@article {Dos SantosPA549, author = {Courtney Dos Santos and Martin Samuels and Aidan Laverty and Emma Raywood}, title = {Comparison of oxygen desaturation index and apnoea-hypopnoea index for categorising OSA in children.}, volume = {52}, number = {suppl 62}, elocation-id = {PA549}, year = {2018}, doi = {10.1183/13993003.congress-2018.PA549}, publisher = {European Respiratory Society}, abstract = {Background: Increased numbers of referrals for cardiorespiratory sleep studies are being received for Ear, Nose and Throat (ENT) patients (without accompanying co-morbidities); these studies help diagnose Obstructive Sleep Apnoea (OSA). Increased patient numbers have made quick diagnosis difficult. The aim was to assess if Oxygen Desaturation Index (ODI) could be used as a surrogate for Apnoea-Hypopnoea Index (AHI) to diagnose OSA, in patients with no comorbidities.Methods: The laboratory database (Microsoft Access) was used to retrieve sleep study data (recorded using Embla S4500 and analysed by physiologists) for ENT patients from the two most frequent general hospital referrers over the past 8 months. Data retrieved included: department sleep questionnaire, AHI, ODI and outcome. Both ODI and AHI were ranked for severity using AASM (Berry R.B. et al, American Academy of Sleep Medicine, 2017) criteria: Normal \<1; Mild 1-5; Moderate 5-10; Severe \>10; the patients were grouped accordingly.Results: Data was collected from 154 patients (104 male, 50 female) aged from 10 months to 15 years (Median 4.29yrs). Spearman{\textquoteright}s Rho test showed positive correlation between AHI \& ODI [rs=0.862 (p=\<0.001)]. The area under the receiver operator characteristic curve for patients with mild OSA patients was 0.827, compared to 0.993 for severe OSA.Conclusions: This data indicates that should the AASM criteria for scoring OSA severity by AHI, be applied to ODI, this could be a good indicator for the correct AHI, particularly in the severe category of patients (99.3\%). There may be other reasons why at milder levels, the sensitivity is poorer, such as patient age, or inter-scorer variation affecting the AHI.FootnotesCite this article as: European Respiratory Journal 2018 52: Suppl. 62, PA549.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).}, issn = {0903-1936}, URL = {https://erj.ersjournals.com/content/52/suppl_62/PA549}, eprint = {https://erj.ersjournals.com/content}, journal = {European Respiratory Journal} }