尼可地爾對豬心臟驟停后心肌損傷的保護作用
[Abstract]:Background: advances in resuscitation have significantly increased the recovery rate of autonomic circulation, but the incidence and mortality of cardiac arrest remain high. Cardiac dysfunction after resuscitation was the main cause of high mortality within 72 hours after cardiac arrest. Although cardiac dysfunction after resuscitation is considered to be temporary, it is associated with decreased arterial blood pressure and low cardiac output after cardiac arrest. Intervention aimed at improving cardiac dysfunction after resuscitation may benefit clinical practice. As a ATP sensitive potassium channel opener, nicorandil is a standard drug for the treatment of coronary artery disease. Both basic and clinical studies have shown that nicorandil can improve the systolic dysfunction of the heart after ischemia and reduce myocardial infarction size after coronary artery occlusion and reperfusion. However, there are few studies on the application of nicordil in cardiac arrest and resuscitation models. Aim: to investigate the protective effect of nicorandil on myocardial injury after resuscitation in porcine cardiac arrest model induced by 4min ventricular fibrillation. Methods: 20 Landrace pigs were randomly divided into two groups: sham operation group (n = 4) and resuscitation group (n = 16). In the resuscitation group, electrical stimulation was given to induce ventricular fibrillation and cardiopulmonary resuscitation was performed after 4min. The sham group was given surgery without inducing ventricular fibrillation. Sixteen Landrace pigs in the resuscitation group were successfully resuscitated and randomly divided into two groups: saline control group (n = 8) and nicorandil group (n = 8). Nicodil (150 渭 g/kg) was immediately injected via central vein in nicorandil group. Then 3 渭 g / (kg min) was given intravenously to the end of reperfusion. Saline control group was given the same dose of normal saline. Continuous monitoring of hemodynamic parameters during the experiment: heart rate, mean arterial pressure, cardiac output, dp/dtmax and-dp/dtmax. Blood samples were taken to detect troponin I and lactate levels before fibrillation and after recovery of autonomic circulation. Left ventricular ejection fraction (LVEF) was evaluated by echocardiography before fibrillation and 6 hours after spontaneous circulation recovery. Euthanasia was performed 6 hours after the recovery of autonomic circulation and myocardial tissue was taken. The histological damage of myocardium was observed by general pathology and transmission electron microscopy. Apoptotic cardiomyocytes were detected by TUNEL method. The expression of Bax,caspase-3 and Bcl-2 in myocardial tissue was detected by ELISA and, Western Blot. Results: compared with saline control group, nicorandil significantly improved hemodynamic parameters except-dp/dtmax and heart rate (P0.05) at 6 h after recovery of autonomic circulation (P0.05). Compared with the sham operation group, the level of troponin I and lactate in saline control group increased after successful resuscitation, but the level of nicorandil group decreased significantly (P0.05). Compared with the sham operation group, the concentration of ATP in the saline control group was significantly lower than that in the nicorandil group (P0.05). Compared with the saline control group, the myocardial tissue injury and the number of TUNEL positive cells decreased after resuscitation in the nicorandil group (P0.05). The expression of Bax and caspase-3 decreased and the expression of Bcl-2 increased in the myocardium of nicorandil group. The difference was statistically significant (P0.05). Conclusion: nicorandil can improve cardiac dysfunction and energy metabolism after resuscitation, alleviate myocardial tissue injury and anti-apoptosis, and thus protect myocardium from cardiac arrest.
【學(xué)位授予單位】:山東大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:R541.78
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