TUESDAY, Nov. 16 (HealthDay News) -- Higher doses of the blood-thinner Plavix were no better at preventing heart attacks, blood clots or death than the standard lower dose in patients who had received artery-opening stents, new research shows.
The higher dose -- double the usual amount -- was tested in patients with "high platelet reactivity," meaning they failed to respond to the drug at lower doses.
Plavix (clopidogrel) helps prevent clots from forming in patients who have low platelet reactivity and who have had stents inserted to prop open blocked arteries.
But the new study "doesn't support" physicians using the higher, 150-milligram dose of Plavix after stenting, according to study lead author Dr. Matthew Price, who presented the findings Tuesday at the annual meeting of the American Heart Association in Chicago.
So, the study leaves an important question unanswered: How to treat heart patients who don't respond well to Plavix?
"It remains uncertain to some extent," said Dr. Abhiram Prasad, an interventional cardiologist with the Mayo Clinic in Rochester, Minn. "It's an important study to have done but the key issues are that a significant proportion of the patients remained with high platelet reactivity even after being on the higher dose."
Previous, smaller studies had indicated that Plavix might have more of an effect if the dose was doubled.
"Platelet reactivity varies widely," noted Price, director of the Cardiac Catheterization Laboratory at the Scripps Clinic in La Jolla, Calif. He explained that numerous studies have shown that a high reactivity level is associated with poorer outcomes after angioplasty and/or stenting. But until now, a steep rise in the dose of Plavix "has not been tested in a large randomized clinical trial," he said.
For this trial, investigators tested a large group of patients for platelet reactivity aft
All rights reserved