赵春容,胡文星,岳志杰,张琳,赵雯,左蕾,贺建国,郑宏志,张军,余志斌.糖尿病大鼠早期左心室心肌细胞收缩舒张功能变化[J].中国医学影像技术,2014,30(2):161~166
糖尿病大鼠早期左心室心肌细胞收缩舒张功能变化
Changes of systolic and diastolic function of left ventricular cardiomyocytes in early stage of diabetic rats
投稿时间:2013-10-26  修订日期:2014-01-03
DOI:
中文关键词:  糖尿病心肌病  心室功能,左  超声心动描记术  动物实验
英文关键词:Diabetic cardiomyopathies  Ventricular function, left  Echocardiography  Animal experimentation
基金项目:国家自然科学基金(81271580)。
作者单位E-mail
赵春容 第四军医大学西京医院超声科, 陕西 西安 710032  
胡文星 第四军医大学西京医院心内科, 陕西 西安 710032  
岳志杰 第四军医大学航空航天生理学教研室, 陕西 西安 710032  
张琳 第四军医大学航空航天生理学教研室, 陕西 西安 710032  
赵雯 第四军医大学西京医院超声科, 陕西 西安 710032  
左蕾 第四军医大学西京医院超声科, 陕西 西安 710032  
贺建国 第四军医大学西京医院超声科, 陕西 西安 710032  
郑宏志 第四军医大学西京医院超声科, 陕西 西安 710032  
张军 第四军医大学西京医院超声科, 陕西 西安 710032 zhangjun@fmmu.edu.cn 
余志斌 第四军医大学航空航天生理学教研室, 陕西 西安 710032 yuzhib@fmmu.edu.cn 
摘要点击次数: 2995
全文下载次数: 1440
中文摘要:
      目的 探讨糖尿病大鼠早期病变过程中左心室心肌细胞收缩、舒张功能的变化及其与细胞超微结构、整体心脏功能变化之间的内在联系。方法 向大鼠腹腔注射链脲佐菌素建立糖尿病模型(DM组),并设立对照组(CN组)。应用超声心动图、透射电镜和可视化动缘探测系统观测两组大鼠成模起始点、2周、4周及8周时左心室整体功能和超微结构变化以及心肌细胞收缩、舒张功能改变。结果 8周时DM组较CN组左心室心腔扩大、室间隔变薄、射血分数降低(P均<0.05)。2周时DM组心肌超微结构出现轻度异常,4周和8周时DM组心肌超微结构出现明显病变。与同时间点CN组比,2周时DM组大鼠心肌细胞舒张90%时程(TR90)轻度延长(P<0.05),4周和8周时心肌细胞长度缩短,收缩幅值(PS%)与最大缩短、复长速率(±dL/dt)减低,收缩达峰时程(TPS)及TR90延长(P均<0.05)。结论 糖尿病大鼠心肌在整体功能出现异常前已发生不可逆的细胞水平损伤。
英文摘要:
      Objective To investigate changes of systolic and diastolic function that occurred in left ventricular cardiomyocytes during early stage of diabetes rats and the intrinsic links with myocardial ultrastructure and whole cardiac function in rat models. Methods Rats were randomly divided into diabetes mellitus (DM) group and control (CN) group. DM rat models were established through intraperitoneal injection of streptozotocin. Echocardiography, transmission electron microscope and video-based edge-detector system were performed respectively at the point of model establishment and 2, 4, 8 weeks later, in order to observe changes of whole cardiac function and myocardial ultrastructure, as well as changes of systolic and diastolic function of cardiomyocytes in left ventricle. Results Compared with CN group, rats in DM group showed larger left ventricular cavity and thinner interventricular septum, and decreased left ventricular ejection fraction in 8 weeks later (all P<0.05). Rats in DM group appeared myocardial ultrastructure abnormal very mildly 2 weeks and obviously 4, 8 weeks later. Compared with the same time point of CN group, time from peak to 90% relaxation (TR90) of rats in DM group slightly prolonged 2 weeks later, while reduction of cell length, peak shortening value (PS%) and maximal velocity of shortening and relengthening (±dL/dt) along with prolongation of time to peak shortening (TPS) and TR90 occurred 4 and 8 weeks later (all P<0.05). Conclusion Left ventricular cardiomyocyte of DM rats are damaged in the cellular level before whole cardiac malfunction.
查看全文  查看/发表评论  下载PDF阅读器