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pubmed-article:1446466pubmed:abstractTextTo assess the effects of long-term nasal continuous positive airway pressure (CPAP) in occlusive sleep apnea syndrome (OSA), 17 patients with severe symptomatic OSA had repeated spirometry, arterial blood gases, and nocturnal polysomnograms off nasal CPAP after 3 to 46 months of treatment with nasal CPAP. Without loss of weight or change in respiratory mechanics, the ventilatory disturbance index fell from a mean of 87 events per hour to 57 events per hour (p < 0.0001), correlating with an improvement in mean nocturnal desaturation with sleep-disordered breathing events (r = 0.54, p = 0.03). Moreover, the daytime PaO2 rose significantly from a mean of 69 mm Hg to a mean of 82 mm Hg (P = 0.0001) at follow-up. The rise in daytime PaO2 was not only due to the alleviation of daytime hypercapnea observed in eight of nine hypercapneic subjects since the P(A-a)O2 gradient also decreased significantly. The improvement in PaO2 correlated significantly with the number of months of CPAP therapy, suggesting a continuing effect over time (r = 0.58, p = 0.015). These results indicate that there is a reversible element of the severity of OSA and suggest a result of nasal CPAP therapy may be to reverse the adverse and time-dependent effects of hypoxemia and sleep fragmentation on ventilatory control in severe OSA.lld:pubmed
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pubmed-article:1446466pubmed:articleTitleNasal CPAP continues to improve sleep-disordered breathing and daytime oxygenation over long-term follow-up of occlusive sleep apnea syndrome.lld:pubmed
pubmed-article:1446466pubmed:affiliationDepartment of Medicine, Ottawa Civic Hospital, University of Ottawa, Ontario, Canada.lld:pubmed
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pubmed-article:1446466pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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