Featured Research

from universities, journals, and other organizations

CT angiography improves detection of heart disease in African-Americans

Date:
June 28, 2011
Source:
Radiological Society of North America
Summary:
Researchers may have discovered one reason that African-Americans are at increased risk for heart attacks and other cardiovascular events. According to a new study, 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.

Researchers may have discovered one reason that African Americans are at increased risk for heart attacks and other cardiovascular events.

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.


Story Source:

The above story is based on materials provided by Radiological Society of North America. Note: Materials may be edited for content and length.


Journal Reference:

  1. Joseph Schoepf et al. Coronary Atherosclerosis in African American and White Patients with Acute Chest Pain: Characterization with Coronary CT Angiography. Radiology, 2011

Cite This Page:

Radiological Society of North America. "CT angiography improves detection of heart disease in African-Americans." ScienceDaily. ScienceDaily, 28 June 2011. <www.sciencedaily.com/releases/2011/06/110628095234.htm>.
Radiological Society of North America. (2011, June 28). CT angiography improves detection of heart disease in African-Americans. ScienceDaily. Retrieved August 29, 2014 from www.sciencedaily.com/releases/2011/06/110628095234.htm
Radiological Society of North America. "CT angiography improves detection of heart disease in African-Americans." ScienceDaily. www.sciencedaily.com/releases/2011/06/110628095234.htm (accessed August 29, 2014).

Share This




More Health & Medicine News

Friday, August 29, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Killer Amoeba Found in Louisiana Water System

Killer Amoeba Found in Louisiana Water System

AP (Aug. 28, 2014) State health officials say testing has confirmed the presence of a killer amoeba in a water system serving three St. John the Baptist Parish towns. (Aug. 28) Video provided by AP
Powered by NewsLook.com
Who Could Be Burnt by WHO's E-Cigs Move?

Who Could Be Burnt by WHO's E-Cigs Move?

Reuters - Business Video Online (Aug. 28, 2014) The World Health Organisation has called for the regulation of electronic cigarettes as both tobacco and medical products. Ciara Lee looks at the impact of the move on the tobacco industry. Video provided by Reuters
Powered by NewsLook.com
CDC Director On Ebola Outbreak: 'It's Worse Than I Feared'

CDC Director On Ebola Outbreak: 'It's Worse Than I Feared'

Newsy (Aug. 28, 2014) CDC director Tom Frieden says the Ebola outbreak is even worse than he feared. But he also said there's still hope to contain it. Video provided by Newsy
Powered by NewsLook.com
How A 'Rule Of Thumb' Could Slow Down Drinking

How A 'Rule Of Thumb' Could Slow Down Drinking

Newsy (Aug. 28, 2014) A study suggests people who follow a "rule of thumb" when pouring wine dispense less than those who don't have a particular amount in mind. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins