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New review suggests caution on drugs to raise 'good' cholesterol
Date:8/14/2007

With 40 percent of all heart attacks and related cardiovascular problems occurring in people who have low levels of so-called good cholesterol, researchers have long sought medications to increase the amount of this type of cholesterol in the bodys circulation.

But a new review of 31 randomized controlled trials published in the Journal of the American Medical Association suggests that so far, only modest evidence supports the use of most medications to raise levels of high-density lipoprotein (HDL) good cholesterol. Some are even harmful.

The authors concluded that while efforts to lower low-density lipoprotein (LDL or bad cholesterol) have consistently reduced cardiovascular disease risk, HDL-based approaches are much more complex and sometimes disappointing. As a result, the primary focus should be on LDL, said review co-author Mehdi Shishehbor, D.O., of the Cleveland Clinic.

The news is that not everything that raises HDL will be beneficial, said Ronald Krauss, M.D., spokesman for the American Heart Association and director of atherosclerosis research at Children's Hospital Oakland Research Institute in California.

HDL is a much more complicated issue than LDL, said Prediman Shah, M.D., director of the Atherosclerosis Research Center at Cedars-Sinai Medical Center in Los Angeles. Its not only important how much HDL there is, but what kind it is. Quality is as important as quantity. Is the function good or is it [a form of HDL] that doesnt do the job properly"

There are many types of HDL, not all of which nurture the heart and blood vessels. The good kinds seem to carry fat out of arteries to the liver and perform functions in cell membranes and elsewhere. However, HDLs vary considerably in size, density and other chemical properties that change their ability to sustain health.

Certain kinds of HDL could even increase inflammation, clogging arteries rather than clearing them, and doctors currently do
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Contact: Lisa Esposito
hbns-editor@cfah.org
Center for the Advancement of Health
Source:Eurekalert

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