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| Tracking Information | |
|---|---|
| First Received Date ICMJE | May 25, 2000 |
| Last Updated Date | June 23, 2005 |
| Start Date ICMJE | September 1995 |
| Primary Completion Date | |
| Current Primary Outcome Measures ICMJE | |
| Original Primary Outcome Measures ICMJE | |
| Change History | Complete list of historical versions of study NCT00005482 on ClinicalTrials.gov Archive Site |
| Current Secondary Outcome Measures ICMJE | |
| Original Secondary Outcome Measures ICMJE | |
| Descriptive Information | |
| Brief Title ICMJE | Homocyst(e)Ine, Vitamin Status, and CVD Risk |
| Official Title ICMJE | |
| Brief Summary | To test the hypotheses that the risk of myocardial infarction and/or stroke is associated with elevated plasma levels of homocysteine, and low plasma levels of folate, vitamins B12 and B6. |
| Detailed Description | BACKGROUND: Elevated plasma homocyst(e)ine is a risk factor for vascular disease in middle-aged men. Supplementation with folate, and to some extent vitamins B12 and B6, can reduce plasma homocyst(e)ine levels. There is also evidence from in vitro studies that the adverse atherogenic or thrombotic effects of Lp(a) may be greatly enhanced by homocyst(e)ine. The high prevalence of low levels of folate and vitamins B12 and B6 among the elderly in the United States has led to the hypothesis that a substantial portion of cardiovascular morbidity and mortality among older persons could be prevented by increasing intake of these nutrients to reduce plasma levels of homocysteine. Little is known, however, regarding the relationship of homocysteine, folate, B vitamins, and Lp(a) to cardiovascular disease among the elderly, among whom CVD represents the leading cause of morbidity and mortality. DESIGN NARRATIVE: In this ancillary study to the prospective Cardiovascular Health Study (CHS), a case-cohort design was used to test hypotheses that the risk of myocardial infarction and/or stoke was associated with elevated plasma levels of homocysteine, and low plasma levels of folate, vitamins B12 and B6. Further, a determination was made whether elevated plasma levels of homocysteine and Lp(a) interacted to increase substantially the risk of myocardial infarction and/or stroke above that due to either factor alone. The sub-cohort was used to study the relationship between the factors under study and progression of sub-clinical atherosclerosis. For each case and sub-cohort member, an aliquot of fasting plasma drawn at baseline was analyzed for homocysteine, folate B12, and B6 concentrations. [Values of plasma Lp(a) were determined at baseline.] Results of these assays were combined with other CHS data to address the hypothesis that the risk of myocardial infarction and/or stroke was associated with elevated plasma levels of homocysteine, and low plasma levels of folate, vitamins B12 and B6. |
| Study Phase | |
| Study Type ICMJE | Observational |
| Study Design ICMJE | Natural History |
| Condition ICMJE |
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| Intervention ICMJE | |
| Study Arms / Comparison Groups | |
| Publications * | |
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* Includes publications given by the data provider as well as publications identified by National Clinical Trials Identifier (NCT ID) in Medline. |
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| Recruitment Information | |
| Recruitment Status ICMJE | Completed |
| Enrollment ICMJE | |
| Completion Date | March 1999 |
| Primary Completion Date | |
| Eligibility Criteria ICMJE | No eligibility criteria |
| Gender | Male |
| Ages | |
| Accepts Healthy Volunteers | No |
| Contacts ICMJE | Contact information is only displayed when the study is recruiting subjects |
| Location Countries ICMJE | |
| Administrative Information | |
| NCT ID ICMJE | NCT00005482 |
| Responsible Party | |
| Study ID Numbers ICMJE | 4969 |
| Study Sponsor ICMJE | National Heart, Lung, and Blood Institute (NHLBI) |
| Collaborators ICMJE | |
| Investigators ICMJE | |
| Information Provided By | National Heart, Lung, and Blood Institute (NHLBI) |
| Verification Date | June 2000 |
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ICMJE Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP |
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