[Effect of ligustrazine on isolated myocardial ischemic reperfusion injury in rats]

In recent years, it is believed by some scholars that the injury of myocardial ischemic reperfusion is correlated to the thromboxane A2 (TXA2) released by platelets. In order to explore that whether the myocardial and hemangio-endothelial cells participate in the TXA2 production during the process of reperfusion, the modified Langendorff method was used to establish the model of reperfusing the isolated rat heart. On the other hand, this experiment was also intended to observe the effect of ligustrazine on the injury of myocardial ischemic reperfusion. The results revealed that the level of thromboxane B2 (metabolite of TXA2) and lactic dehydrogenase (LDH) in coronary sinus reflux fluid increased during the process of reperfusion, while the level of 6-keto-PGF1 alpha in the same fluid relatively decreased (P < 0.05). The ratio of TXB2/6-keto-PGF1 alpha was raised. The ligustrazine inhibited the release of TXB2 and LDH, but promoted the production of 6-keto-PGF1 alpha (P < 0.05). The results also proved that the myocardial and hemangio-endothelial cells could synthesize TXA2, and the amount of TXA2 released increased during the reperfusion of ischemic myocardium, which was likely to be the major factor of the injury of ischemic myocardial reperfusion. Ligustrazine plays an important role in protecting the myocardium.