Protective cardiovascular effect of sleep apnea severity in obesity hypoventilation syndrome

Masa JF, Corral J, Romero A, Caballero C, Terán-Santos J, Alonso-Álvarez ML, Gomez-Garcia T, González M, López-Martínez S, De Lucas P, Marin JM, Marti S, Díaz-Cambriles T, Chiner E, Merchan M, Egea C, Obeso A, Mokhlesi B; Spanish Sleep Network, García-Ledesma E, Sánchez-Quiroga MÁ, Ordax E, González-Mangado N, Troncoso MF, Martinez-Martinez MÁ, Cantalejo O, Ojeda E, Carrizo SJ, Gallego B, Pallero M, Ramón MA, Díaz-de-Atauri J, Muñoz-Méndez J, Senent C, Sancho-Chust JN, Ribas-Solis FJ, Barrot E, Benítez JM, Sanchez-Gómez J, Golpe R, Santiago-Recuerda A, Gomez S, Bengoa M. Chest. 2016 Feb 25. pii: S0012-3692(16)01267-8.

BACKGROUND: Obesity hypoventilation syndrome (OHS) is associated with a high burden of cardiovascular morbidity (CVM) and mortality. The majority of OHS patients have concomitant obstructive sleep apnea (OSA), but there is a paucity of data on the association between CVM and OSA severity in patients with OHS. The objective of our study was to assess the association between CVM and OSA severity in a large cohort of patients with OHS.

METHODS: In a cross-sectional analysis, we examined the association between OSA severity based on tertiles of oxygen desaturation index (ODI) and CVM in 302 patients with OHS. Logistic regression models were constructed to quantify the independent association between OSA severity and prevalent CVM after adjusting for various important confounders.

RESULTS: The prevalence of CVM decreased significantly with increasing severity of OSA based on ODI as a continuous variable or ODI tertiles. This inverse relationship between OSA severity and prevalence of CVM was seen in the highest ODI tertile and it persisted despite adjustment for multiple confounders. Chronic heart failure had the strongest negative association with the highest ODI tertile. No significant CVM risk change was observed between the first and second ODI tertiles. Patients in the highest ODI tertile were younger, predominantly male, more obese, more hypersomnolent, had worse nocturnal and daytime gas exchange, lower prevalence of hypertension, better exercise tolerance and fewer days hospitalized than patients in the lowest ODI tertile.

CONCLUSION: In OHS patients, the highest OSA severity phenotype was associated with reduced risk of CVM. This finding should guide the design of future clinical trials assessing the impact of interventions aimed at decreasing cardiovascular morbidity and mortality in patients with OHS.

Ventana Cientifica. Mayo 2016. Artículo 129
Protective cardiovascular effect of sleep apnea severity in obesity hypoventilation syndrome


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