alexa A controlled trial of CPAP therapy on metabolic control in individuals with impaired glucose tolerance and sleep apnea.
Infectious Diseases

Infectious Diseases

Epidemiology: Open Access

Author(s): Weinstock TG, Wang X, Rueschman M, IsmailBeigi F, Aylor J,

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Abstract STUDY OBJECTIVES: To address whether treatment of sleep apnea improves glucose tolerance. DESIGN: Randomized, double-blind crossover study. SETTING: Sleep clinic referrals. PATIENTS: 50 subjects with moderate to severe sleep apnea (AHI > 15) and impaired glucose tolerance. INTERVENTIONS: Subjects were randomized to 8 weeks of CPAP or sham CPAP, followed by the alternate therapy after a one-month washout. After each treatment, subjects underwent 2-hour OGTT, polysomnography, actigraphy, and measurements of indices of glucose control. MEASUREMENTS AND RESULTS: The primary outcome was normalization of the mean 2-h OGTT; a secondary outcome was improvement in the Insulin Sensitivity Index (ISI (0,120). Subjects were 42\% men, mean age of 54 (10), BMI of 39 (8), and AHI of 44 (27). Baseline fasting glucose was 104 (12), and mean 2-h OGTT was 110 (57) mg/dL. Seven subjects normalized their mean 2-h OGTT after CPAP but not after sham CPAP, while 5 subjects normalized after sham CPAP but not after CPAP. Overall, there was no improvement in ISI (0,120) between CPAP and sham CPAP (3.6\%; 95\% CI: [-2.2\%, 9.7\%]; P = 0.22). However, in those subjects with baseline AHI ≥ 30 (n = 25), there was a 13.3\% (95\% CI: [5.2\%, 22.1\%]; P < 0.001) improvement in ISI (0,120) and a 28.7\% (95\%CI: [-46.5\%, -10.9\%], P = 0.002) reduction in the 2-h insulin level after CPAP compared to sham CPAP. CONCLUSIONS: This study did not show that IGT normalizes after CPAP in subjects with moderate sleep apnea and obesity. However, insulin sensitivity improved in those with AHI ≥ 30, suggesting beneficial metabolic effects of CPAP in severe sleep apnea. Clinical trials information: ClinicalTrials.gov Identifier: NCT01385995.
This article was published in Sleep and referenced in Epidemiology: Open Access

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