What does it mean to have elevated high-density lipoprotein (HDL)?
Jun 04, 2020
Source: Cainiu Health
Dr. Chen Xinyan
Introduction
What does elevated high-density lipoprotein (HDL) mean? In women, elevated HDL levels indicate that HDL—the primary function of which is to transport cholesterol to the liver for excretion—is higher than normal. Mildly elevated HDL levels exert a protective effect on the cardiovascular system. However, markedly elevated HDL levels may result from abnormal hepatic lipid metabolism.
High-density lipoprotein (HDL) is one of the serum proteins—a complex lipoprotein composed of lipids, proteins, and their associated regulatory factors. HDL transports cholesterol from peripheral tissues to the liver, where it is either converted into bile acids or excreted directly into the intestine via bile. Angiographic studies have demonstrated a significant negative correlation between HDL cholesterol (HDL-C) levels and the degree of arterial lumen stenosis. Thus, HDL functions as an anti-atherosclerotic plasma lipoprotein and serves as a protective factor against coronary heart disease.
What does elevated HDL mean?
In women, elevated HDL levels are generally categorized into two types: physiological and pathological. HDL’s primary function is to transport cholesterol to the liver for elimination from the body. A mild increase in HDL confers protective benefits to the cardiovascular system. However, markedly elevated HDL levels may indicate abnormal hepatic lipid metabolism.
Slightly elevated HDL levels under normal circumstances are harmless—and indeed considered favorable—because HDL facilitates cholesterol transport to the liver for excretion, thereby offering protection to both the heart and cerebral vasculature. HDL is often referred to as “good cholesterol.” Therefore, mildly elevated HDL values are not clinically concerning. Nevertheless, if HDL levels are abnormally high, repeat testing or further diagnostic evaluation is warranted to identify underlying causes and rule out organic disease.
Factors influencing HDL-C levels
1. In severe malnutrition, plasma cholesterol levels decrease markedly, and HDL-C levels also decline. Obesity is likewise commonly associated with low HDL-C.
2. Low HDL-C may occur in conditions such as diabetes mellitus, hepatitis, and cirrhosis.
3. Patients with hypertriglyceridemia frequently exhibit low HDL-C.
4. Reduced HDL-C is also observed in acute infections, diabetes mellitus, chronic renal failure, and nephrotic syndrome.
5. Moderate alcohol consumption and regular physical activity tend to raise HDL-C levels, whereas smoking lowers HDL-C.
6. Administration of estrogen, insulin, oral contraceptives, niacin, heparin, or vitamin E may elevate HDL-C; in such cases, adequate rest is usually sufficient.
7. HDL-C levels typically normalize upon discontinuation or dose reduction of the implicated medication.
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