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Remodelling of airway smooth muscle in asthma: what sort do you have?

Background Shortening of smooth muscle around airways is the basis of symptoms and abnormal lung function in asthma. The airway wall is increased in thickness in small and large airways asthma, in relation to the clinical severity of asthma and the airway smooth muscle layer is the main contributor to this thickening. The relative contributions of more airway smooth muscle cells, bigger cells or more extracellular matrix to the increased thickness of the smooth muscle layer in asthma is not clear and has been examined in only a small number of cases, Studies of the natural history of asthma suggest that the clinical severity of asthma is relatively constant over time, deficits in lung function compared with nonasthmatic subjects occur early in the course of the disease and the decline in lung function with age is increased in asthma.