半圆形截面血管内支架结构流阻的数值模拟实验

通过SoildWorks软件构建血液流场和8种不同结构裸支架(支架形状和通透率不同)的三维实体模型。利用计算流体力学方法,借助于有限元软件ANSYS 11.0对不同结构内支架分别置入血管后进行仿真研究。一定通透率范围内,对于半圆形截面支架模型血液从半圆面流向平面时的流阻大于反向流过时的流阻;通透率大到一定值时,结果相反。无论是网格状支架模型还是正弦状支架模型,血液从支架正反两个方向流过时的流阻大小随通透率的增加而减小;相同通透率下,血液从相同方向流过支架时,网格状支架模型的流阻比正弦状支架模型的大一些,大概在1.5倍左右。结果提示,血液从不同方向流过半圆形支架丝时的流阻存在一定的差异,这为支架结构设计提供了重要的理论指导意义。     

前后手术入路治疗胸腰段爆裂骨折的临床对比研究

目的通过经前路、后路手术治疗胸腰段爆裂骨折的临床疗效,为术式选择提供依据。方法回顾分析2005年7月—2010年7月收治的82例手术治疗的胸腰段爆裂骨折患者的临床和影像学资料,其中前入路手术42例,后入路手术40例。通过X线、CT片评估伤椎Cobb角的矫正和丢失、椎管减压范围及植骨融合情况,ASIA分级评价神经功能,并观察手术并发症。结果术后创口均一期愈合,未出现神经损伤症状加重等严重并发症。前路较后路手术组时间长、出血量多,椎管清除率及植骨融合率均高;前入路组较后入路组椎体压缩及后凸畸形程度重,二组后凸Cobb角矫正度差异无统计学意义（P〉0.05）,丢失度上差异有统计学意义（P〈0.01）;二组脊髓神经功能恢复差异无统计学意义（P〉0.05）。结论前路和后路手术治疗胸腰段爆裂骨折的临床疗效差异无统计学意义;二者各有优缺点,应根据骨折类型、伤椎椎体压缩程度、椎管内骨性占位程度以及是否伴有脊柱后柱结构不稳或骨折脱位来合理选择手术方式。     

丹黄散外敷治疗糖尿病足的临床疗效观察

目的 观察复方中药散剂丹黄散外敷治疗糖尿病足溃疡临床疗效.方法 将17例糖尿病足溃疡患者分为两组:对照组9例,常规治疗基础上予局部换药;丹黄散治疗组8例,常规治疗基础上予丹黄散局部外敷治疗.比较其创面上皮匍行情况和创面愈合情况的差异..结果 治疗后7 d、14 d、21 d丹黄散治疗组创面上皮匍行速度快于对照组,差异有...     

地塞米松对双氯芬酸钠肝损伤的保护作用

目的探讨地塞米松(dexamethasone,Dex)对双氯芬酸钠诱导的大鼠药物性肝损伤的保护作用及部分机制。方法大鼠随机分为正常对照组、模型对照组、Dex(10 mg.kg-1)给药组。Dex(10 mg.kg-1)腹腔注射,1 h后腹腔注射双氯芬酸钠100 mg.kg-1,24 h后检测ALT和AST活性、测定肝匀浆中MDA、GSH含量和GSH-Px、SOD活性,观察肝组织病理学变化,并测肝线粒体膜电位、线粒体肿胀度、NADH水平、SDH及ATPase活性。结果模型对照组血清ALT、AST升高,光镜下可见肝小叶内肝细胞片状坏死,肝匀浆MDA含量升高,GSH、GSH-Px和SOD含量降低,肝线粒体NADH含量、SDH及ATPase活性降低。Dex可明显降低ALT、AST活性(P<0.05),减轻肝脏炎症,降低肝匀浆中MDA含量(P<0.01),升高GSH含量、GSH-Px和SOD活性以及线粒体中NADH含量、SDH及ATPase活性(P<0.01)。结论 Dex对双氯芬酸钠诱导的大鼠药物性肝损伤有保护作用,作用机制可能与减轻线粒体损伤有关。     

Mesenchymal Stem Cells Display Tumor-Specific Tropism in an RCAS/Ntv-a Glioma Model

Bone marrow-derived mesenchymal stem cells (MSCs) have been shown to localize to gliomas and deliver therapeutic agents. However, the clinical translation of MSCs remains poorly defined because previous studies relied on glioma models with uncertain relevance to human disease, typically xenograft models in immunocompromised mice. To address this shortcoming, we used the RCAS/Ntv-a system, in which endogenous gliomas that recapitulate the tumor and stromal features of human gliomas develop in immunocompetent mice. MSCs were harvested from bonemarrowof Ntv-a mice and injected into the carotid artery of Ntv-a mice previously inoculated with RCAS-PDGF-B and RCAS-IGFBP2 to induce malignant gliomas (n = 9). MSCs were labeled with luciferase for in vivo bioluminescence imaging (BLI). After intra-arterial injection, BLI revealed MSCs in the right frontal lobe in seven of nine mice. At necropsy, gliomas were detected within the right frontal lobe in all these mice, correlating with the location of the MSCs. In the twomice without MSCs based on BLI, no tumor was found, indicating thatMSC localization was tumor specific. In another cohort of mice (n = 9), MSCs were labeled with SP-DiI, a fluorescent vital dye. After intra-arterial injection, fluorescence microscopy revealed SP-DiI-labeled MSCs throughout tumors 1 to 7 days after injection but not in nontumoral areas of the brain. MSCs injected intravenously did not localize to tumors (n = 12). We conclude that syngeneic MSCs are capable of homing to endogenous gliomas in immunocompetent mice. These findings support the use of MSCs as tumor-specific delivery vehicles for treating gliomas.     

Malignant characteristics of circulating tumor cells and corresponding primary tumor in a patient with esophageal squamous cell carcinoma before and after surgery

We report the malignant characteristics of circulating tumor cells (CTCs) and the corresponding molecular features of the primary tumor in a patient with esophageal squamous cell carcinoma (ESCC). A 70-year-old male patient was diagnosed with TNM stage T3N0M0 ESCC. Before surgery, seven intact CTCs and 12 CTCs with a fragmented membrane were detected in 7.5 mL of peripheral blood by immunofluorescence staining. One week after radical resection of the primary tumor, four CTCs were identified in 7.5ml peripheral blood. All CTCs were confirmed as having a malignant phenotype by chromosomal analysis and routine cell staining. Ninety percent of the CTCs were found to have polysomic chromosomes 8 and 20 by fluorescence in situ hybridization (FISH). Immunofluorescence analysis showed that all of the primary tumor cells detected were cytokeratin8/18/19 (CK8/18/19)-positive, but only 1% were CD133-positive. The serum CA19-9 and CEA level were normal in the process of diseases. The patient died 6 months after surgery as a result of lung metastases and other complications. The results of this study suggest that the dynamics and malignant characteristics of both CTCs and the corresponding primary tumor during the disease process may predict tumor burden and the risk of relapse and metastasis.