Association of High-Risk Obstructive Sleep Apnea with Microvascular Complications in Adults with Type 1 Diabetes...

Background: Obstructive sleep apnea (OSA) is a common but underrecognized sleep-related breathing disorder characterized by intermittent hypoxemia and autonomic dysfunction. OSA prevalence and clinical relevance in Type 1 Diabetes Mellitus (T1DM), particularly in relation to diabetes-related vascular complications, remain insufficiently explored. Objective: The aim of this study was to evaluate the prevalence of high-risk OSA in adults with T1DM and controls, and to investigate the association between high-risk OSA and microvascular complications among individuals with T1DM. Methods: In this cross-sectional case-control study, 102 adults with T1DM and 126 controls were included. OSA risk was assessed using the modified Berlin Questionnaire (mBQ). Analyses of vascular complications were restricted to participants with T1DM. Multivariable logistic regression models adjusted for age and sex were used to assess associations, with additional adjustments for body mass index, hypertension, current smoking, alcohol use and glycated hemoglobin A1c. Results: High-risk OSA was identified in 18.6% of individuals with T1DM and 11.9% of controls, with no significant difference between groups. Among participants with T1DM, the prevalence of microvascular complications (retinopathy and/or neuropathy) was substantially higher in those with high-risk OSA compared with those at low risk (68.4% vs. 18.07%, p <0.001). In univariate logistic regression analysis, high-risk OSA was significantly associated with microvascular complications (odds ratio [OR] 4.85; 95% confidence interval [CI] 1.65-14.24; p = 0.004). This association remained significant in the fully adjusted model (OR 5.55; 95% CI 1.36-22.65; p = 0.017). Conclusions: High-risk OSA is not more prevalent in adults with T1DM compared with controls; however, among individuals with T1DM, high-risk OSA is strongly and independently associated with microvascular complications. Given the potential contribution of diabetic microvascular and autonomic neuropathy to upper airway dysfunction, the relationship between OSA and vascular complications in T1DM may be bidirectional, warranting further longitudinal investigation.