Published: 18 January 2022

Authors: Sara Q.C. Giampá, PhD Sofia F. Furlan, PhD Lunara S. Freitas, PhD Thiago A. Macedo, MD, PhD Adriana Lebkuchen, PhD Karina H.M. Cardozo, PhD Valdemir M. Carvalho, PhD Franco C. Martins, MD Indira F.B. Azam, RN Valéria Costa-Hong, PhD Heno F. Lopes, MD, PhD Mariana L. Baptista, MD Carlos E. Rochitte, MD, PhD Luiz A. Bortolotto, MD, PhD Geraldo Lorenzi-Filho, MD, PhD Luciano F. Drager, MD, PhD

Source: This abstract has been sourced from NZ Respiratory Research Review Issue 197


    OSA is associated with metabolic syndrome (MS), but it is unclear whether OSA treatment with CPAP can revert MS.

    Research Question

    Does OSA treatment with CPAP per se have effects on the MS reversibility and the associated metabolic, adiposity and vascular parameters?

    Study Design and Methods

    The TREATOSA-MS trial is a randomized placebo-controlled trial that enrolled adult patients with a recent diagnosis of MS and moderate or severe OSA (apnea-hypopnea index [AHI], ≥ 15 events/h) to undergo therapeutic CPAP or nasal dilator strips (placebo group) for 6 months. Before and after each intervention, we measured anthropometric variables, BP, glucose, and lipid profile. To control potential-related mechanisms and consequences, we also measured adiposity biomarkers (leptin and adiponectin), body composition, food intake, physical activity, subcutaneous and abdominal fat (visceral and hepatic fat), and endothelial function.


    One hundred patients (79% men; mean age, 48 ± 9 years; BMI, 33 ± 4 kg/m2; AHI, 58 ± 29 events/h) completed the study (n = 50 per group). The mean CPAP adherence was 5.5 ± 1.5 h/night. After 6 months, most patients with OSA randomized to CPAP retained the MS diagnosis, but the rate of MS reversibility was higher than observed in the placebo group (18% vs 4%; OR, 5.27; 95% CI, 1.27-35.86; P = .04). In the secondary analysis, CPAP did not promote significant reductions in the individual components of MS, weight, hepatic steatosis, lipid profile, adiponectin, and leptin, but did promote a very modest reduction in visceral fat and improved endothelial function (all analyses were adjusted for baseline values).


    Despite the higher rate of MS reversibility after CPAP therapy as compared with placebo, most patients retained this diagnosis. The lack of significant or relevant effects on adiposity biomarkers and depots supports the modest role of OSA in modulating MS.

    Trial Registration; No.: NCT02295202; URL:

    Link to abstract

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