO2, Prick test, BMI percentile, adenotonsillar ipertrophy, showed that the severity of OSAS was the only predictor for levels of urinary 8-Isop (R Square: 0.415).Conclusion: Our data show that values of urinary 8-IsoP are related to OSAS severity. Further studies are needed to assess the utility of urinary 8-Isop as marker of inflammation likely due to oxidative stress. ER -