P010 Success and failure rates of ambulatory home sleep studies (Level 2) among Indigenous patients

INTRODUCTION/AIM: Level 2 sleep studies are being increasingly performed worldwide in order to minimise the cost and access to level1 in-lab polysomnography. However, their accuracy and validity remain disputed. For populations residing in regional and remote localities, access to level1 sleep studies are further compromised, such as among Indigenous people of Australia, where 80% reside in remote communities. There is limited information in the literature regarding the efficacy of level2 sleep studies among Indigenous patients. Hence, in this study we evaluated the efficacy of level2 sleep studies amongst an Indigenous population. METHODS: 552 level2 sleep studies from Indigenous patients recorded between 2011-2020 were included. Sleep studies were analysed and scored manually by registered polysomnographic technologist as per standard guidelines. The studies were also assessed to determine the soundness of the study. Demographic and clinical information of patients was also collected. RESULTS: 50% of the patients were female, and 51% resided in remote or very remote locations. Of the 552 studies, 47(8.5%) were failed. There was no significant differences in demographic factors between failed and successful studies. The most common reason for failure was intolerance of the sensors which resulting in removing the device. CONCLUSION: Level 2 sleep studies showed high success rate amongst this Indigenous population with just 8.5% failure rate. As there is limited access to level 1 sleep studies among the Indigenous Australian population due to remoteness, this study shows that level 2 sleep studies are a feasible alternative in the diagnosis for the presence of sleep disorders.