CHICAGO – Heart attack patients are often given overdoses of powerful blood-thinning drugs in the emergency room, increasing their risk of serious bleeding, a study found.
Of the 30,136 heart attack patients studied who were treated last year at 387 U.S. hospitals, 42 percent got excessive doses of blood thinners. Overdoses were particularly common in thin people, women, the elderly and those with kidney problems.
Those given too much of two newer blood thinners – low molecular weight heparin and drugs sometimes called “super-aspirin” – had more than a 30 percent increased chance of major bleeding than those given the recommended dose.
Most of the more than 1 million heart attack patients in the United States each year have the type of heart attack studied – relatively small but still serious, involving plaque-narrowed arteries and clots that reduce blood flow to the heart.
An estimated 117,000 episodes of bleeding occur each year in these patients, including excessive bleeding at catheter sites, from pre-existing stomach ulcers and in the brain, where it is particularly dangerous, said Duke University researcher Dr. Karen Alexander, lead author of the study in today’s Journal of the American Medical Association.
Her study suggests 15 percent of these bleeding episodes are from overdoses and may be avoidable.
“Physicians ought to take this into account,” said Dr. Steven Nissen, a Cleveland Clinic cardiologist who was not involved with the research. “These drugs are not very forgiving.”
Alexander said determining the correct dose can be tricky in an emergency, when quick treatment is essential.
Correct doses are computed according to age, gender, weight and kidney function, and sometimes require a calculator. But when faced with a patient just brought in on a stretcher, doctors frequently ask how much the person weighs, or they “eyeball it,” Alexander said.
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