Sleep-disordered breathing and pregnancy.

Sleep-disordered breathing (SDB) refers to a group of disorders characterized by abnormal respiratory patterns or abnormal gas exchange during sleep. The most common type of SDB, especially among young obese women, is obstructive sleep apnea. SDB has clearly been linked to poor sleep and impaired daytime function, but there are also data linking SDB to other health outcomes, principally cardiovascular and metabolic disease. SDB symptoms are common in pregnancy, and pregnancy itself has been associated with an increase in the prevalence of SDB symptoms. Although a link between SDB and adverse pregnancy outcomes appears to be biologically plausible, data exploring this relationship are only now emerging, and large prospective studies in which the authors use objective measures of sleep are lacking. Until we know more about the epidemiology and the impact of SDB in pregnancy, screening efforts for SDB in pregnancy should be focused on identifying very symptomatic patients because treatment of these individuals often leads to improved sleep quality and daytime functioning.