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Chronic pain was defined as chronic use (>6 months) of long-acting opiates. Deep veinthrombosis was diagnosed by Doppler ultrasound. Pulmonary embolism was diagnosed by CT-pulmonary angiogram. We did not include clinical variables for the walk-PHaSST cohort, as this study relied on patient's self-report http://www.selleckchem.com/products/PF-2341066.html of complications without validation through chart abstraction. To minimize the confounding effect of platelet activation and degranulation ex vivo, possibly leading to artifactual elevation of TSP1 levels, we avoided or minimized the use of a tourniquet for arm occlusion whenever possible. Blood samples from patients and controls at the UPMC Adult Sickle Cell Program were collected in citrated tubes and immediately transferred to laboratory facilities adjacent to the collection sites at 4��C. The tubes were inverted 8�C10 times and then subjected to double centrifugation at 1,500g at 4��C to obtain platelet poor plasma (PPP). The supernatant was aliquoted into cryotubes and stored at ?80��C until the day of testing by ELISA. On the day of plasma collection for TSP1 testing, patients also underwent routine blood testing as indicated by their clinical care. PPP from the UPMC cohort and whole plasma from the walk-PHaSST cohort were thawed and assessed in parallel for levels of TSP1 in the clinical laboratory of The Institute for Transfusion Medicine (ITXMSM)(Pittsburgh, PA) or at the translational http://www.selleckchem.com/products/r428.html core laboratory for the Division of Pulmonary, Allergy and Critical Care Medicine (University of Pittsburgh, Pittsburgh, PA). TSP1 was measured by ELISA in duplicate (R&D Systems, Minneapolis, MN). Data were analyzed using SAS (v. 9.1.3, Cary NC) or STATA 10.1 (College Station, TX). Comparisons of TSP1 levels between patients in steady state and VOE were compared by Mann-Whitney U test. Log-transformed TSP1 levels were also compared using the parametric two-sample t-test. The association between TSP1 and biomarkers, log-transformed as needed to meet normality assumptions, was determined by examining scatter plots and correlation coefficients. Each variable that was univariately associated with TSP1 (P http://www.selleck.cn/products/3-methyladenine.html correlates remained associated with TSP1 after adjustment for all other correlates. Assumptions in linear regression were checked using residuals. We also used the Variance Inflation Factor to check for collinearity in the final model. TSP1 was adjusted for study site in the walk-PHaSST study using residuals from a linear regression analysis. A hemolytic component was generated by Principal Component Analysis of the levels of lactate dehydrogenase, aspartate aminotransferase, bilirubin, and reticulocyte count as previously described [25]. Briefly, the hemolytic component is a normalized factor of the four hemolytic variables with mean of 0 and SD of 1.