ACO(asthma-chronic obstructive pulmonary overlap) is a relatively new proposed clinical form of chronic airway disease. Guideline or preferring therapy for ACO is still evolving. Current clinical solution is when ACO presents like asthma, initial treatment will accord to the guideline for asthma , while it presents like COPD, COPD recommendation treatment (not alone ICS,but ICS in addition of LABA with or without LAMA) will be chosen, which are subjective. Although present guidelines has recommended that ACO should be treated with at last two inhalant, but limited date have proven it.
A random controlled trial will be conducted to evaluate the efficiency of ICS(budesonide) combined with LABA (formoterol) and LAMA(tiotropium bromide) in the treatment of acute exacerbation of ACO,compared with the control group receiving tiotropium bromide with formoterol only.
