槐定碱对正常大鼠心脏功能的影响

正常大鼠静脉注射槐定碱(Sophoridine Sri,20mg/kg)1min后,左心室内压力变化速率最大值(±dP/dt_(max)),左室内压力峰值(LVSP),动脉压均值及左室O负荷时收缩成份最大速度(V_(max))分别增加19.5%,13.1％,14.8%和28.2％,持续5～7min上述指标与给药前及生理盐水对照组比较,差异显著。心率(HR)减慢,但无统计学差异。肾上腺素(0.16μg/kg,iv)对±LVdP/dt_(max)和V_(max)的影响除iv后0.5min外,与Sri比较无统计学差异,作用比Sri短暂。Sri iv后1～3min内,由于MAP升高,因此心肌耗氧指数(MVO_2I)亦增高,但明显低于肾上腺素组。本研究结果表明:Sri增强心肌收缩力作用较肾上腺素持久,且不加快心率,而升高动脉压和MVO_2I的作用明显低于肾上腺素。

THE EFFECT OF SOPHORIDINE ON THE MYOCARDIAL FUNCTIONS OF NORMAL RAT HEARTS IN VIVO

The LVdP/dtmax, LVSP, AP and Vmax of the rat hearts in vivo were increased by Sophoridine ( 2 mg/kg, given to rats iv ) by 19.5, 13.1, 14.8 and 28.2% respectively. Such a positive inotropic effect lasted for more than 5 min and was statistically significant. Adrenaline (0.16 μg/kg, iv ) could also increase the LVdP/dtmax and Vmax of the heart obviously and this action was not stronger than Sri after uses of drugs except at 0.5 min and vanished more quickly. There was an increment of MVO2I because of the increased arterial pressure within 3 min after use of Sri, which was much less than adrenaline. The present results show Sri strengthened the cardial force for longer time and affected the arterial pressure and MVO2I less than adrenaline in the rat hearts in vivo.