以麻黄碱作比较，研究伪麻黄碱对豚鼠离体左右心房的作用。结果伪麻黄碱（１～１００μｍｏｌ／Ｌ）和麻黄碱（１～１０μｍｏｌ／Ｌ）均剂量依赖性加快离休豚鼠右心房率，增强离体豚鼠左心房收缩力，作用分别受预先给予普萘洛尔（０．１μｍｏｌ／Ｌ）和利血平化动物的显著抑制；此外，麻黄碱对左心房的作用受预先给予酚妥拉明（１０μｍｏｌ／Ｌ）抑制，而伪麻黄碱的作用均不受影响。 Ephedrine for comparison, study of pseudoephedrine on left and right atrial guinea pig atrial function. Results Pseudoephedrine (1 ~ 100μmol / L) and ephedrine (1 ~ 10μmol / L) accelerated right atria of guinea pigs in a dose-dependent manner and enhanced left atrial contractility in isolated guinea pigs. The effects were pretreated with propranolol .1μmol / L) and reserpine-deprived animals. In addition, the effect of ephedrine on the left atrium was inhibited by pretreatment with phentolamine (10μmol / L), while the effect of pseudoephedrine was not affected.