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1.
目的 :研究血管钠肽 (VNP)对心肌细胞收缩的作用及其机制 ,观察 HS- 14 2 - 1、8- Br- c GMP和镁蓝 (methyleneblue,MB)对心肌细胞收缩的影响。方法 :采用单心肌细胞动缘探测技术检测细胞收缩的幅度。结果 :10 - 1 0、10 - 9、10 - 8、10 - 7、10 - 6 m ol/L Iso可剂量依赖性地引起心肌细胞收缩增强 ,与对照组相比较分别增强 (13± 3) %、(2 6± 2 )%、 (6 0± 5 ) %、(15 3± 4 ) %和 (312± 7) %。此效应可被普萘洛尔 (10 - 6 mol/L )所阻断。 10 - 1 0 、10 - 9、10 - 8、10 - 7、10 - 6 m ol/L VNP可剂量依赖性地抑制 Iso(10 - 8mol/L)引起的心肌细胞收缩幅度的升高 ,与 Iso(10 - 8mol/L)相比较分别减弱 (99± 3) %、(95± 2 ) %、(84± 6 ) %、(6 6± 3) %和 (6 1± 3) %。 8- Br- c GMP(10 - 7~ 10 - 3m ol/L)也可剂量依赖性地抑制 Iso(10 - 8mol/L)引起心肌细胞收缩的增强。钠尿肽鸟苷酸环化酶 (guanylate cyclase,GC)受体的特异性阻断剂 HS- 14 2 - 1(2× 10 - 5mol/L)使 VNP的作用几乎完全消失。MB是 GC的抑制剂 ,10 - 5mol/L MB不但使VNP的作用完全消失 ,而且增强心肌细胞收缩的效应。VNP和 HS- 14 2 - 1本身对心肌细胞收缩无显著影响。而 MB使心肌细胞收缩幅度升高。结论 :VNP作用于心肌细?  相似文献   

2.
血管利钠肽对大鼠肺动脉的舒张作用及机理   总被引:4,自引:1,他引:4  
血管利钠肽(VNP)是新的空工合成的由27个氨基酸残基组成的肽类物质,它是心房利钠利脲肽(ANP)和C型钠利尿肽(CNP)的杂交物,我们采用离体血管灌流的方法观察了VNP对离全大鼠肺动脉和腹主动脉的舒张作用,表明VNP对内皮完整的与去皮内的肺动脉和腹主动脉均有浓度依赖性舒张作用,其对抗去甲肾上腺素(10μmol/L)或KCl(60mmol/L)收缩肺动脉的最大舒张效应明显大于腹主动脉,内皮完整和去  相似文献   

3.
血管利钠肽减弱去甲肾上腺素对心肌生长的刺激作用   总被引:3,自引:0,他引:3  
于军  冯华松 《心功能杂志》1999,11(3):145-148
本实验目的在于研究血管利钠肽对去甲肾上腺素促心肌生长作用的影响,并对其机制进行探讨。分离,培养乳鼠心肌细胞,完全随机分为三组;对照组,NE组和VNP+NE组。以MTT法和总蛋白含量测定法观察各组细胞的生长情况。进而采用放射免疫方法研究了VNP对细胞内cGMP,cAMP水平的影响。/  相似文献   

4.
血管利钠肽对大鼠肺动脉的舒张作用及机理   总被引:2,自引:0,他引:2       下载免费PDF全文
血管利钠肽(VNP)是新近人工合成的由27个氨基酸残基组成的肽类物质,它是心房利钠利尿肽(ANP)和C型利钠利尿肽(CNP)的杂交物。我们采用离体血管灌流的方法观察了VNP对离体大鼠肺动脉和腹主动脉的舒张作用。表明VNP对内皮完整的与去内皮的肺动脉和腹主动脉均有浓度依赖性舒张作用,其对抗去甲肾上腺素(10μmol/L)或KCl(60mmol/L)收缩肺动脉的最大舒张效应明显大于腹主动脉;内皮完整和去内皮组之间无显著性差异;在浴槽内预先加入优降糖可显著减低肺动脉和腹主动脉对VNP的舒血管效应,预先加入心得安则不明显影响VNP对肺动脉和腹主动脉的舒血管作用。提示VNP对上述血管的舒张作用不依赖于内皮的存在,但受ATP敏感性钾通道的调控  相似文献   

5.
本实验目的在于研究血管利钠肽( V N P)对去甲肾上腺素( N E)促心肌生长作用的影响,并对其机制进行探讨。分离、培养乳鼠心肌细胞,完全随机分为三组:对照组、 N E组和 V N P+ N E组。以 M T T法和总蛋白含量测定法观察各组细胞的生长情况。进而采用放射免疫方法研究了 V N P对细胞内c G M P,c A M P水平的影响。结果发现: N E(10- 7 m ol/ L~10- 5 m ol/ L)可以使培养的乳鼠心肌细胞 M T T O D值显著升高( P< 0.05 vs 对照组),并且具有剂量依赖性。 V N P(10- 7 m ol/ L)可以显著降低 N E(10- 6 m ol/ L) 刺激的心肌细胞 M T T O D值和细胞内总蛋白含量( P<0.05 vs N E组)。对照组和 N E组细胞内c G M P,c A M P水平无显著差异,而 V N P(10- 7 m ol/ L)能升高细胞内c G M P水平,降低c A M P水平( P< 0.05 vs对照组、 N E组)。提示 V N P能减弱 N E对心肌生长的刺激作用,其机制可能与c G M P,c A M P等信号转导分子有关。  相似文献   

6.
血管钠肽抑制心肌增殖与机制的研究   总被引:1,自引:1,他引:1       下载免费PDF全文
应用 NE、低氧或佛波酯 (PMA)等方法刺激心肌细胞和心成纤维细胞的增殖 ,实验证明血管钠肽对增殖有抑制作用 ,它通过升高细胞内 c GMP和降低细胞内 Ca2 + 浓度等发挥作用 ,对肺动脉平滑肌细胞的增殖也有抑制作用 ,表明 VNP对心肌细胞、心成纤维细胞和肺动脉平滑肌细胞有负调控作用 ,对心肌肥大和低氧性肺动脉高压有预防和治疗作用  相似文献   

7.
目的 观察血管钠肽(VNP)对大鼠腹主动脉的舒张作用及对ATP敏感性钾通道(ATP-sensitive potassium channel,KATP)的作用。方法 采用离体血管灌流方法,测定VNP对血管环张力的影响。采用膜片钳方法观察VNP对KATP通道的影响。结果 VNP对大鼠的腹主动脉具有浓度依赖性舒张作用,该作用无内皮依赖性:VNP对内皮完整的腹主动脉最大舒张率(Emax)为(81±8)%,对内皮缺失腹主动脉Emax为(74±6)%。在浴槽内预先孵育优降糖(1×10-6 mol/L)可降低血管对VNP的舒张效应。VNP可增强腹主动脉血管平滑肌细胞KATP通道电流: VNP(1×10-6 M)增强KATP通道Emax为(112±24)%,优降糖(1×10-6 mol/L)可消除这一作用。结论 VNP有舒张血管作用,这一作用与增强KATP通道电流有关。  相似文献   

8.
血浆心钠肽(type A natriuretic peptide,ANP)、脑钠肽(typeB natriuretic peptide,BNP)水平在心血管疾病的诊断、治疗及预后判定等方面均有重要的临床价值,尤其对于心力衰竭方面的应用更为广泛。研究发现在心房颤动(atrialfi rillation,AF)患者中血浆BNP水平明显升高〔1〕,表明其参与了AF发生的病理生理机制。临床中存在一部分左室射血分数(LVEF)正常的心力衰竭患者,美国ACC/AHA2005年成人慢性心力衰竭诊断和治疗指南将其称为LVEF正常的心力衰竭。这些患者左心室舒张功能与ANP、BNP水平的关系尚未完全阐明,尤其是合并心房颤…  相似文献   

9.
脑钠肽(brainnatriureticpeptide,BNP)是利钠肽家族的一种肽类激素,具有排钠利尿、松弛血管平滑肌及抑制醛固酮分泌等作用,参与心血管系统的病理生理学全过程。目前BNP在临床的诊断、鉴别和治疗都有广泛的应用,现就BNP的生物活性、生理作用和在心力衰竭方面的最新中西医临床应用作一综述。1BNP的生物活性1981年deBold等[1]在大鼠的心房组织中分离出一种能利钠、扩血管的多肽类物质即心钠素(ANP)。1988年由日本学者Sudoh等[2]从猪脑中分离出了另一种多肽类物质,由于最先从猪脑中分离所以又称为脑钠素(BNP),后来在心脏中也分离出BNP…  相似文献   

10.
采用3H-胸腺嘧啶掺入研究了血管活性肠肽(VIP)对我院所建一株人胰腺癌细胞生长的影响,并对该细胞株进行VIP受体、受体后细胞内介质cAMP和多胺产生的研究。发现VIP在10-8M和10-7M对具有VIP受体的人胰腺癌细胞有明显促生长作用,且成浓度依赖关系,这种作用可被其受体拮抗剂(4-Cl-D-phe6,Leu17)VIP所阻断;VIP能显著促进本株人胰腺癌细胞细胞内cAMP及多胺的产生,表明VIP的促生长作用可能与细胞内cAMP和多胺的生物合成增加有关;本株细胞在培养过程中可向培养基中分泌一定量的VIP,VIP抗体能抑制其在无血清培养基中生长,提示VIP对本株人胰腺癌细胞的生长有自分泌调节作用。  相似文献   

11.
目的 :探讨血管钠肽 (VNP)对肺动脉平滑肌细胞 (PASMC)增殖及钠尿肽 B受体 (NPR-B)基因表达的影响。方法 :体外培养大鼠 PASMC,分别用噻唑蓝 (MTT)比色法、总蛋白含量测定、放免分析及打点杂交的方法 ,观察了VNP作用下 PASMC的 MTT吸光值、总蛋白含量、细胞内 c GMP、c AMP浓度和 NPR-B的 m RNA水平。结果 :VNP可以显著抑制血清刺激的 PASMC增殖 ,升高细胞内 c GMP浓度及 NPR-B m RNA水平 ,但对细胞内 c AMP浓度无明显影响。结论 :VNP对 PASMC增殖及 NPR-B基因表达具有调控作用 ,并且可能通过 c GMP途径发挥上述作用  相似文献   

12.
目的比较LPYP20压迫止血器和Medplus桡动脉止血带在经皮冠状动脉介入治疗后桡动脉止血中的安全性、有效性及优缺点。方法经桡动脉行经皮冠状动脉介入治疗的患者116例,电脑数字随机法分成两组,其中64例采用LPYP20压迫止血器,52例采用Medplus桡动脉止血带。观察两组术后止血情况、桡动脉闭塞及局部并发症情况并进行对比。结果两组术后均能成功止血。两组在出血及桡动脉闭塞方面比较,差异无统计学意义(P0.05);在包扎远端肿胀、麻木、皮肤破损方面,Medplus桡动脉止血带优于LPYP20压迫止血器[17.3%(9/52)vs.35.9%(23/64),P0.05;13.5%(7/52)vs.32.8%(21/64),P0.05;1.9%(1/52)vs.12.5%(8/64),P0.05]。结论两种压迫器均能成功达到止血目的 ,但Medplus桡动脉止血带对周围组织压迫更少,对皮肤损伤更小。  相似文献   

13.
目的探讨老年女性患者经鼻烟壶处桡动脉行冠状动脉造影和PCI的可行性和安全性。方法选择行冠状动脉造影和(或)PCI的老年女性患者100例,根据穿刺部位不同随机分为鼻烟壶组50例(穿刺鼻烟壶部位)及经典组50例(穿刺常规桡动脉)。观察2组穿刺时间、穿刺成功率、手术时间、手术成功率、置入支架、穿刺部位出血、血肿、动脉瘤及桡动脉闭塞率等情况。结果 2组血管内径、穿刺时间、穿刺成功、手术成功、手术时间、置入支架、术后血肿、动脉瘤和动静脉瘘发生率比较,差异无统计学意义(P>0.05)。鼻烟壶组桡动脉痉挛、闭塞和总并发症发生率较经典组明显降低(2%vs 8%,2%vs 10%,6%vs 20%,P<0.05)。结论老年女性患者经鼻烟壶桡动脉途径的桡动脉痉挛发生率及闭塞率更低,安全性好,可以作为常规桡动脉的替代途径应用于冠状动脉诊疗。  相似文献   

14.
We report a new technique of arterial access through the ipsilateral interosseous artery in a case of late radial artery occlusion (RAO). RAO, although not frequent, is a limiting iatrogenic complication after transradial intervention (TRI) and precludes repeat use of the same radial artery for future procedures. Our technique involves obtaining access to the ipsilateral radial artery (RA) in the distal postocclusion segment and use of collateral channel between this segment and the interosseous artery (IOA) for advancing a guidewire and sheath in the IOA lumen and in brachial artery thereafter. © 2017 Wiley Periodicals, Inc.  相似文献   

15.
We report a new technique for treatment of radial artery pseudoaneurysm (RAP) caused by transradial access (TRA) for coronary angiography. Traditional extrinsic compression with radial flow cessation leads to a local milieu likely associated with an increase in probability of radial artery occlusion (RAO). Our technique involves obtaining ipsilateral radial artery access distal to the neck of the RAP followed by a prolonged sheath dwell time covering the neck of the RAP which allows the RAP sac to thrombose and maintains radial artery lumen patency. © 2016 The Authors. Catheterization and Cardiovascular Interventions Published by Wiley Periodicals, Inc.  相似文献   

16.
《Indian heart journal》2022,74(4):322-326
BackgroundThe distal radial artery (dRA) approach at anatomical snuff box has gained attention of the interventional cardiologist in last few years. The procedural success rate by this novel approach depends on size of the radial artery and therefore the study was planned to study the size of distal radial artery.MethodsTotal of 1004 patients of >18 years of age undergoing coronary catheterization were included in the study. The vessel diameter was measured from media to media in the anatomical snuff box a day prior to coronary catheterization.ResultsThe mean diameter of right radial artery at conventional access site was 2.56 ± 0.35 mm and at distal access site 2.23 ± 0.39 mm (p < 0.001). Females had significantly smaller radial artery diameter as compared to males at right conventional access site (2.42 ± 0.36 mm vs 2.60 ± 0.34 mm; p < 0.001) and distal access site (2.09 ± 0.38 mm vs 2.27 ± 0.39 mm; p < 0.001). The diameter of the right dRA was not significantly correlated with age (r2 linear = 0.002, p = 0.0475) but was positively correlated with height and weight (r2 linear = 0.076, p = <0.001 and r2 linear = 0.005, p = <0.001) and negatively correlated with BMI (r2 linear = 0.076, p = 0.519).ConclusionsThis study has shown the size of right dRA 2.27 + 0.39 mm in males and 2.09 + 0.38 mm in females. Diabetes, hypertension, height and weight are important predictors of dRA diameter.  相似文献   

17.
The radial artery is being used with increasing frequency to replace the saphenous vein as a coronary artery bypass graft, in the belief that it will provide improved long-term patency. Several centers have confirmed that the early results of surgery using the radial artery seem to be better than those obtained with saphenous grafts. Despite these apparent gains, early failure of the radial artery graft can occur and is frequently associated with symptomatic myocardial ischemia. Percutaneous angioplasty is an alternative to reoperation to treat lesions occurring on radial artery grafts. We report on 4 patients who underwent angioplasty of radial artery grafts. Cathet. Cardiovasc. Diagn. 45:400–404, 1998. © 1998 Wiley-Liss, Inc.  相似文献   

18.
Coronary angioplasty with 6F guiding catheters via the radial artery is associated with a minimal risk for major entry site-related complications. Although the incidence of radial artery occlusion (RAO) in the literature is approximately 30% after prolonged cannulations, little is known about the incidence and its clinical consequences of RAO following transradial percutaneous coronary angioplasty. In a prospective study, 563 patients with a normal Allen test were evaluated on patency and function of the radial artery after transradial angioplasty, by physical and ultrasound examination at discharge, and at 1 month follow-up. At discharge, 30 patients (5.3%) had clinical evidence of RAO. At follow-up, persistent RAO was found in 16 patients (2.8%). In this study we found a low incidence of RAO after transradial percutaneous coronary angioplasty. None of the patients with temporary or persistent RAO had any major clinical symptoms. Therefore, the occurrence of RAO can be considered a minor complication in patients with a previously good double blood supply to the hand. Cathet. Cardiovasc. Diagn. 40:156–158, 1997. © 1997 Wiley-Liss, Inc.  相似文献   

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