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A sthma is an important chronic respiratory disorder in Tai-wan as well as the rest of the world. The World Health Or-ganization (WHO) estimates that 325 million people are affected by asthma worldwide. In recent years, there has been an increasing trend in the prevalence of asthma among adults in Taiwan. According to an analysis of the Taiwan National Health Insurance database, prevalence of asthma among residents old-er than 18 years has increased from 7.57% in 2000 to 10.57% in 2011. Consequently, substantial amounts of medical resources have been expended toward asthma care, and it has become a burden to society due to reduced productivity.
It has been well known that chronic airway inflammation may cause respiratory tract obstruction. It leads to wheezing, short-ness of breath, chest tightness, coughing and other respiratory presentations. The manifestations of the disease, degrees of air-way obstruction, and clinical symptoms differ among individuals.
The severity of asthma in an individual also varies over time.Severe asthma is defined as asthma that requires stage 4 or 5 treatments to prevent it from becoming"uncontrolled" or that which remains"uncontrolled"despite such treatments. Therefore,the differentiation between uncontrolled and severe asthma is relatively important.
It has been well known that chronic airway inflammation may cause respiratory tract obstruction. It leads to wheezing, short-ness of breath, chest tightness, coughing and other respiratory presentations. The manifestations of the disease, degrees of air-way obstruction, and clinical symptoms differ among individuals.
The severity of asthma in an individual also varies over time.Severe asthma is defined as asthma that requires stage 4 or 5 treatments to prevent it from becoming"uncontrolled" or that which remains"uncontrolled"despite such treatments. Therefore,the differentiation between uncontrolled and severe asthma is relatively important.
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