Blood Markers of Inflammation, Blood Clotting and Blood Vessel Function in HIV-infected Adults
|First Received Date ICMJE||October 18, 2008|
|Last Updated Date||March 5, 2014|
|Start Date ICMJE||October 2008|
|Primary Completion Date||Not Provided|
|Current Primary Outcome Measures ICMJE||Not Provided|
|Original Primary Outcome Measures ICMJE||Not Provided|
|Change History||Complete list of historical versions of study NCT00776412 on ClinicalTrials.gov Archive Site|
|Current Secondary Outcome Measures ICMJE||Not Provided|
|Original Secondary Outcome Measures ICMJE||Not Provided|
|Current Other Outcome Measures ICMJE||Not Provided|
|Original Other Outcome Measures ICMJE||Not Provided|
|Brief Title ICMJE||Blood Markers of Inflammation, Blood Clotting and Blood Vessel Function in HIV-infected Adults|
|Official Title ICMJE||Biomarkers of Inflammation, Coagulation, and Endothelial Function in HIV-Infected Adults|
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)
In some cases, visits 1 and 2 may be combined.
Optional additional visits (up to 8 visits over 3 years)
D-dimer, a fibrin degradation product generated as a result of plasmin mediated clot dissolution processes, is an indicator of recent clot formation and subsequent fibrinolysis. Analysis of D-dimer concentration is employed in the diagnosis of deep vein thrombosis, pulmonary embolism, and disseminated intravascular coagulation. More recently, D-dimer levels have been correlated with atherosclerotic cardiovascular disease. In a recent case-control study of biomarkers for cardiovascular disease in human immunodeficiency virus (HIV)-infected adults, baseline D-dimer levels strongly correlated with all-cause mortality. Notably, the association between baseline D-dimer levels and death due to cardiovascular disease was less significant.
At present, the pathophysiology underlying the association of elevated D-dimer concentrations with mortality in HIV is not understood. This study seeks to identify possible mechanisms underlying D-dimer elevations in HIV-infected adults by investigating a number of pathways that may be associated with the elevations using biomarkers of inflammation, hemostasis, thrombosis, platelet function, lipid metabolism, and additional indicators of endothelial function. Further elucidation of plausible pathways contributing to D-dimer elevation could, ultimately, lead to trials of risk-reducing interventions for patients with an elevated D-dimer level.
This study, an exploratory, cross-sectional study of up to 325 subjects, seeks to prospectively collect data on D-dimer and related biomarkers in HIV-infected adults. Initially, the study will recruit HIV-infected adults with HIV viremia who are not taking antiretroviral therapy (ART) and compare their clinical histories and biomarker findings with those from (1) a group of HIV-infected adults with controlled HIV viremia who are receiving ART, and with those from (2) a control group of HIV-negative healthy subjects. Additionally, to study the impact of persistent immune activation and inflammation on immune responses to ART, a cohort of HIV-infected adults with poor CD4+ cell recovery despite effective ART, and to better understand the mechanisms that contribute to impaired immunologic recovery, a cohort of HIV-infected adults with poor CD4+ cell recovery despite effective ART will be enrolled (immunologic non-responder cohort) and for comparison, a control group with similar nadir CD4 counts but with good CD4+ cell recovery on ART.
The study requires 2 visits for screening, history and physical examination, and phlebotomy. A wide array of research assays investigating different aspects of inflammation, coagulation, and endothelial function will be completed. Samples will be stored for future investigation.
|Study Type ICMJE||Observational|
|Study Design ICMJE||Time Perspective: Prospective|
|Target Follow-Up Duration||Not Provided|
|Sampling Method||Not Provided|
|Study Population||Not Provided|
|Intervention ICMJE||Not Provided|
|Study Group/Cohort (s)||Not Provided|
* Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
|Recruitment Status ICMJE||Recruiting|
|Estimated Enrollment ICMJE||375|
|Completion Date||Not Provided|
|Primary Completion Date||Not Provided|
|Eligibility Criteria ICMJE||
For HIV-negative subjects:
- No known history of HIV infection. At enrollment, HIV antibody testing will be performed to confirm negative HIV-1 antibody status.
For HIV-positive subjects:
For HIV-positive subjects enrolling in the immunologic non-responder cohort:
|Ages||18 Years and older|
|Accepts Healthy Volunteers||No|
|Location Countries ICMJE||United States|
|NCT Number ICMJE||NCT00776412|
|Other Study ID Numbers ICMJE||090013, 09-I-0013|
|Has Data Monitoring Committee||Not Provided|
|Responsible Party||Not Provided|
|Study Sponsor ICMJE||National Institute of Allergy and Infectious Diseases (NIAID)|
|Collaborators ICMJE||Not Provided|
|Information Provided By||National Institutes of Health Clinical Center (CC)|
|Verification Date||March 2013|
ICMJE Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP