肾上腺素能神经β-受体激动剂及甲基黄嘌呤类药物在医疗上用于扩张支气管。新近以豚鼠与兔的离体心肌试验表明,洋地黄与茶碱联用可产生有害的效应。茶碱可增强洋地黄诱发心律失常的作用,以及抑制其正性肌力效应。特布他林(间羟舒喘宁,terbutaline)本身并不诱发心律失常,但可促使洋地黄诱发心律失常。洋地黄可产生延迟性后去极化。特布他林兴奋β受体,从而触发延迟性后去极化 Adrenergic nerve beta-agonists and methylxanthines are medically used to expand the bronchus. Recent experiments with guinea pigs and rabbits in vitro showed that combination of digitalis and theophylline can have detrimental effects. Theophylline can enhance the role of digitalis induced arrhythmia, and inhibit its positive inotropic effect. Terbutaline (terbutaline) does not induce arrhythmias per se but may induce digitalis to induce arrhythmias. Digitalis produces delayed post-depolarization. Terbutaline agonizes the beta receptor, triggering delayed posterior depolarization