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'Resistance' to low-dose aspirin therapy extremely rare
Date:12/5/2012

PHILADELPHIA Roughly one-fifth of Americans take low-dose aspirin every day for heart-healthy benefits. But, based on either urine or blood tests of how aspirin blocks the stickiness of platelets blood cells that clump together in the first stages of forming harmful clots up to one third of patients are deemed unlikely to benefit from daily use. Such patients are called "aspirin resistant." Clots are the main cause of most heart attacks and strokes.

In people who have suffered a heart attack, low-dose aspirin reduces the chances of a second event by about one fifth, making it perhaps one of the most cost-effective drugs currently prescribed. Although consumed widely by the worried well, the relative usefulness of low-dose aspirin in patients who have never had a heart attack is more controversial. According to previous primary prevention studies, low-dose aspirin reduces this group's very low risk of a first attack by about the same number of serious stomach bleeds it causes.

In a study of 400 healthy volunteers published online this week in Circulation, the journal of the American Heart Association, scientists from the Perelman School of Medicine at the University of Pennsylvania, went looking for people who are truly resistant to the benefits of aspirin, such as might result from a particular genetic makeup. They failed to find one case of aspirin resistance; rather, they found "pseudoresistance," due to the coating found on most brands of aspirin, often preferred by patients for the protection it is claimed to provide the stomach. What's more, a urine biomarker of platelet stickiness was not able to find which volunteers were even pseudoresistant.

The study was led by Tilo Grosser MD, research assistant professor of Pharmacology, Susanne Fries, MD, research assistant professor of Pharmacology, and Garret FitzGerald, MD, FRS, director of the Institute for Translational Medicine and Therapeutics.

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Contact: Karen Kreeger
karen.kreeger@uphs.upenn.edu
215-349-5658
University of Pennsylvania School of Medicine
Source:Eurekalert  

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'Resistance' to low-dose aspirin therapy extremely rare
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