Protective effects of saponines of stem and leaf of Panax notoginseng on acute myocardial ischemia in anaesthetic dogs / 中国中药杂志

ABSTRACT

<p><b>OBJECTIVE</b>To study the protective effects of saponines of stem and leaf of Panax notoginseng (PNSSL) on acute myocardial ischemia in anaesthetic dogs.</p><p><b>METHOD</b>The acute ischemia models were made by ligation of left anterior descending (LAD) artery. The myocardial blood flow (MBF) was determined by ultrasonic doppler. The experiments adopted epicardiogram mapping to measure the scope and degree of myocardial ischemia, quantitative histologic assay (nitroblue tetrazolium, N-BT stain) to determine the size of myocardial infarction. And the endothelin (ET) and thromboxane B2 (TXB2) were measured by radioimmunological assay.</p><p><b>RESULT</b>PNSSL was showed to obviously alleviate the degree of myocardial ischemia (sigma-ST) and narrow the ischemic area indicated by N-BT staining. In addition, PNSSL could increase the MBF of ischemia section. And the treatment could inhibit the ET and TXB2 release induced by ischemia and infarction.</p><p><b>CONCLUSION</b>PNSSL demonstrated to attenuate the damage subjected to myocardial ischemia and infarction, which may be due to its function of inhibiting the ET and TXA2 release, increasing the MBF, and then improving the damaged cardiac function.</p>