This study will collect information about markers of inflammation, blood clotting and blood vessel function in HIV-infected adults and healthy volunteers. Biomarkers are biological indicators that have been associated with disease. Certain markers of inflammation, blood clotting, and blood vessel function have been associated with risk of cardiovascular disease, stroke and death. One marker, called D-dimer, is a breakdown product of blood clots that has been associated with serious medical conditions, including deep vein thrombosis (formation of a blood clot in a vein deep in the body) and pulmonary embolism (blockage in the pulmonary artery that occurs when a blood clot from a vein breaks away, travels to the pulmonary artery and lodges there). High D-dimer levels have also been associated with cardiovascular disease and stroke risk. In a recent study of HIV-infected patients, higher D-dimer levels were strongly correlated with risk of death from any cause. The significance of changes in D-dimer and other biomarkers in HIV-infected adults is not well understood. This study will further explore D-dimer and other biomarkers to try to better understand the relationships between them and HIV infection. Healthy volunteers and HIV-infected adults 18 years of age or older may be eligible for this study. Two visits are involved, as follows: Visit 1 (screening visit to determine eligibility) * Medical history and physical examination. * Blood tests for HIV infection, blood counts, liver and kidney function. * Pregnancy test for women who can become pregnant. Visit 2 * Blood tests for hepatitis B and C * Blood tests for markers of inflammation and blood clotting. * Blood test for genetic changes that influence blood clotting. In some cases, visits 1 and 2 may be combined. Optional additional visits (up to 8 visits over 3 years) * Additional blood draws for investigation of specific clinical or laboratory findings may be requested.
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Obtain blood samples for further investigation into the correlation between markers of coagulation, including D-dimer, and markers of platelet function, inflammation, endothelial cell function, and clinical parameters in HIV-infected adults.
Timeframe: Cross-sectional and longitudinal