Navigation Links
Even with medication, asthma patients show chronic airflow changes in lungs
Date:2/2/2009

OAK BROOK, Ill. Using a special MRI technique, researchers have determined that the location and degree of airway narrowing in the lungs of asthma sufferers can be markedly persistent over time. The findings will be published in the February issue of Radiology.

"A considerable number of airways appeared to be consistently narrowed over time," said the study's lead author, Eduard E. de Lange, M.D., professor of radiology at the University of Virginia Health Sciences Center. "This finding was irrespective of disease severity or the use of medication."

Asthma is a chronic inflammatory disorder in which the small and medium-sized airways of the lungs become obstructed. Narrowing or closure in the passages can be caused by swelling in the walls or changes in the structure of the airways as a result of the chronic condition.

For the study, researchers used hyperpolarized helium 3 (3He) MRI to visualize areas of airflow obstruction in the lungs called ventilation defects. To perform the imaging test, patients inhaled the helium gas prior to undergoing MRI.

In order to measure the changes in the location and size of airway defects over time, researchers performed consecutive 3He MRI studies on 43 asthma patients between 18 and 40 years old.

Twenty-six patients underwent two imaging studies on the same day (up to 82 minutes apart), and 17 underwent 3He MRI on three occasions separated by an average of 51 days. In addition to each 3He MRI exam, patients also underwent spirometry, a test that measures the amount of air exhaled from the lungs.

In the same-day examinations, 75 percent of the lung defects identified by 3He MRI remained in the same location for both imaging studies. The majority of those defects, or 71 percent, remained the same size. In the multi-day examinations, 67 percent of defects were still present in studies that were repeated with a median interval of 31 days; in studies with a median interval of 85 days, 38 percent of defects remained in the same location. The findings were not affected by disease severity or by use of asthma medication.

"Most of the change in overall defect number was caused by variability between patients rather than within patients, indicating that 3He MRI provides a reliable means for visualizing airflow impediment within the lungs of patients with asthma," Dr. de Lange said.

After an interval of about three months, repeat 3He MRI revealed that more than one-third of airway defects were in the same location and approximately one-half of those defects were the same size.

"A considerable number of airways appeared to be consistently narrowed over time, which helps us understand that asthma is largely a focal disease of the lung," Dr. de Lange said.


'/>"/>

Contact: Linda Brooks
lbrooks@rsna.org
630-590-7762
Radiological Society of North America
Source:Eurekalert

Related medicine news :

1. Type of anesthetic will improve sleeping medication, probe mysteries of the snooze
2. St. Louis Ranked Americas Asthma Capital
3. St. Louis Named Top Asthma Capital for 2009
4. New treatment reduces severity of asthma attacks in preschoolers
5. Common Asthma Treatments Dont Work for Virus-Induced Wheeze
6. Cleaning Products Up Nurses Asthma Risk
7. FDA Finds No Link So Far Between Asthma Drugs and Suicide Risk
8. Asthma & Allergy Foundation CEO Appointed to NIH Council
9. Nitric Oxide Monitoring of Little Benefit for Kids Asthma
10. NO help: Nitric oxide monitoring does not help most children with asthma
11. American Asthma Foundation Announces Breakthrough Discovery
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/25/2016)... (PRWEB) , ... May 25, 2016 , ... ... planning services and products in the developing world, is pleased to release their ... prevent over 5 million unwanted pregnancies, almost 14,000 maternal deaths and 3.8 million ...
(Date:5/25/2016)... , ... May 25, 2016 , ... ... Clearinghouse supporting the real time adjudication of medical service claims by Pharmacy Benefit ... their current medical claims management software. The TransactRx Cross Benefit Clearinghouse receives standard ...
(Date:5/25/2016)... ... , ... The University of San Francisco (USF) has named Margaret Wooding Baker ... of more than 100 full-time faculty and staff, and serve as a member of ... , Baker comes to USF from the University of Washington in Seattle, where she ...
(Date:5/25/2016)... ... May 25, 2016 , ... Laser Skin & Wellness Center ... hands of time of female aging. The Juliet™ procedure helps to ... such as leakage, laxity, itchiness and pain have reported real relief from these and ...
(Date:5/25/2016)... ... May 25, 2016 , ... Researchers from SUNY State ... Meeting for their work on visual evoked potential and human attention. The article, ... used the Diopsys® NOVA™ ERG and VEP Vision Testing System (Diopsys, Inc., ...
Breaking Medicine News(10 mins):
(Date:5/24/2016)... 2016   , Study ... overall bowel cleansing and superiority in , ... of the ascending colon ... Norgine B.V. today announced new positive data from the ... bowel preparation) versus standard 2 litre PEG with ascorbate. The study ...
(Date:5/24/2016)... N.J. , May 24, 2016 ... oncology drug development company, today provided an update ... dose escalating clinical trial combining GEN-1, the Company,s ... the treatment of newly-diagnosed patients with advanced ovarian ... interval debulking surgery.  GEN-1 is an IL-12 DNA ...
(Date:5/24/2016)... , May 24, 2016 ... ™ , la première endoprothèse ... cathéters destinés à l,intervention portant sur les ...   OrbusNeich, entreprise mondiale spécialisée ... de changer la vie, a élargi son ...
Breaking Medicine Technology: