The differentiation of viable from nonviable myocardium has important clinical implications for patient managementand prognosis because patients with different degrees of myocardial injury may require different therap...
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The differentiation of viable from nonviable myocardium has important clinical implications for patient managementand prognosis because patients with different degrees of myocardial injury may require different therapeutic managementand have different prognosis. Thus, methods that can accurately assess myocardial viability and further quantify the extentof infarct myocardium are still needed clinically.
目的:为了研究心肌缺血再灌时内皮细胞功能紊乱与心肌细胞凋亡的关系,探讨能否通过保护内皮来减少心肌细胞凋亡以减轻缺血再灌注损伤。方法:实验选用雄性Wistar大鼠56只,随机分为假手术对照组(control,C),缺血再灌注30min(ischemia-reperfusion,I/RⅠ),90min(I/RⅡ),180min(I/RⅢ)和卡托普利干预缺血再灌30min(captopril,CPTⅠ),90min(CPTⅡ),180min(CPTⅢ)组,每组8只。采用结扎左冠状动脉前降支(LAD)30min再灌注不同时间复制心肌缺血再灌注模型。卡托普利干预组于缺血前经舌下静脉注入卡托普利针剂(0.25mg/kg)。再灌注结束后,从腹主动脉取血,分离血清,采用Percoll密度梯度离心法分离循环内皮细胞(CEC)并计数、紫外分光光度计检测血清一氧化氮(NO)含量、放射免疫法检测血清内皮素(ET)值。各组取出大鼠心脏,切取左心室前壁缺血区组织标本,常规固定、脱水、透明、包埋、切片,采用末端脱氧核苷酸转移酶(terminal deoxynucleotidyltransferase,TdT)介导的dUTP-生物素平移末端标记技术-TUNEL(TdT-mediated dUTP end labeling)标记凋亡细胞,并计算出阳
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