当归芍药散活性部位DSS-A-N-30对大鼠离体子宫平滑肌收缩的影响

目的观察当归芍药散提取部位DSS-A-N-30对离体子宫平滑肌收缩的影响,并探讨其可能的作用机制。方法制备离体大鼠子宫肌条,观察DSS-A-N-30对子宫平滑肌自发性收缩,子宫收缩激动剂诱发的子宫平滑肌条剧烈收缩,KCl致子宫平滑肌条强直收缩及缩宫素(催产素)在无钙平衡盐溶液中致子宫平滑肌条持续收缩的影响。结果DSS-A-N-30(141.5,283和566mg.L-1)可以显著抑制子宫平滑肌的自发性收缩;对缩宫素(10IU.L-1)、前列腺素F2α(1mg.L-1)和乙酰胆碱(10μmol.L-1)引起的子宫平滑肌剧烈收缩有抑制作用;对KCl(60mmol.L-1)引起的子宫平滑肌强直收缩无明显作用;对缩宫素(10IU.L-1)在无钙平衡盐溶液中引起的子宫平滑肌条持续收缩有显著抑制作用。结论DSS-A-N-30可能主要通过抑制细胞内钙库释放而松弛子宫平滑肌,对子宫平滑肌收缩产生直接的抑制作用。提示DSS-A-N-30是当归芍药散的活性部位之一,有可能开发为新型痛经治疗药物。     

L-型钙离子通道阻断剂硝苯地平及硫酸镁对人足月妊娠子宫平滑肌收缩功能的抑制作用

目的:研究L-型钙离子通道阻断剂硝苯地平(nifedipine)、硫酸镁对人妊娠子宫平滑肌收缩功能的抑制作用及其与临产的关系.方法:剖宫产时取足月妊娠临产、未临产子宫下段平滑肌,将肌条置于组织器官浴中,加入催产素(10-9mol/L)诱发平滑肌收缩,依次加入10-8、10-7、10-6、10-5mol/L的硝苯地平或1、2、4、8、16 mmol/L的硫酸镁,通过离体肌肉等长张力测定试验,计算用药前后单位时间内子宫收缩的频率、收缩幅度及子宫收缩曲线下面积,并计算药物抑制百分比.结果:硝苯地平对催产素诱发的人妊娠子宫平滑肌收缩的抑制作用呈剂量依赖性,对临产组的抑制作用较未临产组明显减弱,两组比较差异显著(P<0.05);硫酸镁对人妊娠子宫肌收缩也有抑制作用,但临产组与未临产组比较差异不显著(P>0.05).结论:硝苯地平对临产后子宫平滑肌的抑制作用下降,可能提示临产后子宫平滑肌对硝苯地平的敏感性发生了改变;硫酸镁对人妊娠子宫肌的抑制作用与是否临产无关,提示Mg2 对子宫平滑肌收缩的抑制作用除通过钙离子通道外,可能还有其他作用机制.     

经左室流出道消融治疗疑似右室流出道起源室性早搏1例并文献复习

心室流出道(ventricular outflow tract,VOT)起源室性早搏(premature ventricular contraction,PVC)因临床常见,具有典型的心电图(ECG)特征,诊断并不困难,射频消融术是该病非药物治疗的主要手段。文中报道1例初步诊断右心室流出道起源(RVOT)的PVC的患者,于左心室流出道(LVOT)获得成功消融的诊治经过。文献复习了PVC定位的方法、VOT局部独特的解剖特点对定位的影响,以及三维标测新技术对PVC消融手术的帮助。     

Mechanisms underlying vasorelaxant action of astragaloside IV in isolated rat aortic rings

1. Astragaloside IV is a component from the widely used traditional Chinese herb Astragalus membranaceus and its effect on rat aortic ring contraction and relaxation were investigated. 2. The aorta from male Sprague-Dawley rats was isolated in an organ bath and ring tension was recorded with or without endothelium. Cumulative effects of astragaloside IV on vessel contraction and relaxation were observed in the presence of various antagonists related to vessel activity. 3. Astragaloside IV showed concentration-dependent inhibition of vessel contraction induced by phenylephrine and potassium chloride. The amount of calcium released from intracellular stores sensitive to phenylephrine was also markedly reduced by astragaloside IV. There was dose-dependent vasorelaxation in endothelium-intact rings, which was partly inhibited by pre-incubation with nitric oxide (NO) synthase (NOS) Nomega-nitro-L-arginine methyl ester and guanylate cyclase inhibitor, 1H-[1,2,4] oxadiazolo [4,3-alpha] quinoxalin-1-one. Astragaloside IV also induced a significant increase in aortic tissue content of guanosine 3",5"-cyclic monophosphate (cGMP) both in vivo and in vitro. Endothelial NOS inhibitor Nomega-nitro-L-arginine prevented vasodilatation, whereas neuronal NOS inhibitor 7-nitroindazole did not show significant influence on the vessel relaxation of astragaloside IV. 4. In conclusion, astragaloside IV inhibited vessel contraction through blocking calcium influx and intracellular calcium release. The endothelium-dependent vessel dilation of astragaloside IV was attributed mainly to the endothelium-dependent NO-cGMP pathway.     

胆胃舒颗粒预防胆囊结石及对胆囊收缩素受体(CCK-AR)基因表达的影响

目的:观察利胆健脾方胆胃舒颗粒对胆囊结石的预防作用及其作用机制。方法:实验用短毛雄性豚鼠90只,随机分为3组,每组30只,空白组:喂养普通饲料每天40g/只;模型组:喂养胆固醇结石诱石饲料40g/天/只;治疗组喂养胆固醇诱石饲料40g/天/只,并胆胃舒颗粒溶液灌胃2mL(含300mg胆胃舒颗粒)。实验2个月后观察胆囊内结石情况、胆囊收缩功能、及胆囊、胃窦平滑肌CCK-AR最大结合容量;结果:胆囊结石情况:空白组3.33%(1/30);模型组92.59%(25/27);治疗组:10.71%(3/28)。胆囊收缩功能:空白组为66.83%±5.34%;模型组43.06%±4.27%;治疗组67.93%±6.82%;胆囊平滑肌CCK-AR基因表达:空白组0.862±0.112;模型组0.521±0.083;治疗组0.792±0.098。结论:利胆健脾法可降低胆囊结石的形成,其作用机制可能通过提高胆囊CCK-AR基因表达,从而加强胆囊收缩功能,促使胆汁流动,防止胆囊结石的发生。     

海带多糖对心理应激大鼠血管内皮细胞释放血管舒缩因子的调节作用研究

目的 探讨海带多糖对心理应激大鼠血管内皮细胞释放血管舒缩因子的调节作用.方法 采用心理应激方法复制血管内皮损伤模型,大鼠随机分为对照组、模型组、海带多糖低剂量组(LP-L组)、海带多糖高剂量组(LP-H组)及低分子肝素组.造模后取血,用ELISA法检测血浆肾上腺素、血管性血友病因子(vWF)、一氧化氮水平,用放射免疫计数法检测血浆内皮素(ET)、6-酮-前列环素F1 α(6-Keto-PGF1 α)、血栓素B2(T×B2)水平,用离体胸主动脉环实验观察血管内皮依赖性舒缩反应.结果 与对照组比较,模型组、LP-L组、LP-H组及低分子肝素组血浆肾上腺素水平显著升高;LP-H组血浆NO、6-Keto-PGF1 α水平显著升高,血浆vWF、ET水平显著降低,血管环内皮依赖性舒缩功能明显改善.结论 海带多糖可以调节血管内皮细胞舒缩因子的释放,该机制与其保护血管内皮细胞的作用有关.     

膝关节损伤后远期肌力改变的分析

目的 :分析膝关节韧带、半月板等损伤后股四头肌、绳肌远期肌力改变的情况 ,以探讨损伤后远期肌力改变与肌肉收缩类型的关系、向心收缩 /离心收缩比值和拮抗肌比值等反映膝关节稳定性指标的变化、优势下肢膝关节损伤的特点及肌力改变与损伤时间的相关关系。方法 :应用Kin-Com等速测试装置分别测定 3 8例膝关节损伤后受试者等长收缩肌力峰值、60°/sec和 1 80°/sec角速度下向心收缩、离心收缩力矩峰值。结果 :(1 )损伤侧与非损伤侧股四头肌在不同测试条件下远期肌力存在显著差异 (P <0 0 5 ) ,同名肌群肌力缺失百分比 >1 0 % ;(2 )损伤侧与非损伤侧绳肌在不同测试条件下远期肌力无显著性差异 (P >0 0 5 ) ;(3 )损伤侧膝关节以 60°/sec角速度向心收缩、离心收缩时远期肌力减退程度显著高于等长收缩时远期肌力的减退程度 (P <0 0 5 ) ;(4 )等速测试时损伤侧与非损伤侧的向心收缩/离心收缩比值无显著差异 (P >0 0 5 ) ,且均 <1 0 0 % ;(5 )损伤侧膝关节拮抗肌比值范围为 5 0 %～ 80 % ;(6)优势下肢膝关节损伤患者股四头肌远期肌力减退程度显著高于非优势下肢膝关节损伤患者 (P <0 0 5 ) ;(7)等长收缩、向心收缩、离心收缩远期肌力缺失百分比与损伤时间无显著相关关系 (P >0 0 5 )。结论 :膝关节     

黄芪总皂甙对在体犬心功能的影响

结扎左冠状动脉前降支中点或最大斜角支根部，造成麻醉犬急性心肌梗塞模型，用ＲＭ一６０００多道记录仪动态监测心功能和心电图，并进行实验性治疗。证实黄芪总皂甙能明显改善心梗大的心肌收缩性能，增加冠脉流量，对心功能有保护作用。     

Mechanism of change in cardiac function after mitral valve replacement

Left ventricular contractility was measured using Doppler echocardiography in 37 pa-tients with rheumatic mitral valve disease.Myocardial pathological lesions were studied quanti-tatively by means of the image analysis system and light microscopic examination.The resultsshowed that attenuated cardiac function is due to pathological change of the mitral valve andpathological lesions of the left ventrieular myocardium including increased interstitial fibrosis,thickened intramyocardial arterial wall leading to concentric narrowing of the lumen,hyper-trophic myocardial fiber and endocardial proliferation.Since mitral valve replacement can notcorrect the irreversible myocardial pathological lesions,perioperative protection of the my-ocardium should be emphasized,and intraoperative injury to the myocardium should be mini-mized as far as possible.     

宁夏枸杞煎剂对家兔离体子宫的影响

通过11只家兔离体子宫实验,检测了宁夏枸杞果两种不同稀释度的浓煎液对子宫自动节律收缩运动的影响。结果,应用稀释50倍的W液前后,子宫角的收缩运动频率平均增加了19.58频次/10分钟,P<0.02;张力平均增强了7.14毫米,P<0.05;收缩运动强度(以幅度表示)平均增大2.17毫米,P>0.05,<0.1。此外,在三次实验中,用药前子宫角自动节律收缩波不明显,加药后即明显表现出来。以上检测结果提示,枸杞果煎液具有兴奋子宫和促进子宫自动收缩运动的作用。