Asthma is a common problem in children — nearly 10% now have it — and the number is increasing. Researchers are not sure of the reasons for this steady increase, but decreased air quality, lower activity levels among children, and an increase childhood obesity have all been implicated. Whatever the cause, it means that millions of American children take medicine for asthma. A significant number of these children end up in the PICU for a severe asthma attack.
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