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目前认为是;1.异丙肾上腺素是通过兴奋支气管平滑肌的β受体,以提高平滑肌细胞内环磷酸腺苷的含量,使支气管扩张,缓解哮喘症状。现已证明,哮喘病人支气管平滑肌的β受体数目减少,α受体及M 受体功能亢进,这不是哮喘的继发反应,而是哮喘的发病原因之一。哮喘病人β受体数目减少是异丙肾上腺素难以发挥扩张支气管作用,疗效不佳的主要原因之一。2.在受体激动剂和拮抗剂存在的情况下,可使受体数目发生调节变化,一般来说,
Is currently considered to be; 1. Isoproterenol is through the excitement of bronchial smooth muscle β receptors, in order to improve the smooth muscle cells within the cyclic adenosine monophosphate content, bronchiectasis, relieve asthma symptoms. It has been shown that asthmatic bronchial smooth muscle decreased the number of beta receptors, alpha receptors and M receptor hyperthyroidism, this is not a secondary reaction of asthma, but asthma one of the causes. Reduced number of beta receptors in asthma patients is one of the main reasons why isoproterenol is difficult to play the role of expansion of the bronchus, poor response. 2. In the case of receptor agonists and antagonists, the number of receptors can make regulatory changes, in general,