Norephedrine (phenylpropanolamine) stimulates oxygen consumption and lactate production in the perfused rat hindlimb

d,l-Norephedrine (phenylpropanolamine) which is both a demethylated analogue and a metabolite of d,l-ephedrine, is a reputed anorectic agent. In the present study the proposed most active isomer of this mixture, l-norephedrine has been assessed as a peripherally acting thermogenic agent in the isolated perfused rat hindlimb. l-Norephedrine produced a dose-dependent increase in oxygen uptake and perfusion pressure and increased lactate production. Whereas propranolol potentiated the increase in oxygen uptake and perfusion pressure produced by l-norephedrine, prazosin significantly and nitroprusside totally inhibited both of these changes. Nitroprusside also completely inhibited the increase in lactate production. We conclude that norephedrine has a hitherto unrecognized peripheral thermogenic activity in the perfused rat hindlimb resulting from its interaction with alpha 1 adrenergic receptors that control vasoconstriction in this tissue.     

合肥市部分人群SARS认知及行为态度

目的　了解合肥市部分人群对 SARS的认知情况及行为态度。方法　对合肥市两个社区及一所大学的部分人群共 1332人进行现况调查 ,比较不同性别、职业、文化程度对 SARS的总体认知水平。结果　合肥市人群对 SARS的认知情况尚好 ,总体平均得分 ( 15 .0 2± 1.98)分 (总分 18分 )。结论　合肥市居民对 SARS的认知水平总体较高 ,但存在群体差异 ,卫生行政部门应加强对公众的宣传教育 ,以提高全体居民的健康意识 ,进而预防 SARS的发生     

日晒海盐工人机体内高镁反应

报道福建某盐场从事日晒海盐生产人工机体内高镁对心血管系统的影响，通过现场空气、饮水、主良的镁含量测定，并对进入机体途径进行分析，得出空气、卤水接触、饮水为机体镁增高的主要来源。不同对象头发镁含量测定结果显示，以接触卤水、劳动强度大的盐工最高，并随机体内镁含量增高，出现血压偏低、心率减慢、心电图Ｐ－Ｒ间期延长、ＱＲＳ波增宽、Ｔ波高尖等机体高镁反应，与临床高镁血症相似。     

窒息新生儿生后24小时血糖的检测结果分析

目的 :探讨窒息新生儿生后 2 4小时血糖的变化及意义。方法 :93例新生儿于生后 2 4小时内、治疗前抽血送检 ,2 0例正常新生儿于生后次日清晨抽血送检。血糖由全自动生化分析仪进行分析。结果 :(1)重度窒息组血糖明显高于轻度窒息组及对照组。(2 )死亡儿血糖明显高于存活儿 (P <0 .0 0 1) ,且高血糖发生率亦高 (P <0 .0 0 1)。(3)重度窒息儿高血糖发生率明显高于轻度窒息儿 (P <0 .0 0 1)。结论 :窒息早期由于应激 ,儿茶酚胺及皮质醇分泌增加 ,促使血糖升高 ,与病情和预后有一定联系。病情越重 ,血糖越高 ,预后越差     

广东汉族人群HLA-Cw多态性及单体型分析

目的检测广东汉族人群HLA．Cw及HLA-A、B、DRB1基因频率，分析该人群HLA-Cw等位基因多态性及其单体型特点。方法骨髓移植供者185例，抗凝血提取DNA，半量全自动PCR-RSSO分型检测HLA-A、B、Cw、DRB1基因型。结果在分辨水平检出Cw等位基因11个，其中分布频率较高的依次为：Cw*03(0．2580)、Cw*07(0．1887)、Cw*01(0．1732)、Cw*08(0．1070)。统计分析呈现显著连锁不平衡的HLA-Cw．A单体型7个，HLA-Cw-B单体型20个，HLA—Cw．DRB1单体型10个。结论广东汉族群体HLA-Cw基因具有较为丰富的多态性，其与HLA-A、B、DRB1间连锁不平衡单体型具有地区性遗传特征。     

互联网与中医学教育

随着网络技术的飞速发展，互联网对中医学教育产生深远的影响。传统的中医学教育模式正面临着网络技术带来的冲击，文章提出了中医学教育应逐渐把以课堂教授为主的方式转向以网络互动式自学方式的观点。     

大鼠全脑照射后早期血清S-100B变化特征

目的 观察大鼠全脑不同剂量照射后1月内不同时间点血清中S-100B的变化,以探讨S-100OB在早期放射性脑损伤中的变化特征.方法 对大鼠予4 MeV电子线分别单次全脑照射2、10和30 Gv制备大鼠早期放射性脑损伤模型.采用酶联免疫吸附试验(ELISA)检测照射后1 h、6 h、12 h、24 h、3 d、1周、1个月血清中S-100B的浓度.结果 大鼠血清S-100B浓度在照射后6 h升高最明显,照射后12 h浓度下降,照后24 h再升高(除外2 Gy组为在照射后3 dR升高),随后下降直到最后观察时间点.结论 大鼠全脑照射后血清S-100B水平发生了变化,不同剂量组血清S-100B浓度有显著性差异,剂最越高,浓度越高.结果 提示S-100B可能会成为检测早期放射性脑损伤的重要血清指标.     

Influence of blood supply of the esophageal and gastric stumps on anastomotic healing after esophagogastrostomy in rabbits]

OBJECTIVE: To study how blood supply of the esophageal and gastric stumps influences the anastomotic healing after esophagogastrostomy in rabbits. METHODS: Twenty-seven New Zealand rabbits were randomly divided into 3 groups to receive esophagogastrostomy, followed by different procedures. Except for those in group I, all the rabbits were subjected to procedures of reducing the blood supply either of the esophageal or the gastric stump (group II and group III, respectively), followed by single-layer esophagogastric anastomoses using interrupted 5-0 polypropylene sutures. Ten days after operation, all the rats were killed and the anastomotic sites excised for measurement of the inner diameter, tensile strength, and hydroxyproline concentration. RESULTS: Healing of the esophagograstric anastomosis was obtained in all the rabbits but one with anastomotic leakage in group I and one with perforation of the gastric fundus in group III. The anastomotic inner diameters were similar in all the three groups, whereas the tensile strength and hydroxyproline concentration at the anastomoses decreased in group III in comparison with the other two groups (P<0.05) that had similar measurements (P>0.05). CONCLUSIONS: Extended length of the free esophageal stump does not significantly affect anastomotic healing as decrease of blood supply in the gastric stump.     

硝普钠结合控制性再灌注预防肺缺血再灌注损伤的实验研究

目的　探讨硝普钠结合控制性再灌注在预防肺缺血再灌注损伤中的作用及其机制。方法　将 1 4只猪随机分为对照组 (Ⅰ组 )和实验组 (Ⅱ组 )。对照组在去除肺动脉阻断 ,恢复自体血流前 ,给予控制性再灌注处理 (灌注液 :去白细胞∶改良Buckberg液 =4∶1 ,灌注压 1 8mmHg ,灌注时间 1 0min ,温度 37℃± 1℃ )。实验组在去除肺动脉阻断 ,恢复自体血流前 ,给予控制性再灌注 ,后经肺动脉以每分钟 1 .0 μg kg注入硝普钠 1 0min ,余处置同对照组。 0 .5 ,1和 2h后测血氧分压、肺血管阻力、肺顺应性及肺氧合功能变化 ,实验结束后 ,取肺组织测NO含量、MDA含量及肺含水量。结果　实验组的左肺氧合功能和肺顺应性明显好于对照组 (P <0 .0 5 )。肺循环阻力、丙二醛 (MDA)值及肺含水量均低于对照组 (P <0 .0 1 )。实验组肺中NO含量较对照组明显升高 (P <0 .0 1 )。结论　硝普钠结合控制性再灌注能明显降低肺缺血再灌注损伤 ,起到了较好的移植肺保护效果