β2肾上腺素受体激动剂（简称β2受体激动剂）是目前临床上应用较广、种类较多的支气管扩张剂。尤其β2受体激动剂的吸入剂型已广泛用于支气管哮喘急性发作的治疗。但如果使用剂量过大或应用不当仍可产生许多药物副作用或不良反应。1心血管副反应虽然这类药物具有较强的选择性 β2 adrenergic receptor agonist (referred to as β2 receptor agonist) is currently widely used in clinical applications, more types of bronchodilators. In particular, inhaled forms of β2 receptor agonists have been widely used in the treatment of acute exacerbations of bronchial asthma. However, if the use of excessive doses or improper use can still produce many drug side effects or adverse reactions. 1 cardiovascular side effects Although these drugs have strong selectivity