银杏叶提取物对异丙肾上腺素致大鼠心肌损伤的保护作用

目的:研究银杏叶提取物对异丙肾上腺素致大鼠心肌损伤的保护作用.方法:异丙肾上腺素(4 mg·kg~(-1)·d~(-1),10 d,sc)制备大鼠心肌损伤模型并以银杏叶提取物(100 mg·kg~(-1)·d~(-1),13 d,ig)或倍他乐克(10 mg·kg~(-1)·d~(-1),13 d,ig)进行治疗,记录大鼠体重和左心室重,计算心室重指数,测定血流动力学及心肌酶谱AST,LDH,CK,HBDH,CKMB等指标.结果:模型组体重增长速度显著放缓(P＜0.01),心室重指数显著升高(P＜0.05),血流动力学指标显示大鼠心功能显著下降(P＜0.01,P＜0.05),心肌酶谱含量显著升高(P＜0.01,P＜0.05).与模型组比,银杏叶提取物组体重增长速度变大,心室重指数明显下降(P＜0.05),血清中心肌酶谱含量明显下降(P＜0.05),血流动力学指标明显恢复(P＜0.05),与倍他乐克组无显著差异.结论:银杏叶提取物对异丙肾上腺素引起的大鼠心肌损伤有保护作用.

Effects of Ginkgo biloba extract (EGb) on acute myocardial ischemia induced by isoproterenol in rats

Objective: To investigate the therapeutic effects of Ginkgo biloba extract (EGb) in rats with acute myocardial injury induced by isoproterenol (ISO).  Method: The rats, induced by Isoproterenol (4 mg·kg-1·d-1, 10 d, sc), were divided into groups: sham, model, metoprolol (10 mg·kg-1·d-1, 13 d, ig), EGb (100 mg·kg-1·d-1, 13 d, ig).  Result: The cardiac parameters of the Model group were compromised significantly in both systolic and diastolic function. Improvement in cardiac function by EGb was significant. In model groups, plasma activities of AST, LDH, CK, HBDH, CKMB and ventricular weight index (LV and RV/BW) were elevated significantly. With the treatment with EGb and metoprolol, the enzymes and ventricular weight index were significantly ameliorated.  Conclusion: G. biloba extract was beneficial to cardiac performance by improving myocardium enzymes and cardiac function in isoproterenol induced myocardial injury in rats.