班布特罗对豚鼠支气管收缩反应的扩张作用

观察班布特罗对豚鼠支气管收缩反应的影响。方法：用哮喘发作潜伏期，肺机械功能及离体气管平滑肌松弛试验观察班布特罗的支气管扩张作用。结果：班布特罗ｉｇ后１ｈ，４ｈ和２４ｈ均能延长组胺诱导的豚鼠哮喘潜伏期，ＥＤ５０分别为０．７４，０．７５，１．００ｍｇ．ｋｇ＾－１，其作用持续时间明显长于特布他林。

Bronchodilating effects of bambuterol on bronchoconstriction in guinea pigs.

AIM: To study the effects of bambuterol (Bam) on bronchoconstriction in guinea pigs. METHODS: Bronchospasm induced by histamine aerosol, lung resistance (RL) and dynamic lung compliance (Cdyn) changes induced by ovalbumin aerosol in vivo, isolated resting lung parenchyma strips, and carbamylcholine-induced tracheal constriction in vitro in guinea pig were investigated. RESULTS: Bam dose-dependently prolonged the time to histamine-induced collapse, ED50 values (95% confidence limits) of Bam intragastric gavage (i.g.) after 1 h, 4 h, and 24 h were 0.74 (0.60-0.91), 0.75 (0.61-0.91) and 1.00 (0.77-1.30) mg.kg-1, respectively. Bam 2 or 10 mg.kg-1 i.g. 2 h before ovalbumin aerosol partly or almost completely inhibited bronchial challenge of ovalbumin-induced change of RL and Cdyn. Bam 0.1-1.0 mumol.L-1 gave a weak relaxation on isolated tracheal strips induced by carbamylcholine and failed to relax the isolated resting lung parenchyma strips in guinea pig. CONCLUSION: Bam showed a long-acting bronchodilation by its slow metabolism in vivo.