01 October 2012

Statins Reduce Risk Of Glaucoma By Eight Percent

Statins are a class of drugs used to lower and manage the cholesterol levels of the human body.

Statins lowers cholesterol by inhibiting an enzyme that controls production of cholesterol in the liver. Statin benefits those with cholesterol problems since it targets LDL (Low-density lipoproteins) cholesterol which is the "bad" type of cholesterol.

High levels of cholesterol in the body can cause the hardening of arteris called atherosclerosis. Atherosclerosis can lead to more serious conditions such as restricted blood flow to the heart, stroke, and heart attack.

Patients with cardivascular disease are often prescribed with statins. In the United States alone, there are 20 million users of statins making it the best selling pharmaceutical in history. Sales of the drug in 2011 reached a record US$ 130 Billion.

In Feb 2012, the FDA warned statin users of potential risks. They announced a change in safety labels noting that use of statins may raise levels of blood sugar and could cause memory loss. In 2010, a study showed that statins use increases risk of diabetes by 9 percent.

Despite this, doctors still believe that the benefits of statins to patients with cardiovascular conditions outweigh its risks.

National study finds reduced glaucoma risk in patients who take statins

People who take statins to reduce their risk of cardiovascular disease are less likely to be diagnosed with the most common form of glaucoma, according to a nationwide study of more than 300,000 patients. A University of Michigan School of Medicine research team, directed by Joshua Stein, MD, MS, found that the risk for glaucoma was reduced by eight percent in patients who took statins continuously for two years, compared with patients who did not take statins. The study, the largest to date on the topic, is published in the October issue of Ophthalmology, the journal of the American Academy of Ophthalmology.

Video: Overview of Statins

Dr. Stein's study was sparked by growing evidence that statin use may protect the optic nerve and retinal nerve fibers, structures that are essential to good vision and are damaged by glaucoma. His team used healthcare claims data for a diverse population of Americans aged 60 and older who took statins to control high blood levels of unhealthy fats, a condition known as hyperlipidemia, between 2001 and 2009, The researchers assessed patients' risk for open-angle glaucoma (OAG). Unlike earlier studies, their analysis adjusted for patients who also had diabetes and/or hypertension to prevent distortion of the results.

Several of the study's findings suggest that statin use may be most important before glaucoma is diagnosed, or in the early stages of the disease. Dr. Stein's research may lead to new preventive treatments that could especially benefit groups at increased risk, including African-Americans, Hispanics and those with a family history of glaucoma.

Glaucoma affects more than 2.7 million Americans age 40 and older . If untreated, glaucoma causes vision loss or blindness by damaging the eye's optic nerve. The optic nerve sends signals from the retina — a layer of light-sensitive tissue at the back of the eye — to the brain, where these signals are interpreted as the images we see. Only about half of the people who have glaucoma know it, since symptoms are rarely noticed in the early stages and vision loss is very gradual in most cases.

"Statins' apparent ability to reduce glaucoma risk may be due to several factors, including improved blood flow to the optic nerve and retinal nerve cells and enhanced outflow of the aqueous fluid, which may reduce intraocular pressure," said Dr. Stein. "While more research is needed, we hope our results may contribute to saving the sight of thousands who are predisposed to glaucoma."

Dr. Stein cautioned that the study results apply only to patients with hyperlipidemia, and that further study is needed to determine whether statins also protect patients who don't have this diagnosis or have other characteristics that differ from the study population.


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