Causes and Natural History of Dyslipidemias
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|ClinicalTrials.gov Identifier: NCT00353782|
Recruitment Status : Recruiting
First Posted : July 19, 2006
Last Update Posted : January 23, 2023
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.
|Condition or disease|
|Study Type :||Observational|
|Estimated Enrollment :||2000 participants|
|Official Title:||Disease Pathogenesis and Natural History of Lipid Disorders|
|Actual Study Start Date :||October 14, 2003|
- 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
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00353782
|Contact: Robert D Shamburek, M.D.||(301) firstname.lastname@example.org|
|United States, Maryland|
|National Institutes of Health Clinical Center||Recruiting|
|Bethesda, Maryland, United States, 20892|
|Principal Investigator:||Robert D Shamburek, M.D.||National Heart, Lung, and Blood Institute (NHLBI)|