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- Title
Sleep-disordered breathing and prothrombotic biomarkers: cross-sectional results of the Cleveland Family Study.
- Authors
Mehra R; Xu F; Babineau DC; Tracy RP; Jenny NS; Patel SR; Redline S; Mehra, Reena; Xu, Fang; Babineau, Denise C; Tracy, Russell P; Jenny, Nancy S; Patel, Sanjay R; Redline, Susan
- Abstract
<bold>Rationale: </bold>Individuals with sleep-disordered breathing (SDB) are at increased cardiovascular risk, possibly due to SDB-related stresses contributing to atherosclerosis.<bold>Objectives: </bold>We postulate that pathways associated with a prothrombotic potential are up-regulated in SDB.<bold>Methods: </bold>Morning and evening plasminogen activator inhibitor-1 (PAI-1), morning fibrinogen, and morning D-dimer were measured in 537 Cleveland Family Study adults. Piecewise multivariable linear mixed models estimated relative mean change or mean change in the biomarker per 5-unit increase in apnea-hypopnea index (AHI) in two groups: AHI less than 15 and AHI greater than or equal to 15, and hypoxia defined as percentage of sleep time with Sa(O(2)) less than 90% (< 2%, ≥ 2%).<bold>Measurements and Main Results: </bold>Nonlinear associations were demonstrated: morning and evening PAI-1 increased by 12% (95% confidence interval [CI], 5-20%; P < 0.001) and 11% (95% CI, 2-20%; P = 0.01), respectively per 5-unit AHI increase until an AHI of 15, when no further increase in PAI-1 was demonstrated. The association between AHI and morning PAI-1 remained significant after adjusting for evening PAI-1 level (10%; 95% CI, 3-17%; P < 0.01). Morning fibrinogen increased on average by 8.4 mg/dl (95% CI, 3.12-13.65; P = 0.002) per five-unit AHI increase until an AHI of 15. There was no association between AHI and morning D-dimer. Hypoxia severity was not associated with thrombotic marker levels.<bold>Conclusions: </bold>PAI-1 and fibrinogen levels increase monotonically with AHI at degrees of SDB considered mildly to moderately abnormal, suggesting that even mild SDB levels may increase prothrombotic processes. There may be a plateau in this effect, occurring at levels considered to reflect only moderate SDB severity. These relationships with mild-to-moderate SDB were not observed with D-dimer.
- Publication
American Journal of Respiratory & Critical Care Medicine, 2010, Vol 182, Issue 6, p826
- ISSN
1073-449X
- Publication type
journal article
- DOI
10.1164/rccm.201001-0020OC