Nebivolol induces endothelium-dependent relaxations of canine coronary arteries.

Nebivolol is a new beta 1-antagonist that acutely reduces arterial blood pressure without depressing cardiac function. The present study was designed to determine the effect of nebivolol on coronary arteries. Rings of canine left anterior descending coronary (LAD) artery with or without endothelium were suspended in organ chambers and the isometric tension was recorded. In some experiments, the transmembrane potential of the smooth muscle cells was recorded by electrophysiological methods. During contractions to prostaglandin F2 alpha, nebivolol induced concentration-dependent relaxations of the coronary arteries. The enantiomer, l-nebivolol, also induced comparable relaxations; however, d-nebivolol induced smaller relaxations. The relaxations induced by nebivolol and its enantiomer were significantly larger in tissues with than in those without endothelium. The differences between tissues with and without endothelium were abolished by nitro-L-arginine (3 x 10(-5) M) or methylene blue (10(-5) M). The nebivolol-induced relaxations were not affected by indomethacin (10(-5) M), phentolamine (5 x 10(-6) M), propranolol (5 x 10(-6) M), or methysergide (3 x 10(-6) M). Nebivolol at a subthreshold concentration for inducing relaxation (3 x 10(-7) M) did not significantly affect endothelium-dependent relaxations to acetylcholine but potentiated ADP-induced endothelium-dependent relaxations. The potentiation is stereoselective for l-nebivolol. Nebivolol induced a small hyperpolarization of the coronary smooth muscle with endothelium (1 mV).(ABSTRACT TRUNCATED AT 250 WORDS)     

选择性靶动脉栓塞在骶骨肿瘤切除术中的价值

目的 探讨和评估选择性靶动脉栓塞骶骨肿瘤后对外科切除肿瘤的价值和方法。方法 运用Seldinger技术，对9例骶骨肿瘤患者进行肿瘤供血动脉及肿瘤内血管全部彻底栓塞，栓塞材料应用明胶海绵，栓塞后1周内行手术切除术。结果 彻底的术前栓塞手术中失血量明显减少，9例骶骨肿瘤均得到彻底切除，平均失血量为1090ml。术后平均随访15个月，未见肿瘤局部复发。结论 骶骨肿瘤切除术前选择性靶动脉栓塞可有效减少术中出血，有利于肿瘤的彻底切除，为顺利切除骶骨肿瘤提供了有价值的方法。     

联合雾化吸入对老年支气管哮喘急性发作的疗效观察及护理

支气管哮喘是一种由多种细胞及细胞因子参与的慢性炎症性疾病。气道慢性炎症导致气道高反应,从而产生反复发作的喘息、胸闷、呼吸困难、咳嗽等相关症状,尤其多发于夜间及凌晨。我科自2005年6月开始采用特布他林、异丙托溴胺、布地奈德联合雾化吸入治疗老年哮喘急性发作取得满意疗效。现报告如下。1一般资料1.1对象我科2005年6月—2007年5月共收治老年支气管哮喘急性发作病人78例,年龄65岁~95岁(73.0岁±6.0岁),均符合诊断标准[1]。随机分为两组,对照组38例:男30例,女8例;治疗组40例:男35例,女5例。两组年龄、性别比较,差异无统计学意义(P>0…     

滨海沙土微量元素与木麻黄生长的关系

本文探讨了广东滨海沙土中微量元素B、Mo、Mn、Cu、Zn与木麻黄生长的关系,结果表明:B、Mo有利于促进生长与抗病,Cu含量高对生长有抑制作用,其余的作用不明显。     

视网膜缺血对兔视神经纤维损害的定量研究

目的：定量研究视网膜缺血对视神经的损害。方法：通过计算机图像分析定量测算视神经纤维数量；通过前房灌注平衡液，造成超高眼压，形成兔视网膜完全缺血模型，观察视神经纤维数量的变化。结果：正常兔眼平均视神经轴突数为１０９６０８±１４５６１（ｎ＝２２）；视网膜缺血眼视神经纤维数量明显减少（Ｐ〈０．００１）。结论：急性高眼压造成的视网膜缺血可使视神经节细胞及轴突的数量明显减少，应用计算机图像分析可定量检测这种     

The use of deep inspiration preceding the valsalva maneuver and rapid expiration in color doppler imaging of the lower extremity veins

Deep inspiration preceding Valsalva maneuver and rapid expiration immediately following it (DIVE) enhance venous blood flow on color Doppler flow imaging (CDI). The effect of DIVE was assessed in 115 consecutive lower extremity examinations. Of these, 95 or 115 (83%) had negative CDI sonograms, and 20 of 115 (17%) had partially (six of 115) or completely (14 of 115) occluding deep vein thrombosis. DIVE enhanced venous blood flow in 68% of the negative cases, resulting in transient venous distention, and/or more complete color filling, and/or greater spectral flow velocities. The 14 cases with completely occluding thrombi showed no response to DIVE. Six cases with partially occluding thrombi showed moderate to mild response to DIVE, with improved color delineation of the residual patent lumen around the thrombus. The authors conclude that DIVE facilitates deep venous CDI, especially when compression cannot be used to augment venous flow.     

磷酸铝凝胶剂的研制

以微粒沉降速度、粒度分布、粘度大小等为指标，利用正交试验法筛选出磷酸铝凝胶剂的最佳处方。结果表明，磷酸铝凝胶剂的沉降容积比可达９３．１％，其粒度均小于１０μｍ，而且沉降速度较小。     

结肠腺癌CEA的超微结构定位

用辣根过氧化物酶标记的癌胚抗原（ＣＥＡ）抗体，对结肠腺癌患者的手术标本进行了免疫组织化学染色，观察了ＣＥＡ在肿瘤组织及正常组织细胞中的分布。结果显示，正常结肠组织中，ＣＥＡ沿粘膜上皮细胞的游离面分布；结肠腺癌细胞则失去极性，ＣＥＡ除见于细胞游离面，在细胞侧面和基底面也呈阳性反应。提示ＣＥＡ在结肠细胞表面的分布失去极性可能是腺癌细胞的特点。     

肺癌放疗或化疗后的病理形态及PCNA,p53表达的观察

应用抗增殖细胞核抗原和抑癌基因ｐ５３蛋白的单克隆抗体对３７例放疗或化疗后的肺癌进行了检测，并与未经术前治疗的肺癌组织进行对照，部分组织进行了超微结构观察。结果发现：（１）放疗或化疗对肺癌组织细胞浆及胞核有不同程度的破坏。（２）放、化疗后组织（除分化型腺癌外）ＰＣＮＡ指数下降明显（Ｐ＜０．０１或Ｐ＜０．０５）。（３）放疗后肺癌组织ｐ５３表达率减低，但化疗后变化不明显。     

中国中原地区33555名妇女妇科疾病发生情况与五种因素关系的调查报告

自１９９２年３月至１９９４年５月，对中原地区４个省２０多个县（市）近２００个单位３３５５５名２０～７５岁的已婚妇女，进行妇科疾病发生情况与年龄、职业、文化、月经、孕产等五种因素关系的调查分析。在３３５５５名妇女中，患病者２２３７０人，总患病率为６６．６７％，查出妇科疾病４２种，计７６９７４例次。结果证明：以２５～３５岁年龄组发病率最高，其中以内生殖器炎症为主；职业以经商者发病率高，特别是性病患者高于其他职业者二倍以上；文化程度以小学、初中者发病率高，尤其宫颈炎更明显；月经情况：随着经前期紧张综合征的加重，更年期综合征发病率增高；孕产次数越多，患病率越高。本次调查未发现宫颈癌，进一步证明我国对妇女保健工作的关心和重视。