三草降压汤对自发性高血压大鼠降压作用的量效与时效关系研究

目的:探讨三草降压汤(SCD)降压作用的量效与时效关系特点。方法:采用清醒状态下大鼠尾动脉间接测压法,分别测定三草降压汤小、中、大三个剂量组对自发性高血压大鼠不同时间点的血压。结果:SCD给药后2h血压开始降低,小、中、大3个剂量组的降压作用效果与剂量之间呈现出较好的相关性;给药后4h,大、中剂量组具有量效相关性,而小剂量组无降压作用。选择中剂量组进一步研究表明,在给药后1h即出现血压下降,并在1-4h内保持较稳定的降压效果,6h时血压开始回升,8h后基本恢复到用药前水平。结论:SCD选择中剂量10.4g生药量/kg体质量,给药后2h作为检测点较为合适。该结果为今后更为深入的研究SCD降压药效评价和作用机制奠定了基础。

Study on Antihypertensive time-effect and dose-effect of Sancao Jiangya decoction on SHRs

Objective: To investigate the antihypertensive time-effect and dose-effect features of Sancao jiangya decoction(SCD).Methods: The blood pressure of spontaneously hypertensive rats at different time points were measured after treatment with Sancao jiangya decoction of low,middle,high concentration by tailartery blood pressure measurement for conscious rats.Results: The blood pressure was decreased at 2 hours after drug taken,there were significant dose-effect relationship between the antihypertensive effect and the low,middle,high dose.At 4h after drug taken,the high,middle dose had dose-effect correlation,but the low-dose had no antihypertensive effect.Further research on the middledose shows that the blood pressure reduced at 1h after drug taken,and the stable antihypertensive effect was keeping during 1-4h,the blood pressure began to rise at 6h,and got back to the level before drug taken at 8h.Conclusion: To choose the Middle-dose(10.4g crude drug/kg body weight) and 2h after drug taken is appropriate for SCD's use.This result laid a substantial foundation for further research on effects evaluation and mechanism of antihypertensive medicine.