激光心肌血管重建术围手术期及术后早期心血管活性肽的变化

Objective: To investigate the changes of cardiovascular active peptides duringperioperation and early stage after transmyocardial laser-revascularization (TMLR). Methods: Tooperate on the chest, make 13 -- 27 channels with COZ laser (home-made machine ) on the anterior,lateral and latter parts of left ventricular wall of the heart in six patients with coronary heart diseasewho could not be treated by PTCA and CABG. The contents of atrial natriuretic peptide (ANP) .brainnatriuretic peptide(BNP)' adrenomedullin (Adm) and endothelin (ET) in pericardial fluid and bloodplasma were determined by immunoradioassay. Results: COmpared with healthy controls, the plasmalevels of ANP. BNP. Adm and ET in patients before TMLR were 11. 0 \ 22. 9. 3. 1 and 1. 3 timeshigher(p < 0. 01 ), respectively. After TMLR the contents of these four peptides in patient plasmareduced gradually. Four weeks after operation, they were 61. 0 % .58. 6 % .63. 4 % and 55. 3 % lower, respectively, than those before TMLR (P < 0. 01 ). Conclusion: TMLR apparently improved thecardiovascular endocrine function of patients with severe heart failure.     

The role of postischemic recirculation in the development of ischemic neuronal injury following complete cerebral ischemia

Summary The neuronal response to complete cerebral ischemia (CCI) of 5–15 min duration was evaluated at the light and electron microscopic level subsequent to postischemic recirculation periods of up to 60 min. Following postischemic reperfusion, the homogeneous neuronal changes characteristic of permanent CCI were modified into a heterogeneous pattern of selectively vulnerable neuronal responses. Four basic types of neuronal injury were represented within this heterogeneous neuronal population. The Type I neuronal response was most numerous and consisted of chromatin clumping, nucleolar condensation and a breakdown of polysomes. This response may represent a reversal of some of the neuronal changes observed after permanent CCI. In addition to the above changes, Type II neurons contained swollen mitochondria and Golgi saccules which appeared as microvacuoles under the light microscope. Type III neurons displayed varying degrees of neuronal shrinkage and numerous swollen mitochondria. Type IV neurons were markedly shrunken and electron-dense with few identifiable subcellular structures. The distribution of Type I neurons was random but the other neuronal responses occurred in selectively vulnerable brain regions. The number of Type II, III, and IV neurons increased with extended insult durations but were unaffected by the length of recirculation. Ten minutes of CCI represented the threshold for a significant increase in the number of severely altered neurons. These findings suggest that considerable neuronal injury may be present after 10–15 min of CCI, and the lack of a recirculation period following CCI appears to afford the brain parenchyma an extensive degree of structural protection.Supported by PHS Grant NS-12587     

Comparative study of graft flow between on-pump and off-pump coronary bypass surgery for patients with multivessel coronary artery disease

Objective： To Comparatively study grafts flow between on-pump and off-pump coronary bypass surgery for patients with triple coronary artery disease. Methods ： The grafts flow was studied in 100 patients of OPCAB and compared with 100 cases of CCABG by means of Medi-Stim Butterfly Flowmeter measurement intraoperatively. Results： The mean number of the distal anastomosis was 3.78＋ 1.11 in CCABG group, and 3.83 ＋ 0.93 in OPCAB group. The index of completeness of revascularization in CCABG group was 1.01 ＋ 0.08, and 1.10＋ 0.09 in OPCAB group. The flow of grafts was satisfied in all patients. The PI values were all under 5. There was no significant difference in the mean graft flow and PI value between two groups. Conclusion： OPCAB can provide the same grafts flow and similar completeness of revascularization when compared with CCABG which indicates the similar anastomosis quality of grafts in OPCAB and CCABG groups.     

血液环境下Biodentine与MTA的颜色稳定性研究

目的 比较牙体牙髓治疗中常用的骨水泥材料Biodentine与三氧化矿物凝聚体(mineral trioxide ag-gregrate,MTA)在与血液接触条件下的颜色稳定性,并探讨其可能的变色原因.方法 制备直径5 mm、高3 mm的Biodentine和MTA圆盘,将每种材料的24个圆盘随机分配到去离子水组和脱纤...     

经皮椎体后凸成形术治疗老年椎体后壁完整的重度骨质疏松性椎体压缩骨折的效果

目的 探讨经皮椎体后凸成形术(PKP)治疗老年椎体后壁完整的重度骨质疏松性椎体压缩骨折(OVCF)的临床效果.方法 回顾性分析2012年1月至2014年1月于本院诊治的47例(54个椎体)OVCF患者临床资料,所有患者均采用球囊扩张复位法进行PKP治疗,治疗后随访18～24个月.对比患者治疗前、后及末次随访时患椎高度、疼痛度评分(VAS)、局部Cobb角及健康调查评分(SF-36),观察临床治疗效果.结果 47例患者治疗前患椎平均高度为(8.4±1.3) mm、VAS评分为(7.9±1.8)分、局部Cobb角为(25.1±5.5)°、SF-36评分为(33.2±6.5)分;治疗后3d患椎平均高度为(12.8±1.9)mm、VAS评分为(2.3±1.1)分、局部Cobb角为(17.2±4.5)°、SF-36评分为(44.5±6.8)分;末次随访患椎平均高度为(12.3±2.1) mm、VAS评分为(2.4±1.3)分、局部Cobb角为(18.3±4.7)°、SF-36评分为(46.3±7.1)允治疗后3d及末次随访数据与治疗前比较差异均具有统计学意义(均P＜0.05),治疗后3d与末次随访数据比较差异无统计学意义(P＞0.05).结论 OVCF患者采用球囊扩张复位法行PKP治疗,安全性高,临床效果明显.     

肢体动脉急性缺血22例

目的 探讨急性肢体动脉缺血(AEI)的病因、治疗及影响其预后的因素。方法 回顾性总结22例AEI患临床处理的经验。结果 手术处理21例占95．5％；非手术处理1例，肢体挽救率100％。结论 急诊手术对绝大多数AEI的病人有效。该病预后取决于早期诊断和及时治疗，对不同情况采取不同的处理措施。总的原则是尽快恢复缺血组织的血供；减少毒素吸收并注意保护多器官功能。     

完全随机型神经网络在1,6-二磷酸果糖制备条件优化上的应用

采用改进模拟退火法作为人工神经网络的学习算法,提出了适用于连续型输入变量、整体优化的完全随机型神经网络,并在1,6-二磷酸果糖制备条件优化中得到了成功应用,单位体积产率显著提高,为工业化生产提供了有利条件。     

全口义齿固位及稳定影响因素探讨

目的探讨提高全口义齿固位及稳定的方法。方法通过对患者在试戴及应用全口义齿出现的固位稳定不良现象进行检查分析,寻找出相应的改进方法。结果全口义齿固位不良主要原因是未建立平衡,其次是制作误差及口腔解剖条件差。结论提高全口义齿固位稳定性的有效方法是确保全口义齿良好的咬合关系,提高操作精确度,以弥补口腔条件差的缺陷。     

3-D多孔结构的小肠黏膜下组织在兔膀胱再生中的应用

目的 探讨3-D多孔结构的小肠黏膜下组织(small intestine submucosa,SIS)在新西兰大白兔膀胱再生中的应用.方法 用物理及化学方法制备具有3-D多孔结构的SIS.将24只雄性新西兰大白兔随机分为3组(n=8),分别行膀胱半切术建立膀胱缺损模型,使用3种不同处理的SIS进行膀胱重建.A组:未经过氧乙酸(peroxyacetic acid,PAA)处理的SIS组;B组:PAA处理的SIS组;C组:PAA处理后100％胎牛血清浸润的SIS组.3组在术前及术后4周测定膀胱容量,并于术后4周取材,行大体观察及组织学检测,评估膀胱再生情况.结果 应用SIS行兔膀胱重建术后4周,3组再生膀胱组织与周围组织粘连依次降低,结石率分别为33.3％、28.6％、14.31％.与术前自身比较,术后4周3组膀胱最大容量均缩小且依次增加,组间比较差异有统计学意义(P＜0.05).术后组织学检测示3组膀胱上皮细胞均有再生,与A组比较,B、C组的上皮再生更好,边缘区和中心区无明显差异.3组膀胱平滑肌的再生均不理想,但边缘区平滑肌再生较中心区多;在边缘区和中心区,组间比较差异有统计学意义(P＜0.05).3组在边缘区和中心区的再生血管面积依次增加,3组间比较差异有统计学意义(P＜0.05).结论 经PPA及胎牛血清处理后3-D多孔结构的SIS,具有良好的促进膀胱组织再生能力,是一种比较理想的修复支架材料.