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二维应变超声心动图评价移植心脏左心室收缩功能 总被引:4,自引:0,他引:4
目的应用二维应变超声心动图检测移植心脏左室壁峰值收缩应变,探讨二维应变超声心动图评价移植心脏左室收缩功能的价值。方法9例心脏移植受者共进行41次超声检查;23例正常人作为对照。记录心尖长轴观、心尖两腔观及心尖四腔观的高帧频二维图像,应用二维应变分析软件测量左室壁各节段的峰值收缩应变及心尖各切面观心肌总的峰值收缩应变、左室整体平均峰值收缩应变。结果无排异反应的心脏移植受者与正常人相比,除了4个心尖节段(后壁心尖段、前间隔心尖段、侧壁心尖段、前壁心尖段)外,左室壁各节段峰值收缩应变均显著降低(P〈0.05);心尖各切面观心肌总的峰值收缩应变及左室整体平均峰值收缩应变均较正常显著降低(P〈0.05)。急性排异反应与无排异反应的心脏移植受者后室间隔及侧壁各节段相比,峰值收缩应变均有下降趋势,但仅后室间隔心尖段峰值收缩应变降低具有统计学意义(P〈0.05)。急性排异反应的心脏移植受者心尖四腔观心肌总的峰值收缩应变较无排异反应的心脏移植受者则显著降低(P〈0.05)。结论二维应变超声心动图可用于快速准确评价移植心脏左室收缩功能,在排异反应诊断方面具有潜在价值。 相似文献
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我国每年约有150万肾脏疾病患者进展到尿毒症期,但每年能接受传统来源供器官行移植者不足1万例,巨大的供器官短缺问题使人们开始考虑推行活体供肾移植的可能性.部分移植中心在这方面做了有益的尝试,特别是武汉同济医院2006年亲属肾移植百余例,占全年肾移植的40%,这个比例接近美国等发达国家水平,同时,在供者安全性方面尚未见手术死亡的报道. 相似文献
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Recent data suggest that activation of aryl hydrocarbon receptor (AhR) by its high-affinity ligand 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) results in expansion of regulatory T (Treg) cells and suppresses the development of autoimmune and allergic diseases in several models. Treg cells have been increasingly documented to suppress allograft rejection and even to establish stable long-term graft acceptance. However, the involvement of TCDD in the regulation of solid organ transplantation rejection is largely unknown. Here, we examined whether activation of AhR with TCDD altered cardiac allograft rejection in an allogeneic heart transplant model. Recipient C57BL/6 (H-2b) mice were adminis-trated with a single intraperitoneal injection of TCDD, and the murine cardiac transplant models from BALB/c (H-2d) to C57BL/6 (H-2b) were built 24 h later. The complete cessation of cardiac contractility was defined as the observation endpoint. The effect of TCDD on T-cell proliferation was assessed by mixed lymphocyte reaction (MLR). Histological and immunohistochemical analyses were performed to estimate the severity of rejection. The phenotype and cytokine profile of lymphocytes were analyzed by flow cytometry and enzyme-linked immunosorbent assay (ELISA). Activation of AhR remarkably prolonged the survival of cardiac allografts to more than 20 days. In vitro, TCDD ugregulated the frequency of CD4+CD25+Foxp3+ Treg cells and suppressed the proliferation of T lymphocytes. In vivo, the prolonged survival time was associated with increased number of Treg cells in allografts and spleens. Furthermore, the secretion of interferon-γ (IFN-γ) and interleukin-17 (IL-17) was reduced to less than 50% of that of the PBS treatment control group by TCDD treatment, whereas IL-10 was elevated to 10-fold of that of the PBS treatment control group. Collectively, our data indicate that activation of AhR with a single dose of TCDD significantly prolonged the survival of fully allogeneic cardiac grafts, and the mechanism underlying this effect might be involved in the induction of Treg cells. 相似文献
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目的 检测激活的T_H1类淋巴细胞标记分子"T淋巴细胞免疫球蛋白域及粘蛋白域蛋白-3(Tim-3)"在受者体内不同部位T淋巴细胞上表达的变化,探讨其与急性排斥反应的关系.方法 建立小鼠同基因和异基因心脏移植模型(简称:同基因组和异基因组);移植术后第3和第6天,分离和制备两组受者外周血、脾脏、引流淋巴结和移植心内淋巴细胞悬液,采用流式细胞仪检测Tim-3阳性细胞在CD4~+ 和CD8~+ T淋细胞中的比值.结果 两组受者术后外周血和脾脏内Tim-3~+/CD4~+以及Tim-3~+/CD8~+ 的比值比较,差异均无统计学意义(P>O.05).与同基因组比较,异基因组引流淋巴结内Tim-3~+/CD4~+ 比值轻度升高(P<0.05);但异基因组术后第6天与第3天比较,差异无统计学意义(P>0.05).与同基因组比较,移植心内Tim-3~+/CD4~+和TiM-3~+/CD8~+比值均显著升高(P<0.01);异基因组术后第6天与第3天比较.移植心TiM-3~+/CD4~+和Tim-3~+/CD8~+比值也显著升高(P<0.01).结论 小鼠异基因心脏移植受者引流淋巴结和移植心内T淋巴细胞上Tim-3的表达升高与急性排斥反应的进展动态相关. 相似文献
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对本院产科1995年12月~1996年11月分娩的203例宫内窒息新生儿进行了头颅B超筛查,共检测出颅内出血40例,将临床资料及B超扫描结果分析如下。 相似文献
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目的 建立CD4 CD2 5 T细胞的免疫磁性分离(MACS)方法,并检测其体外免疫抑制功能。方法 分离C5 7BL 6小鼠和Balb c小鼠脾脏细胞后运用MACS法分离CD4 CD2 5 T淋巴细胞,用台盼蓝染色法和流式细胞法检测选出细胞的活性和纯度,用淋巴细胞转化实验分析其免疫抑制功能。结果 MACS分选法分选出的CD4 CD2 5 T细胞活性>97% ,纯度>95 % ;此方法获得的CD4 CD2 5 T细胞在体外不增殖,经丝裂原活化后可以抑制同品系小鼠和异品系小鼠的CD4 CD2 5 -T细胞增殖,这种抑制作用具有剂量依赖性。结论 MACS法可简单迅速分选出高纯度无菌CD4 CD2 5 T细胞,且不影响细胞活力。CD4 CD2 5 T调节性细胞在体外具有免疫无能和免疫抑制作用;丝裂原活化的该细胞免疫抑制功能具有剂量依赖性,但不具有抗原特异性。 相似文献
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