Lewis大鼠实验性自身免疫性心肌炎模型的建立及超声评价

摘要

Objective To investigate the feasibility to establish experimental model of autoimmune myocarditis and to study the value of echocardiographic assessment of left ventricular structure and function.Methods Seventy-two male 6 weeks old Lewis rats were randomly divided into 3 groups:normal control group,negative control group and positive group.Positive group were immunized with porcine cardiac myosin at days 0,7,30.Results ①The positive group showed weight loss,increased heart weight and myocardial necrosis with inflammatory infiltration.②The development of experimental autoimmune myocarditis included acute,subacute and chronic stages.The left ventricular diameter,ventricular wall thickness,left ventricular fractional shortening and ejection fraction of positive group differed significantly from those of other two groups.Conclusions Lewis rats immunized with porcine cardiac myosin may be a desirable experimental model of experimental autoimmune myocarditis,echocardiography can evaluate changes of cardiac structure and function accurately.%目的 评价Lewis大鼠自身免疫性心肌炎模型建立及超声监测心脏结构和功能的可行性.方法 72只Lewis大鼠随机等分为正常对照组、阴性对照组和免疫组.分别于第0、7、30 d给予免疫组大鼠脚垫注射猪心肌肌凝蛋白诱导自身免疫性心肌炎的产生,同期给予阴性对照组不含猪心肌肌凝蛋白的等量溶液注射.结果 ①免疫组大鼠体质量下降,心脏质量增加,心肌病理示炎细胞浸润和心肌细胞坏死.②免疫组大鼠心脏呈现心肌炎急性期、亚急性期及扩张型心肌病的周期性演变过程;免疫组大鼠的左室腔径、左室壁厚度、左室短轴缩短率及射血分数与正常对照组及阴性对照组比较差异均有统计学意义(P＜0.05).结论 采用猪心肌肌凝蛋白诱导Lewis大鼠实验性自身免疫性心肌炎造模成功,超声心动图可以准确评价病程中心脏结构和功能的变化.