[Effects of liensinine on haemodynamics in rats and the physiologic properties of isolated rabbit atria].

Abstract

Liensinine(Lien), an alkaloid extracted from the green seed embryo of Nelumbo nucifera Gaertn, has been shown to have anti-arrhythmic action, its mechanism may be related to blockade of Ca2+, Na+ influx. Lien 3 mg/kg i.v. may temporarily inhibit all parameters of haemodynamics in anesthetized or pithed rats. The inhibitory effects on LVP, +dp/dtmax and SAP in anesthetized rats are slightly stronger than those of quinidine (Qui) 3 mg/kg. Lien 1-30 mg/kg dose-dependently produced these actions. Lien and Qui 12 mg/kg lowered LVP, +dp/dtmax and SAP by 33%, 37%, 29% and 9%, 12%, 9% respectively. While both of them inhibited the other parameters of haemodynamics with nearly equal degrees. The degrees of inhibitory effect of Lien 12 mg/kg on all haemodynamic parameters nearly corresponded to these of verapamil 1 mg/kg. Lien 1-100 mumol/L reduced the contractile force of isolated left atria and the spontaneously beating rate of isolated right atria of rabbits in concentration-dependent manner. These results indicate that the properties of the effect of Lien on haemodynamics may be similar to those of verapamil and different from those of Qui.