P031 Comparison of Level three sleep study against Level two studies in the diagnosis of OSA among Indigenous patients at the Top End Northern Territory of Australia

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Abstract Introduction/Aim Level three sleep studies are performed on portable devices which provide information on 3 channels. Some studies have reported that the accuracy of level 3 studies could be as accurate as polysomnography in a sub-set of population in the diagnosis of OSA. However, there is limited information in the literature regarding the effectivity of level 3 study in comparison to level 1 or level 2 study among Indigenous patients. Methods Patients included in this study were adult Indigenous patients identified to have undergone both level 2 and level 3 sleep study. We assessed the accuracy of diagnosing the presence of OSA as per AHI Results There were 12 indigenous patients identified to have undergone both level 2 and level 3 study. Four out of the 12 level 2 sleep studies failed due to sensor dropouts. Excluding patients with failed studies, 4 out of the 8 patients showed a higher AHI on their level 2 sleep study compared to level 3 study. Six patients had the same severity of OSA identified on both Level 2 and Level 3 studies. Conclusion This study shows mixed results in the efficacy of Level 3 studies compared to Level 2 studies, though failure rates may be lower on Level 3 studies. A larger sample size is required to further elaborate on the validity and efficacy of Level 3 studies in the diagnosis of OSA among indigenous Australian population. Grant Support Nil to declare and no funding received for this study