Afro-American Heart Disease Detection Better With CT Angiography

by Tanya Thomas on  June 30, 2011 at 7:25 PM Heart Disease News
RSS Email Print This Page Comment bookmark
Font : A-A+

Researchers may have nailed one reason that African Americans are at increased risk for heart attacks and other cardiovascular events.
 Afro-American Heart Disease Detection Better With CT Angiography
Afro-American Heart Disease Detection Better With CT Angiography

According to a new study published online in the journal Radiology, African Americans have increased levels of non-calcified plaque, which consists of buildups of soft deposits deep in the walls of the arteries that are not detected by some cardiac tests. Non-calcified plaque is more vulnerable to rupturing and causing a blood clot, which could lead to a heart attack or other cardiovascular event.

According to the U.S. Department of Health and Human Services, African American adults are more likely to be diagnosed with coronary heart disease and are at greater risk of death from heart disease than white adults. In 2007, African American men were 30 percent more likely than non-Hispanic white men to die from heart disease.

"For a long time, physicians have searched for explanations as to why African Americans have higher rates of heart disease and higher cardiac death rates, but less coronary artery calcium than Caucasians," said U. Joseph Schoepf, M.D., professor of radiology and medicine and director of cardiovascular imaging at Medical University of South Carolina in Charleston. "We show that one possible explanation for the discrepancy may be found in the higher rate of less stable, non-calcified plaque in the heart vessels of African Americans."

Calcium scoring with CT is a common screening tool for patients at risk for cardiovascular disease, because increased levels of calcified plaque in the coronary arteries generally correlates with a greater risk of heart attack or other cardiovascular event. However, calcium scoring does not detect non-calcified plaque.

For the study, researchers compared 301 patients who underwent both calcium scoring with CT and contrast-enhanced coronary CT angiography (cCTA). cCTA provides a more comprehensive picture of the arteries, including the presence of non-calcified and mixed plaques.

The study group comprised 50 percent each of African American and white patients, 33 percent of whom were male (mean age 55).

Calcium scoring revealed that calcified plaque was much more prevalent in the coronary arteries of white patients than in the African Americans (45 percent, versus 26 percent). The cCTA revealed that, compared with the white patients, many more African American patients had non-calcified plaque (64 percent, versus 41 percent), and in greater amounts. The median volume of non-calcified plaque among the African American patients was 2.2 milliliters (mL), compared with 1.4 mL among white patients.

Based on these results, the researchers suggest that the value of calcium scoring as a screening tool for African Americans should be reexamined.

"The results of coronary artery calcium scoring studies are to be treated with caution in African Americans, because they may not reflect the true extent of cardiovascular disease," Dr. Schoepf said.

While cCTA does expose patients to ionizing radiation, according to Dr. Schoepf, the effective dose of this procedure has been considerably reduced over the past few years, making it a viable screening option, if other prerequisites of a successful screening test are also met.

"For African American patients, coronary CT angiography may be a more appropriate screening tool for cardiovascular risk," he said.



Source: Eurekalert

Post a Comment

Comments should be on the topic and should not be abusive. The editorial team reserves the right to review and moderate the comments posted on the site.
Notify me when reply is posted
I agree to the terms and conditions
shyamal54

What is CT NGO? How it is performed on a patient? Is there any thing to penetrate through body up the Heart to visualise inner status?

Related Links

More News on:

Cardiac Catheterization Heart Attack Air travel: To fly or not to fly Diet Lifestyle and Heart Disease Body Mass Index Silent Killer Diseases Heart Healthy Heart Lifestyle Paths to Prevent Heart Disease Statins 

News A - Z

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

News Search

Medindia Newsletters

Subscribe to our Free Newsletters!

Terms & Conditions and Privacy Policy.

Find a Doctor

Stay Connected

  • Available on the Android Market
  • Available on the App Store

News Category

News Archive

Loading...