RÉSUMÉ
Objective To observe the effect of Yupingfeng Powder(YP) on IgE level and T lymphocyte subpopulations of CD4+ and CD8+ in cough-variant asthma patients at remission stage.Methods Seventy-four cough-variant asthma(CVA) patients at remission stage were randomized into two groups.The treatment group(N=36) received oral use of YP and the control group(N=38) received oral use of placebo,the treatment lasting 8 weeks.The changes of serum IgE level and T lymphocyte subpopulations of CD4+ and CD8+ were observed before and after treatment.Results After treatment,serum IgE level and CD4+ percentage were decreased,CD8+ percentage increased,and CD4+/CD8+ decreased in the treatment group(P0.05),but were significant between the control group and the treatment group after treatment(P