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Association of chronic obstructive pulmonary disease and obstructive sleep apnea consequences

Authors Zamarrón C, Paz VG, Morete E, del Campo Matías F

Published 5 December 2008 Volume 2008:3(4) Pages 671—682


Carlos Zamarrón1, Vanesa García Paz1, Emilio Morete1, Felix del Campo Matías2

1Servicio de Neumología, Hospital Clínico Universitario de Santiago, Santiago, Spain; 2Servicio de Neumologia, Hospital Universitario Rio Ortega de Vallaclolid, Vallaclolid, Spain

Abstract: Obstructive sleep apnea syndrome (OSAS) and chronic obstructive pulmonary disease (COPD) are two diseases that often coexist within an individual. This coexistence is known as overlap syndrome and is the result of chance rather than a pathophysiological link. Although there are claims of a very high incidence of OSAS in COPD patients, recent studies report that it is similar to the general population. Overlap patients present sleep-disordered breathing associated to upper and lower airway obstruction and a reduction in respiratory drive. These patients present unique characteristics, which set them apart from either COPD or OSAS patients. COPD and OSAS are independent risk factors for cardiovascular events and their coexistence in overlap syndrome probably increases this risk. The mechanisms underlying cardiovascular risk are still unclear, but may involve systemic inflammation, endothelial dysfunction, and tonic elevation of sympathetic neural activity. The treatment of choice for overlap syndrome in stable patients is CPAP with supplemental oxygen for correction of upper airway obstructive episodes and hypoxemia during sleep.

Keywords: chronic obstructive pulmonary disease, obstructive sleep apnea syndrome, overlap syndrome, sleep, cardiovascular disease

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