- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT00353782
Causes and Natural History of Dyslipidemias
Disease Pathogenesis and Natural History of Lipid Disorders
This study will evaluate people with dyslipidemias - disorders that affect the fat content in the blood. Fats, or lipids, such as cholesterol and triglycerides, are carried in the blood in particles called lipoproteins. These particles are involved in causing blood vessel diseases that can lead to conditions like atherosclerosis (hardening of the arteries) or heart attack. Participants will undergo accepted medical tests and procedures to evaluate their condition. Most of the test results are helpful in making a diagnosis and in guiding treatment.
People with lipid disorders are eligible for this study. Representative types of patients include those with:
- Plasma cholesterol levels greater than 200 mg/dl or less than 120 mg/dl
- Plasma LDL-C levels greater than 130 mg/dl or less than 70 mg/dl
- Plasma HDL-C levels greater than 70 mg/dl or less than 25 mg/dl
- Unusual cholesterol deposits or xanthomas (nodules of lipid deposits on the skin)
Children under 2 years of age are excluded from the study.
Participants will undergo some or all of the following procedures:
- Plasma evaluation. Apolipoproteins (plasma proteins involved in metabolism of cholesterol, triglycerides, phospholipids, and proteins in the blood) and enzymes involved in lipid metabolism are measured.
- Fat biopsy. A small sample of fat tissue is collected for examination. For this test, an area on the buttock or abdominal wall is numbed. A needle is inserted into the fat, and a small amount of tissue is sucked out by a syringe.
- Leukapheresis. White blood cells are collected to help diagnose the lipid disorder. For this test, blood is collected through a needle in an arm vein, similar to donating blood. The blood circulates through a machine that separates it into its components, and the white cells are removed. The rest of the blood is returned to the body, either through the same needle or through another needle in the other arm.
- Skin biopsy. Skin cells are collected for study. The cells are grown in the laboratory and the amount of cholesterol that enters or leaves the cells is measured, providing information on abnormalities in cholesterol transport. For this test, an area of skin is numbed with an anesthetic and a small circular area is removed, using a skin punch instrument similar to a sharp cookie cutter.
- Heparin infusion study. Heparin, a blood thinner, releases enzymes that break down fat in the blood. Lipase activity (breakdown of fats) in the blood is measured following the injection of heparin into a vein.
Study Overview
Status
Conditions
Detailed Description
Study Type
Enrollment (Estimated)
Contacts and Locations
Study Contact
- Name: Robert D Shamburek, M.D.
- Phone Number: (301) 496-3460
- Email: bobs@mail.nih.gov
Study Locations
-
-
Maryland
-
Bethesda, Maryland, United States, 20892
- Recruiting
- National Institutes of Health Clinical Center
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Sampling Method
Study Population
Description
- INCLUSION CRITERIA:
- Children >= 2 years of age and >12 kg and adults
- Dyslipidemia subjects of interest the group
The following is a representative list of the types of patient presentations with dyslipidemia and potential diagnoses eligible for this protocol:
- Plasma cholesterol levels >200 mg/dl or <120 mg/dl includes patients with diagnoses such as familial hypercholesterolemia, familial combined hyperlipidemia, sitosterolemia, lipoprotein lipase, hepatic lipase or apo-CII deficiency, and dysbetalipoproteinemia.
- Plasma LDL-C levels >130 mg/dl or <70 mg/dl includes patients with diagnoses such as familial hypercholesterolemia, PCSK9, apo3500, familial combined hyperlipidemia, sitosterolemia, dysbetalipoproteinemia, abetalipoproteinemia and hypobetalipoproteinemia.
- Plasma HDL-C levels >70 mg/dl or <25 mg/dl includes patients with deficiency of cholesteryl ester transfer protein, lecithin cholesterol acyltransferase, phospholipid transfer protein, lipoprotein lipase, hepatic lipase, or apo-CII, ANGPTL3, and Tangier disease.
- Plasma triglyceride levels >150 mg/dl includes patients with deficiency of lipoprotein lipase, hepatic lipase or apoC-II, GPIHBP1, LMF1, dysbetalipoproteinemia, Type I, Type IV and Type V hyperlipidemia.
Study Plan
How is the study designed?
Design Details
- Observational Models: Case-Only
- Time Perspectives: Prospective
Cohorts and Interventions
Group / Cohort |
---|
Dyslipidemia
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
permit a full evaluation of the lipoproteins, apolipoproteins, and cellular enzymes and receptors relevant to lipoprotein metabolism in order to accurately diagnose and treat patients with potential genetic defects in these processes
Time Frame: 25 years
|
Evaluate Lipids
|
25 years
|
Collaborators and Investigators
Investigators
- Principal Investigator: Robert D Shamburek, M.D., National Heart, Lung, and Blood Institute (NHLBI)
Publications and helpful links
General Publications
- Iverius PH, Ostlund-Lindqvist AM. Preparation, characterization, and measurement of lipoprotein lipase. Methods Enzymol. 1986;129:691-704. doi: 10.1016/0076-6879(86)29099-0. No abstract available.
- Santamarina-Fojo S, Brewer HB Jr. The familial hyperchylomicronemia syndrome. New insights into underlying genetic defects. JAMA. 1991 Feb 20;265(7):904-8. No abstract available.
- Chait A, Iverius PH, Brunzell JD. Lipoprotein lipase secretion by human monocyte-derived macrophages. J Clin Invest. 1982 Feb;69(2):490-3. doi: 10.1172/jci110473.
Helpful Links
Study record dates
Study Major Dates
Study Start (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimated)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- 030280
- 03-H-0280
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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