Summary
Different chemical traces are left in the bloodstream after an asthma attack, depending on whether the cause of the attack was viral or an allergic reaction.
Original source:
http://my.webmd.com/content/article/110/109530.htm
Details
- A chemical messenger in the blood can tell doctors whether the cause of an asthma attack is a virus or an allergy.
- The finding may one day lead to a new treatment for most severe asthma attacks.
- An asthma attack associated with a viral respiratory infection can begin rapidly and be quite severe.
- The study found that virus infections are behind nearly 80% of severe asthma attacks.
- In the vast majority of cases, the culprit is the common cold virus, which typically shows symptoms such as fever, cough, and upper airway symptoms such as nasal congestion.
- Peter G. Gibson, MBBS, of John Hunter Hospital in New Lambton, Australia, and colleagues report the findings in the August issue of the American Journal of Respiratory and Critical Care Medicine.
- "In virus-induced asthma there are different mechanisms operating than those described in allergen-induced asthma," Gibson and colleagues write.
- They compared them to 15 people with virus infections but no asthma and to 16 healthy people without asthma or virus infections.
- The immune-system cells involved in virus-induced asthma, they confirmed, are different from those involved in allergy-induced asthma.
- That helps explain why drugs that usually help control allergic asthma don't work as well for allergy triggered by viral infections.
- It's not always easy to tell what is causing a severe asthma attack.
- Gibson's team found that virus-induced asthma triggers the release of a specific chemical messenger called interleukin 10 or IL-10.
- In an editorial accompanying the Gibson study, University of Wisconsin researchers William W. Busse, MD, and James E. Gern, MD, call the findings "a major step forward."
- * How does virus-induced asthma cause difficult-to-treat airway blockage?
- If IL-10 is the culprit, it may be possible to block its asthma-triggering effects.
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