Featured Research

from universities, journals, and other organizations

Standards For Measuring Narrowing Of Carotid Arteries May Be Too Aggressive

Date:
June 11, 2007
Source:
University of Chicago Medical Center
Summary:
Standards for measuring the narrowing of the carotid artery using ultrasound may be too aggressive, resulting in some needless follow-up tests and procedures according to researchers. Narrowing of the carotid can be a precursor to a stroke.

Standards for the use of ultrasound as a screening tool to measure narrowing of the carotid artery may be too aggressive, resulting in some needless follow-up tests and procedures according to researchers at the University of Chicago Medical Center. Narrowing of the carotid can be a precursor to a stroke.

Hisham Bassiouny, MD, director of the non-invasive vascular lab and interim section chief of vascular surgery at the University of Chicago, presented the findings of a study today at the Society for Vascular Surgery's Annual Meeting in Baltimore.

These standards, used by the majority of vascular laboratories around the country since the early 1980s, were based on the use of angiography, a medical imaging technique in which an X-ray picture is taken to visualize the inner opening of blood filled structures.

"The limitation with angiography is that you had to guess how far the outer wall of the artery was beyond the artery's channel to determine the precise degree of artery blockage," he says. "That was a guess, an estimate. Based upon that subjective estimate, formulas were developed to look at the velocity of blood flow in the artery and determine how much narrowing existed. These formulas became the standard used to this day. However, imaging technology is much better today than when these standards were developed."

The researchers studied 74 patients with narrowing of the carotid arteries. They used ultrasound to assess the narrowing and compared the results from ultrasound to those found using CT angiography. Both techniques produced similar results, with nearly identical measures of the size of the channel inside the artery.

Further study of another 337 mild, moderate, and severely narrowed arteries, using high-resolution ultrasound techniques, looked at the diameter of the outer wall of the arteries. Standards were developed according to each individualized measurement. The results using the new standards indicated that blood flow was often better than the old standards would predict.

Previously, the researchers found that a peak systolic blood velocity of 125 centimeters per second indicated the artery was narrowed by at least 50 percent. Now, they think a peak systolic blood velocity of 155 centimeters per second indicates a 50 percent narrowing.

"As a result, we've changed the standards in our vascular lab," says Bassiouny. "We hope these new standards will be adopted everywhere. Such a move would save money and spare at least some patients from unnecessary procedures and tests."


Story Source:

The above story is based on materials provided by University of Chicago Medical Center. Note: Materials may be edited for content and length.


Cite This Page:

University of Chicago Medical Center. "Standards For Measuring Narrowing Of Carotid Arteries May Be Too Aggressive." ScienceDaily. ScienceDaily, 11 June 2007. <www.sciencedaily.com/releases/2007/06/070607112921.htm>.
University of Chicago Medical Center. (2007, June 11). Standards For Measuring Narrowing Of Carotid Arteries May Be Too Aggressive. ScienceDaily. Retrieved July 29, 2014 from www.sciencedaily.com/releases/2007/06/070607112921.htm
University of Chicago Medical Center. "Standards For Measuring Narrowing Of Carotid Arteries May Be Too Aggressive." ScienceDaily. www.sciencedaily.com/releases/2007/06/070607112921.htm (accessed July 29, 2014).

Share This




More Health & Medicine News

Tuesday, July 29, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Generics Eat Into Pfizer's Sales

Generics Eat Into Pfizer's Sales

Reuters - Business Video Online (July 29, 2014) Pfizer, the world's largest drug maker, cut full-year revenue forecasts because generics could cut into sales of its anti-arthritis drug, Celebrex. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
Nigeria Ups Ebola Stakes on 1st Death

Nigeria Ups Ebola Stakes on 1st Death

Reuters - Business Video Online (July 29, 2014) Nigerian authorities have shut and quarantined a Lagos hospital where a Liberian man died of the Ebola virus, the first recorded case of the highly-infectious disease in Africa's most populous economy. David Pollard reports Video provided by Reuters
Powered by NewsLook.com
Running 5 Minutes A Day Might Add Years To Your Life

Running 5 Minutes A Day Might Add Years To Your Life

Newsy (July 29, 2014) According to a new study, just five minutes of running or jogging a day could add years to your life. Video provided by Newsy
Powered by NewsLook.com
Ebola Outbreak Poses Little Threat To U.S.: CDC

Ebola Outbreak Poses Little Threat To U.S.: CDC

Newsy (July 29, 2014) The Ebola outbreak in West Africa poses little threat to Americans, according to officials with the Centers for Disease Control and Prevention. 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