Clinical Studies into the Causes of Idiopathic Macular Telangiectasia Type 2: Sleep Apnoea and Macular Telangiectasia: The SAMTel Project

Purpose: To assess the prevalence of Obstructive Sleep Apnoea (OSA) in a population with Macular Telangiectasia Type 2 (MacTel) and how OSA impacts on MacTel progression. Methods: In this case-control study participants completed a questionnaire which incorporated the Berlin Questionnaire (BQ) and questions regarding anthropometric data and medical history. A subset was sequentially selected to undertake overnight sleep analysis using the ResMed ApneaLink™. Using data acquired from the Busselton Population and Medical Research Foundation participants were case-matched based on age, sex and body mass index (BMI) along with, where possible, the presence of hypertension and diabetes. Results: There were 57 (30 ApneaLink) MacTel and 183 controls, respectively. There was no difference in self-reported sleep disordered breathing outcomes between the cohorts using the BQ (p=0.95). Analysis of key indices from ApneaLink recordings found that those with an Apnoea – Hypopnoea Index (AHI) and Oxygen Desaturation Index (ODI) > 5 episodes per hour had a more advanced stage of MacTel (AHI p = 0.05, ODI p = 0.03). 2 year MacTel disease progression rates were unremarkable. Conclusion: Patients with MacTel have a high prevalence of OSA which appears to result in a more advanced form of the disease

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