Baby Aspirin Safer for Preventing Heart Attack
Higher-Dose Aspirin Increases Risk of Serious Bleeding, Researchers Say
WebMD News Archive
March 10, 2005 (Orlando, Fla.) - Taking aspirin is one of the best ways to prevent a heart attack. But new research shows that baby aspirin is safer.
Victor L. Serebruany, MD, PhD, a medical researcher at HeartDrug Research in Towson, Md., says, "it's not rocket science -- lower is safer."
Aspirin helps prevent heart attacks by stopping the formation of clots that block blood flow to the heart. Aspirin is used to prevent a first heart attack in people with heart disease risk factors, such as diabetes and high cholesterol. It's also taken to prevent a second heart attack.
But this "blood-thinning" effect sets aspirin therapy up for some potentially serious side effects.
Serious Bleeding 5 Times More Common
The new study shows that taking more than 100 mg of aspirin a day increases the risk of bleeding -- from nose bleeds to bleeding in the brain.
For example, Serebruany says serious bleeding -- like bleeding in the brain or in the stomach -- occurs in just more than 1% of heart disease patients taking a baby aspirin (80 mg of aspirin). But serious bleeding occurs in 5% of heart disease patients taking 200 mg or more of aspirin daily.
When all bleeding was considered -- including minor instances, such as nosebleeds -- 100 to 200 mg of daily aspirin led to bleeding in 11% of patients. Bleeding occurred in just more than 3% of patients taking a baby aspirin.
Serebruany says his study does not address how well different doses of aspirin prevent heart attacks. "I think it is very probable that low-dose aspirin is as effective as higher doses to prevent second heart attacks."
Heart Specialists Disagree on Aspirin Dose
Serebruany says he decided to investigate the relationship between aspirin dose and bleeding risk because there was a difference of opinion among heart specialists. "Cardiologists all like aspirin, but they disagree about how much aspirin should be used."
He analyzed data from 31 published studies that included information from 200,000 heart disease patients. All the patients were on daily aspirin therapy at doses ranging from 30 mg daily to 1,300 mg daily.