Effect of semi dose of tiotropium on lung function in severe chronic obstructive pulmonary disease / 中国医师进修杂志

ABSTRACT

Objective To evaluate the efficacy of 9 μ g tiotropium inhalation once daily in patients with moderate to severe chronic obstructive pulmonary disease(COPD).Methods One hundred seventy-one patients with moderate to severe COPD were divided into two groups by random digits table methods:86 patients in test group who used 9 μ g tiotropium powder inhaler once daily,and 85 patients in control group who used the recommended dose 18 μ g once daily,both for 6 months.Patients' pulmonary function and 6-minute walk test were measured before treatment,3 months after treatment and 6 months after treatment.Results Two groups were compared 6 months after treatment.The level of forced expiratory volume in first second(FEV1) in the control group increased an average of (0.21 ± 0.12) L,and the rising rate was (19.31 ± 10.61)％.The level of FEV1 in test group increased (0.22 ±0.13) L,and the rising rate was (19.25 ± 11.52)％.The level of forced vital capacity (FVC) in control group increased an average of (0.22 ±0.10) L,and the rising rate was (11.63 ±5.31)％.The level of FVC in test group increased (0.23 ± 0.15) L,and the rising rate was (11.62 ± 6.45)％.The distance of 6-minute walk test in control group increased an average of (29.24 ± 11.92) m after treatment for 6 months,and the rising rate was (18.30 ± 3.77)％.The distance of 6-minute walk test in test group increased an average of (29.14 ± 11.89) m,and the rising rate was (18.20 ± 3.85)％.The number of acute exacerbations and rehospitalizations in two groups at these period had no significant difference (P ＞ 0.05).As for the test group,though the number of acute exacerbations and rehospitalizations decreased,there were no significant differences (P ＞ 0.05).Conclusions The effect of inhalation therapy of 9 μ g tiotropium once daily is more or less the same with that of 18 μ g once daily.