Further studies are needed to determine what should be done to reduce the blood clotting risks in African-Americans, Waksman said. Possible genetic differences in the way African-Americans' bodies react to the anti-clotting medication clopidogrel may have an impact.

Clopidogrel, a common drug prescribed post-stent implantation, carries a black box warning on its label from the Food and Drug Administration because the drug loses its ability to keep blood clots from forming in some patients whose bodies have trouble converting clopidogrel to its active form.

In some studies, researchers found that this genetic difference occurs more often in African-Americans than in white patients. Blood tests or genetic testing determine if someone is a "poor metabolizer" of clopidogrel.

More African-American participants are needed in key clinical trials to determine if the treatment works before a drug is on the market, Waksman said. "We are committed to further exploring these disparities and how African-Americans can benefit from drug-eluting stents without increasing the risk of stent thrombosis."  

SOURCE American Heart Association