After treatment, the levels of the above indexes of both groups increased when compared to before and the observation group had more significant improvement. The differences were statistically significant (P<0.05) (Table III).
intravenous infusion of salbutamol aerosol combined with magnesium sulfate, 
budesonide atomization inhalation
including tidal volume (VT), ratio of time to peak [t-PTEF/t-E (%)], ratio of momentary flow rate in case of exhalation of 75% of tidal volume to peak tidal expiratory flow [TEF75/PTEF (%)] and ratio of medium term inspiration flow to medium term expiration flow (MTIF/MTEF)