Aspirin may not be strong enough to prevent clots in some heart patients

While an aspirin a day helps keep a heart attack at bay, it may need reinforcement to totally prevent blood clots among patients with chest pain, a Johns Hopkins study shows.

Researchers took blood samples from 33 patients hospitalized for chest pain at Johns Hopkins Bayview Medical Center. Eighteen patients had acute coronary syndrome, or heart-disease-related chest pain, and 15 had non-cardiac chest pain. All took aspirin at 81 to 325 milligrams per day.

The Hopkins team treated the samples with very low doses of ADP and epinephrine – medications that allow platelets, tiny disk-shaped structures within the blood, to clump together. They found that despite treatment with aspirin, platelets clotted together 5 percent to 10 percent more among the patients with heart disease than those without.

The work is to be presented Nov. 10 at the American Heart Association's 76th Scientific Sessions in Orlando, Fla.

"Even though these patients were receiving aspirin therapy, they still had very active platelets," says Marlene S. Williams, M.D., lead author of the study and assistant professor of medicine. The more the platelets clump together, the higher the chance of a clot forming, leading to a heart attack, she says.

Patients already taking daily aspirin should continue, Williams says. Her further studies will investigate the addition of other anti-clotting agents to aspirin therapy, and the study of abnormal genes that might affect platelet function.

###

The study was funded by the National Institutes of Health. Coauthors were David E. Bush, M.D., and Thomas Kickler, M.D.

Abstract #1756: Williams, M.S., "Platelet Hyperreactivity Is Present in Acute Coronary Syndromes Despite Treatment with Aspirin."

Related links:
Johns Hopkins' Division of Cardiology
http://www.hopkinsmedicine.org/cardiology/

American Heart Association - 76th Scientific Sessions
http://www.scientificsessions.org/

Johns Hopkins Medical Institutions' news releases are available on an EMBARGOED basis on EurekAlert at http://www.eurekalert.org and from the Office of Communications and Public Affairs' direct e-mail news release service. To enroll, call 410-955-4288 or send e-mail to bsimpkins@jhmi.edu.

On a POST-EMBARGOED basis find them at http://www.hopkinsmedicine.org

[ | E-mail |

Share ]

AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.