Conclusion Sputum inflammatory cells may be a useful marker reflecting the type of airway inflammation and differing between postinfectious cough and cough variant asthma.

Conclusion IOS determine respiration impedance is a sensitive marker of judgement air velocity obstruction, it can replace FEV1 judge the degree of COPD patients airway obstruction.

Objective To explore whether the airway inflammation marker in exhaled breath condensate is increased in obstructive sleep apnea-hypopnea syndrome(OSAHS).