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为了探讨肾上腺素β２受体激动剂舒喘灵（羟甲叔丁肾上腺素ｓａｌｂｕｔａｍｏｌ）对大鼠缺氧性肺动脉高压的作用和对肺组织β２受体ｍＲＮＡ表达的影响，以期探明当缺氧使肺β１受体已下降情况下，长期应用β２受体激动剂是否会使β２受体进一步下调以至影响防治效果，抑或仍?
In order to investigate the effect of salbutamol, an adrenergic β2 receptor agonist, on hypoxic pulmonary hypertension in rats and its effect on the expression of β2 receptor mRNA in lung tissue, Lung β1 receptor has decreased in the case of long-term use of β2-agonists will make the β2 receptor down further affect the effectiveness of prevention or control?