The Coagulation and Protein C Pathways in Patients with Sleep Apnea

Department of Pulmonary and Critical Care Medicine, Mie University Graduate School of Medicine, Tsu-city, Mie, Japan.
Beiträge zur Klinik der Tuberkulose (Impact Factor: 2.17). 06/2009; 187(4):209-13. DOI: 10.1007/s00408-009-9152-8
Source: PubMed

ABSTRACT Patients with obstructive sleep apnea (OSA) have a high frequency of cardiovascular diseases and hypercoagulability is believed to be involved in the mechanism of those vascular events. We evaluated whether there is a dysfunction in the protein C anticoagulant pathway in patients with obstructive sleep apnea. Two hundred ninety-three patients were enrolled. To confirm the diagnosis of OSA, all-night polysomnography, including determination of SpO(2), was carried out. The apnea-hypopnea index (AHI) was used for judging the presence of sleep-breathing disorder. The plasma levels of the thrombin-antithrombin complex were higher in patients with AHI > 5 than in those without OSA, defined as AHI < 5. However, there was no statistically significant difference in the plasma level of either activated protein C/alpha-antitrypsin complex or soluble thrombomodulin between patients with AHI > 5 and those with AHI < 5. The results of this study showed for the first time that markers of the protein C anticoagulant pathway are not affected in patients with OSA and that the protein C pathway is probably not involved in the mechanism of hypercoagulability in subjects with sleep-disordered breathing.

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