Wednesday, October 22, 2008

adult-onset asthma

When asthma first develop after age of 20, women are much likely to be affected then men are. In fact, 75 % of adult hospitalized for asthma treatment are women; women also remain hospitalized for asthma than do men of the same age group.
The fact women are prone to asthma suggests that female sex hormone play a role. Data from Harvard's ongoing Nurses Health Study, which has followed 121,700 female registered nurses since 1976, found that postmenopausal women who took estrogen as hormone replacement for 10 years or longer were 50 percent more likely develop asthma than were women who never used estrogen.
New research also shown that women with asthma are more likely to have a severe asthma attack immediately before or during their menstruation period. A study at Medical College of Pennsylvania found that twice as many women sought emergency asthma treatment during onset of their period or the first day of their menstruation, compared with the middle of their menstrual cycle. The fewer number of women sought treatment toward the end of their period. Some researcher believe that adult-onset attack are associated with the sharp drop in level of estradiol, a type of estrogen that occurs in the days before menstruation. another possible explanation is the biological stress associated with premenstrual syndrome
Although less common than asthma on children, Adult-onset asthma also can be triggered by allergies. between 30 and 50 percent of all adults with asthma have some allergies, but often allergic exposures don't seem to be most important driving factor.This non-allergic adult-onset is sometimes called "intrinsic". In men occupational exposure to chemical and organic dust is responsible for estimated 15 percent of asthma cases. Unfortunately,these cases may be misdiagnosed as chronic bronchitis or chronic obstructive pulmonary disease is not treated properly.

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