Navigation Links
Study Offers Clues to Why Some Don't Benefit From Asthma Drugs

By Kathleen Doheny
HealthDay Reporter

FRIDAY, Jan. 6 (HealthDay News) -- Almost half of patients with mild or moderate asthma may have a different type of disease than those with more severe symptoms, perhaps explaining why common treatments don't work well for them, new research suggests.

"We are beginning to understand that different 'flavors' of asthma probably have different molecular mechanisms," said Dr. John Fahy, director of the Airway Clinical Research Center at the University of California, San Francisco. He is the senior author of the new study, published online Friday in the American Journal of Respiratory and Critical Care Medicine.

Asthma is a chronic disease involving inflamed airways. As the airways become more swollen, the muscles around them can tighten when something triggers symptoms such as coughing, wheezing and shortness of breath.

Current anti-inflammatory treatments target a condition called eosinophilic airway inflammation, which is common in asthma. Eosinophils are a type of white blood cell that help fight off infection and play a role in the immune response.

However, the new research finds that nearly half of the 995 patients studied did not have this condition.

Fahy's team repeatedly measured these white blood cells in sputum samples of the volunteers with asthma who were enrolled in nine clinical trials.

Nearly half, or 47 percent, had no airway eosinophilia on any test of their sputum. Some had the condition intermittently and some had it on each test.

The investigators found that only 36 percent of those not taking an inhaled corticosteroid, an anti-inflammatory, had the condition, while 17 percent of those who used the inhaled steroids did.

After two weeks of giving the participants anti-inflammatories and bronchodilator therapy, Fahy found those with the airway eosinophilia responded and had better airflow. But those who didn't have the condition did not respond. The responses to the bronchodilators -- other medicines commonly used for asthma that work by helping to open the bronchial tubes -- were similar in both groups, however.

Previous studies looked at a single sample to assess whether those with asthma had the white blood cell involvement, Fahy explained, while this study looked at many over time.

"This study reinforces the idea that asthma is not a one-type disease," he said.

Even within the nearly 50 percent without the white blood cell involvement, there are probably many different subtypes, Fahy noted.

The test used was a complicated research test, Fahy pointed out, and it is not easily done in clinical practice.

Based on the study results, researchers might next work on a simpler test to determine if those with asthma have involvement of these white blood cells, he said. Eventually, the findings may help doctors better individualize asthma treatment.

The findings suggest that a sizeable group of people with mild to moderate asthma have a type of disease that is not typical, with poorly understood mechanisms, and that new treatments will be needed, Fahy concluded.

"The finding that half of these had the absence of eosinophils in the sputum was a little surprising," said Dr. Len Horovitz, a pulmonary specialist at Lenox Hill Hospital in New York City.

"It's higher than I thought," Horovitz said. The "cascade" of inflammation in asthma -- what happens to bring on the symptoms -- has been well studied, he noted. However, "we can't guarantee that our current regimen of bronchodilators plus inhaled corticosteroids is going to work, even in mild asthma," Horovitz explained.

Doctors should ask their patients with asthma if they produce a lot of sputum, Horovitz suggested. If they do, they tend to respond to the corticosteroids.

More information

To learn more about asthma, visit the American Academy of Allergy, Asthma and Immunology.

SOURCES: John V. Fahy, M.D., director, Airway Clinical Research Center, University of California, San Francisco; Len Horovitz, M.D., internist and pulmonary specialist, Lenox Hill Hospital, New York City; Jan. 6, 2012, American Journal of Respiratory and Critical Care Medicine, online

Copyright©2010 ScoutNews,LLC.
All rights reserved  

Related medicine news :

1. Mice Exposed to Smoke Helped by Blood Pressure Drug: Study
2. Global Study Finds Drug Abuse Highest in Richer Nations
3. Diabetes Care Thwarted by Unstable Health Insurance: Study
4. Moderate red wine drinking may help cut womens breast cancer risk, Cedars-Sinai study shows
5. Mental Decline Can Start at 45, Study Finds
6. Study finds statin costs 400 percent higher in US compared to UK
7. Drug Eases Gout Flare-ups in Some Patients: Study
8. Study Reveals Whos More Prone to Be a Mean Drunk
9. Kaiser Permanente study finds continuous health coverage essential for patients managing diabetes
10. Safety-First Playgrounds Linked to Bored, Inactive Kids: Study
11. U-M study shows updated rotavirus vaccine not linked to increase in bowel obstruction
Post Your Comments:
Related Image:
Study Offers Clues to Why Some Don't Benefit From Asthma Drugs
(Date:11/27/2015)... ... November 27, 2015 , ... According to an article published ... Toronto and the University of British Columbia suggested that laws requiring bicyclists to wear ... explains that part of the reason for the controversial conclusion is that, while helmets ...
(Date:11/27/2015)... (PRWEB) , ... November 27, 2015 , ... A team ... ways to treat it. Surviving Mesothelioma has just posted the findings on the ... University Hospital Zurich analyzed the cases of 136 mesothelioma patients who were treated with ...
(Date:11/27/2015)... ... November 27, 2015 , ... Lizzie’s Lice Pickers just announced a special promotion ... off of their purchase of lice treatment product. In addition, customers will receive a ... company spokesperson. “Finding lice is a sure way to ruin the holidays, so we ...
(Date:11/27/2015)... ANGELES, CA (PRWEB) , ... November 27, 2015 , ... MPWH, the No.1 Herpes-only dating ... of 30 (see Table 1-1 ). More than 3.7 billion people under the ... virus type 1 (HSV-1), according to WHO's first global estimates of HSV-1 infection . ...
(Date:11/27/2015)... ... November 27, 2015 , ... A simply groundbreaking television series, "Voices in America", ... delves into an array of issues that are presently affecting Americans. Dedicated to providing ... this show is changing the subjects consumers focus on, one episode at a time. ...
Breaking Medicine News(10 mins):
(Date:11/25/2015)... WILMINGTON, N.C. , Nov. 25, 2015 /PRNewswire/ ... announces the planned investment of at least $15.8 ... in Wilmington, NC . The ... services capacity to meet the growing demands of ... Wilmington site expansion will provide up ...
(Date:11/25/2015)... N.Y. , Nov. 25, 2015  Henry Schein, ... and services to office-based dental, medical and animal health ... (GNYDM) Meeting the Henry Schein ConnectDental® Pavilion , ... broadest array of open solutions designed to help any ... Click here for a schedule of experts ...
(Date:11/25/2015)... , Nov. 25, 2015  Trovagene, Inc. (NASDAQ: ... announced that Chief Executive Officer Antonius Schuh, Ph.D., is ... th Annual Piper Jaffray Healthcare Conference. ... New York Palace Hotel in New York ... p.m. EST. Mr. Schuh will be available for one-on-one ...
Breaking Medicine Technology: