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1.
[目的]:观察骨髓间充质干细胞(MSC)对新生大鼠高氧肺损伤的治疗作用.[方法]贴壁法体外培养扩增大鼠骨髓MSC,利用携带GFP基因的慢病毒液对骨髓MSC进行转染;SD新生大鼠随机分为A、B、C、D、E五组,A,B两组高氧暴露7d后经尾静脉分别注射(1×105/只和1×104/只)骨髓MSC,C组注射磷酸盐缓冲液(PBS),D、E两组为空气组,分别注射骨髓MSC和PBS,观察骨髓MSC在大鼠肺组织的分布情况、大鼠的体质量增长、肺系数、放射性肺泡计数(RAC)及肺组织的病理改变.[结果]A、B、D组肺组织中均可见GFP+细胞;MSCs干预3、7d,A,B两组GFP+细胞占总细胞数的比例高于D组(31.3±2.6% vs.11.8±1.3%,A组vs.D组,22.7±1.3% vs 11.8±1.3%,B组vs.D组,P< 0.05);A组治疗第3、7、14天GFP+细胞占总细胞数的比例高于B组,P< 0.05;A、B两组治疗后体质量增长加快(66±9 g vs.48 ±7 g,A组vs.C组,P<0.05),肺系数降低(2.26±0.23% vs.2.9±0.4%,A组vs.C组,P< 0.05),RAC值明显增加(9.2±0.7 vs.7.4±0.4,A组vs.C组,P< 0.05),肺部炎性反应减轻;A组对高氧肺损伤的治疗作用优于B组,P<0.05.[结论]两种剂量的骨髓MSC均可以减轻高氧肺损伤,高剂量组对高氧肺损伤的治疗效果更明显.  相似文献   

2.
目的 对比分析腹腔注射氢气(H2)和富氢生理盐水对高氧致新生大鼠肺损伤的作用.方法 将SD新生大鼠分为6组(每组10只),A组(空气组)、B组(空气十富氢生理盐水组)、C组(空气+ H2组)、D组(高氧组)、E组(高氧十富氢生理盐水组)、F组(高氧+ H2组).A、B、C组置于空气中,D、E、F组置于95% O2中,B、E组每日腹腔注射富氢生理盐水2次(10 mL/kg),C、F组每日腹腔注射H2 2次(10mL/kg),A、D组每日腹腔注射普通生理盐水2次(10mL/kg).于实验第15天收集肺组织和血清标本,苏木精-伊红(HE)染色后光镜下观察肺组织病理改变和辐射状肺泡计数(RAC),碱水解法检测肺组织羟脯氨酸(HYP)、血清丙二醛(MDA)、超氧化物歧化酶(SOD)水平,免疫组织化学SP法检测肌成纤维细胞袁型标志α-平滑肌肌动蛋白(α-SMA)表达.结果 与A组相比,D组RAC、血清SOD活力明显降低,HYP、MDA水平及α-SMA表达均明显增加,H2干预可显著缓解高氧所致上述变化,腹腔注射H2较腹腔注射富氢生理盐水效果更佳.结论 H2可一定程度减轻高氧导致的肺氧化损伤、发育受阻及纤维化指标,腹腔注射H2较腹腔注射高氢生理盐水效果更佳.  相似文献   

3.
致死性高浓度氧对新生鼠发育和肺损伤的影响   总被引:2,自引:0,他引:2  
目的探讨致死浓度氧(95%)与新生鼠肺发育及损伤的关系,建立支气管肺发育不良动物模型。方法将3dSD新生鼠随机分为高氧(95%)和空气氧组,并和成年鼠对照,观察记录体质量、身长;HE染色观察肺组织形态结构,做辐射状肺泡计数(RAC)。结果(1)高氧新生鼠和成年鼠死亡率分别为12.5%、35.2%,与正常空气氧组比较,新生鼠体质量(18.02±0.68vs13.24±0.59)和身长(8.83±0.25vs6.76±0.51)增长明显减少(P<0.05)。(2)高氧新生鼠RAC值为9.50±1.05,较正常同日龄新生鼠(13.00±1.79)明显减少(P<0.05),高氧成年鼠RAC值(12.67±2.25)比高氧新生鼠为高(P<0.05),跟正常空气组新生鼠差异不明显(P>0.05)。(3)10d新生鼠肺结构已接近成年鼠肺,高氧组新生大鼠可见肺泡壁较薄、结构简单化、数目明显减少,肺泡大小不均,有些肺泡融合、体积增加,部分间隔细胞增多,小血管扩张、充血;成年鼠高氧组肺间质水肿、肺间隔增厚、肺泡腔缩小,肺间隔伊红显色强度增强,肺泡腔内出现红细胞、巨噬细胞及脱落的肺上皮细胞。结论新生大鼠暴露于92% ̄95%氧7d可致生长障碍和肺泡化阻滞,出现类似早产儿支气管肺发育不良的肺组织形态特征。  相似文献   

4.
目的观察宫内炎性致敏及生后高氧暴露新生小鼠转化生长因子-β1(transforming growth factor-β1,TGF-β1)、平滑肌肌动蛋白(α-smooth muscle actin,α-SMA)在新生鼠肺组织的表达情况,探讨支气管肺发育不良(Bronchop-ulmonary dysplasia,BPD)发病机制。方法新生小鼠按照随机数字表法分为LPS组+空气组、LPS+高氧组、生理盐水+空气对照组、生理盐水+高氧组,应用HE染色、放射性肺泡计数(RAC)、免疫组织化学、免疫荧光化学和荧光定量PCR技术,讨论生后第1、3、7、10、14天肺组织的病理改变,检测TGF-β1、α-SMA蛋白和基因mRNA表达水平。结果LPS+高氧组和生理盐水+高氧组出现肺发育障碍,肺泡逐渐融合,RAC逐渐降低,与生理盐水+高氧组比较,LPS+高氧组降低明显(P<0.05)。②LPS+高氧组和生理盐水+高氧组第3天后肺组织TGF-β1蛋白表达明显高于LPS组+空气组和生理盐水+空气组(P=0.000),随着暴露时间的延长进行性增高。③LPS+高氧组和生理盐水+高氧组7d后肺组织α-SMA蛋白表达明显高于LPS组+空...  相似文献   

5.
刘雪雁  徐刚  薛辛东 《中国现代医学杂志》2008,18(16):2278-2282,2286
目的 探讨MMP-9(基质金属蛋白酶-9)和TIMP-1(基质金属蛋白酶抑制物-1)在高氧致CLD新生大鼠肺组织中的动态变化和在Ⅳ型胶原重塑中的作用.方法 足月新生大鼠在生后12 h内分别持续吸入浓度为0.90~0.95的高氧和空气,于1,3,7,14和21 d,应用免疫组化的方法分别检测肺组织MMP-9和TIMP-1蛋白表达的动态变化,同时采用ELISA法动态检测肺组织中Ⅳ型胶原蛋白含量.结果 MMP-9在高氧3 d时的表达较空气组增强,蛋白平均灰度值为:(126.23±6.95) vs (130.38±7.36),P<0.05,其余时间点两组比较差异无显著性;TIMP-1在3 d后高氧组肺组织的表达均高于空气组,3 d和7 d时平均灰度值为:(126.22±6.49)vs(129.49±4.75),(119.70±7.33)vs(124.99±6.83)(P<0.05),14 d和21 d差异有显著性,值为(112.35±10.29)vs(120.08±7.77),(109.19±10.56)vs(118.22±6.32)(P<0.01);高氧组ColⅣ含量在14 d[(24.78±5.42)vs(14.90±2.44),P<0.05]和21 d[(40.27±1.94)vs(26.13±1.94),P<0.01]均高于空气组.结论 新生大鼠随着吸入高氧时间的延长,MMP-9/TIMP-1的平衡状态遭到破坏,Ⅳ型胶原降解失衡,促进了早期基膜损伤的加重和晚期伴有Ⅳ型胶原沉积的肺纤维化.  相似文献   

6.
骨髓间充质干细胞对高氧暴露新生大鼠肺损伤的干预作用   总被引:1,自引:0,他引:1  
目的 研究大鼠骨髓间充质干细胞(MSC)对高氧引致新生大鼠肺组织损伤的干预作用.方法 采用贴壁选择法分离、培养、扩增大鼠骨髓MSC,并以5-溴脱氧尿嘧啶核苷(BrdU)进行标记,注射前以磷酸盐缓冲液(PBS)稀释;32只3日龄SD大鼠随机分为4组:A、C组高氧(95%)暴露7 d后,腹腔分别注射含和不含5×104MSC的PBS各50μl;B、D组空气暴露7 d后,腹腔分别注射含和不含5×104MSC的PBS各50μl.于注射后72 h(13日龄)腹腔注射10%水合氯醛后放血处死,肺组织病理学检测辐射状肺泡计数(RAC);支气管肺泡灌洗液(BALF)细胞计数检测白细胞及其中性粒细胞;ELASA法检测肺组织匀浆肿瘤坏死因子(TNF)-α、白细胞介素(IL)-1β含量.免疫组化双染法检测BrdU和肺泡表面活性物质结合蛋白a(sP-A)表达情况.结果 (1)RAC(个):4组比较差异有统计学意义(11.0±1.0、13.9±1.1、9.6±0.7、14.0±1.1,P=0.000);A、C组均明显低于D组(均P<0.05),A组高于C组(P<0.05).(2)BALF细胞计数:4组白细胞(105/ml:0.85 ±0.21、0.18±0.10、1.44±0.69、0.21±0.06)和中性粒细胞(105/ml:0.32±0.12、0.06±0.02、0.73±0.35、0.07±0.02)计数比较,差异均有统计学意义(均P=0.000);A、C组均明显高于D组(均P<0.05);A组均低于C组(均P<0.05).(3)肺组织匀浆TNF-α及IL-1β含量:4组肺组织匀浆TNF-α(pg/ml:173±20、34±4、224 ±42、35±4)及IL-1β含量(pg/ml:530±74、210±33、948±82、216±30)比较,差异均有统计学意义(均P=0.000);A、C组均明显高于D组(均P<0.05),A组低于C组(均P<0.05).(4)免疫组化:A、B组均有BrdU及SP-A阳性细胞,A组还可见免疫双染阳性细胞;C、D组仅见SP-A阳性细胞.结论 腹腔注射Msc对高氧暴露新生大鼠的肺损伤起保护作用,其保护作用涉及多种机制.  相似文献   

7.
目的观察高氧对新生鼠肺微血管发育的影响。方法以新生鼠慢性高氧肺损伤28例和对照24例为研究对象,在实验3、7和14d观察肺组织病理、微血管超微结构变化,放射性肺泡计数(RAC)。结果高氧组3d微血管发生炎症反应,血管基底膜增厚、断裂;7d炎症反应明显,血管腔被炎细胞和坏死的内皮细胞堵塞,血管减少;14d毛细血管稀少,间质有胶原纤维沉积,气血屏障增厚。高氧组RAC值7天降低(6.87±1.11)vs(7.53±0.86),P<0.05,14d差异更显著(P<0.001)。结论炎症是高氧肺微血管损伤的一个始动环节,由此导致的毛细血管闭塞可能是微血管减少的一个重要原因。提示控制炎症反应可能是治疗和预防高氧肺损伤的有效手段。  相似文献   

8.
目的 研究静脉注射大鼠骨髓间充质干细胞(MSCs)对高氧新生大鼠肺损伤的影响.方法 采用贴壁选择法分离、培养、扩增大鼠骨髓来源MSCs,并以5-溴脱氧尿嘧啶核苷(BrdU)进行标记.3 d龄清洁级SD新生大鼠32只,随机分为A、B、C、D四组,每组8只.A、B两组均先将动物置于95%氧环境下,而C、D组则置于空气环境下;7d后,A、C组每只尾静脉注射含5×104MSCs的PBS 50μl,B、D组同时仅给予PBS 50μl,并将大鼠全部置于空气环境下,72 h后处死全部动物,病理学检测肺组织辐射状肺泡计数(RAC),免疫组织化学检测BrdU表达情况,ELASA法检测肺组织匀浆肿瘤坏死因子α(TNFo)、转化生长因子β1(TGFβ1)含量.结果 与空气暴露(C、D)组相比,两高氧(A、B)组RAC值显著降低,TNFα、TGFβ1等显著增加;比较A、B二组,A组在RAC、TNFo、TGFβ1等方面与B组存在显著差异;免疫组化显示A、C两组均可见BrdU阳性细胞表达,且两组间差异有显著性.结论 给新生大鼠静脉注射MSCs后,MSCs可在肺组织定植,其定植水平与动物暴露的环境有关,并对高氧引致的肺损伤具有保护作用,其机制可能与调控肺部微环境等有关.  相似文献   

9.
静脉注射大鼠骨髓MSCs缓解新生大鼠高氧肺损伤   总被引:1,自引:0,他引:1  
目的:研究大鼠骨髓间充质干细胞(mesenchymal stem cells,MSCs)对高氧新生大鼠肺组织血管内皮生长因子(Vascular endothelial cell growth factor,VEGF)表达的影响.方法:采用贴壁选择法分离、培养、扩增大鼠骨髓来源MSC,并以5-溴脱氧尿嘧啶核苷(5-bromo-2-deoxyuridine,BrdU)进行标记;3日龄清洁级SD新生大鼠32只,随机分为高氧组(A组)、高氧干预组(B组)、正常干预组(C组)、对照组(D组)4组;A、B二组均置大鼠于95%氧环境下7天后,B组每只动物尾静脉注射5×104的MSCs,A组每只注射磷酸盐缓冲液(PBS)50μl;而C、D二组则置于正常空气环境下,同时分别给予每只大鼠尾静脉注射含5×104MSC及PBS 50μl.注射后72 h(13日龄)处死全部动物,肺组织病理学检测辐射状肺泡计数(radical alveolar counts,RAC),免疫组织化学检测VEGF吸光度(A)值、BrdU表达情况.结果:仅二个注射MSC组(B、C组)可见BrdU阳性表达,高氧组RAC值及均显著低于对照组,而给予MSC均可使其明显上升,近于对照组.结论:给新生大鼠静脉注射MSC对高氧肺损伤的保护作用可能与增加肺组织VEGF表达有关.  相似文献   

10.
目的探讨维生素D对支气管肺发育不良的保护作用及其作用机制。方法应用高氧诱导的支气管肺发育不良新生小鼠 模型,将36只幼鼠出生后立即给予实验处理,依据不同处理随机分为4组:空气+维生素D组,空气+生理盐水组,高氧+维生素D 组,高氧+生理盐水组。将各组实验鼠称重后处死,同时抽取心室内血液,采用ELISA方法测定血清维生素D水平。分离肺组织 病理切片制作和组织细胞形态学检查取不同处理组小鼠的肺组织,光镜下观察并分析肺终末呼吸单位的组织形态;用图像分析 软件对辐射状肺泡计数、肺泡次级间隔体积密度,比较不同处理组的肺终末呼吸单位损伤参数;取不同处理组实验小鼠的肺组 织,提取总蛋白,采用Western blot法检测血管内皮生长因子(VEGF)和VEGF-R2水平。结果空气+生理盐水组和空气+维生素 D组的体质量增长速率大于高氧+生理盐水组;空气+生理盐水组和空气+维生素D组的肺组织重量大于高氧+生理盐水组(P< 0.05)。辐射状肺泡计数,高氧+生理盐水组的RAC降低(P<0.001),而高氧+维生素D(1250 倍)组的辐射状肺泡计数升高(P< 0.001),且当稀释倍数降低,高氧+维生素D(125倍)组的辐射状肺泡计数比高氧+维生素D(1250倍)组升高(P>0.01)。与高氧+ 生理盐水组相比,高氧+维生素D(1250倍)组的次级突起计数显著升高(P<0.001),且当稀释倍数降低,高氧+维生素D(125倍) 组的次级突起比高氧+维生素D(1250 倍)组升高(P>0.01)。高氧+生理盐水组的VEGFR2 表达量低于空气+生理盐水组(P< 0.05),空气+维生素D组的VEGFR2表达量低于空气+生理盐水组(P<0.01);高氧+维生素D(1250倍)组的VEGFR2表达量高于 高氧+生理盐水组(P<0.001)和高氧+维生素D(125倍)组(P<0.001),高氧+维生素D(125倍)组的表达量也高于高氧+生理盐水 组(P<0.05)。但是,高氧+维生素D(1250倍)组的VEGFR2表达量高于高氧+生理盐水组与HE染色、辐射状肺泡计数以及次级 突起计数的趋势相反。结论新生小鼠在支气管肺发育不良状态下增加维生素D可增加肺组织重量,为肺成熟提供物质基础, 高浓度维生素D更有助于对肺的保护作用,有助于肺血管的生长。  相似文献   

11.
Objective: To evaluatel the value of D-dimers in patients with acute aortic dissection (AAD). Methods: This study consisted of 16 patients with AAD and 27 non-AAD patients. Serum D-dimets were measured by Sta-Liatest D-DI immunoturbidimetric assay. Results: D-dimer level was higher (P < 0.001) in patients with AAD(7.91 ± 5.52 μg/ml) than that in non- AAD group(1.57±1.24 μg/ml). D-dimer was positive (>0.4 μg/ml) in all patients with AAD and in 10 control group patients (37%). Among patients with acute AAD, D-dimers tended to be higher in Stanford A than in Stanford B (8.67 ± 4.31 μg/ml vs. 3.24±1.27 μg/ml, P <0.01). D-dimer values tended to be higher in more extended disease(3.84 ± 1.65 μg/ml, 8.57 ± 3.58 μg/ml and 11.87 ± 5.69 μg/ml in thoracic aorta, thoracic and abdominal aorta, thoracic and abdominal aorta and iliacal arteries, respectively, P < 0.05 for both 8.57 ± 3.58 and 11.87 ± 5.69 vs. 3.84 ± 1.65 ). Including the control group into the analysis, we found a sensitivity of 100%, a negative predictive value of 100%, and a specificity of 66% and a positive predictive value of 64% for D-dimer in diagnosis of AAD in our patients with suspected AAD. Conclusion: D-dimer was elevated in patients with AAD. A negative D-dimer test result could be useful in excluding AAD.  相似文献   

12.
Objective: To set up a simple and reliable rat model of combined liver-kidney transplantation. Methods: SD rats served as both donors and recipients. 4℃ sodium lactate Ringer's was infused from portal veins to donated livers,and from abdominal aorta to donated kidneys, respectively. Anastomosis of the portal vein and the inferior vena cava (IVC) inferior to the right kidney between the graft and the recipient was performed by a double cuff method, then the superior hepatic vena cava with suture. A patch of donated renal artery was anastomosed to the recipient abdominal aorta. The urethra and bile duct were reconstructed with a simple inside bracket. Results: Among 65 cases of combined liver-kidney transplantation, the success rate in the late 40 cases was 77.5%. The function of the grafted liver and kidney remained normal. Conclusion: This rat model of combined liver-kidney transplantation can be established in common laboratory conditions with high success rate and meet the needs of renal transplantation experiment.  相似文献   

13.
Objective To observe blood pressure change with age in salt-sensitive teenagers whose salt sensitivity were determined by repeated testing.Methods Salt sensitivity was determined through intravenous infusion of normal saline combined with volume-depletion by oral diuretic furosemide in 55 teenagers. After five years, salt sensitivity was re-examined and subject blood pressure was followed up. Blood pressure changes in salt-sensitive teenagers were compared to that of non-salt sensitive teenagers over five years.Results After 5 years, the repetition rate of salt sensitivity determined by intravenous saline loading is 92.7%. In teenagers with salt sensitivity on the baseline, both the systolic blood pressure increments and increment rates were much higher than non-salt sensitive teenagers (12.7±12.1 mmHg vs. 2.8±5.2 mmHg, P< 0.01; 12.2%± 12.0% vs. 2.5% ±4.4%, P< 0.001,respectively). There was a similar trend for diastolic blood pressure (8.4 ± 6.4 mmHg vs. 3.7 ± 6.4 mmHg, P = 0.052; 13.2% ±10.6 % vs. 6.8%± 10.1%, P = 0.053, respectively).Conclusions Salt sensitivity determined by intravenous saline loading showed good reproducibility. Blood pressure increments with age were much higher in salt-sensitive teenagers than non-salt sensitive teenagers, especially in terms of systolic blood pressure.  相似文献   

14.
目的:评价使用安心颗粒对急诊经皮冠状动脉介入术(PPCI)术后生活质量的影响.方法:将160例接受PPCI的急性ST段抬高型心肌梗死患者随机分为安心颗粒组(术前顿服安心颗粒8.8g,术后安心颗粒4.4 g/次,每日2次)和对照组(仅接受基础药物治疗).所有患者均服用阿司匹林、氯吡格雷和阿托伐他汀.分别在入院时、出院前1d、出院后180 d时,应用心肌梗死多维度量表(MIDAS)、中文版SF-36评价量表对患者生活质量评分.并观察术后30 d以内的出血并发症、血小板减少症发生情况.结果:入院时和出院前1d,两组患者的心肌梗死MIDAS、SF-36量表评分比较无差异(P>0.05);出院后180 d时,与对照组比较,安心颗粒组MIDAS、SF-36评分明显减低(P<0.05);组内与入院时比较,两组出院前1d、出院后180 d时,MIDAS、SF-36评分均降低(P<0.05).两组患者在随访期间均无大量出血、少量出血、重度和极重度血小板减少症发生,安心颗粒组有4例、对照组有7例发生不明显出血(P>0.05).两组发生轻度血小板减少症的患者数比较无差异(P>0.05).结论:PPCI使用安心颗粒,能改善急性ST段抬高型心肌梗死患者的生活质量,且不增加出血风险.  相似文献   

15.
Increasing maternal age is the only etiological factor unequivocally linked to Down's syndrome in humans. The occurrence rate of newborns with Down's syndrome is about 1/220 in women over 35 years old. However, the occurrence rate in embryos fertilized in vitro, of the elder woman is unclear. Using FISH we screened the number of chromosome 21 in preimplanted embryos of 5 elderly women (average age, 38.4 years) to study the feasibility and necessity of screening trisomy 21 in embryos in patients over 35 years old at the in vitro fertilization (IVF) center.  相似文献   

16.
Real-time three-dimensional echocardiography (RT3DE)is a new ultrasound technique that enables dynamic threedimensional visualization and quantification of the heart in real time. Investigation of feasibility and methodology of RT3DE in determining left ventricular (LV) and right ventricular (RV) volumes, RT3DE was performed in 35 normal adults using Philips SONOS 7500 system with a 2-4 MHz matrix array transducer. The 60°×60° "pyramid" volume database was obtained and analyzed on a TomTec echo workstation. Both LV and RV volumes were calculated with four 3DE methods (i.e. apical 2, 4, 8, and 16-plane) through manually tracing ventricular endocardial borders in end diastole and end systole. Stroke volumes were then calculated. LV volume was also measured by 2DE Simpson's rule using GE VIVID 7 ultrasound machine.  相似文献   

17.
A clinical guideline for the therapeutic interventions of integrative medicine may be defined as a written document which states a series of recommendations on therapeutic interventions of integrative medicine for a special disease or condition. The guideline may provide assistance to medical professionals in making clinical decisions aimed at improving the clinical outcome of patients and reducing the costs of medical care(~'4~. Recommendations issued by a guideline should be based on the best available evidence in both Western and Chinese medicine. For fulfilling this purpose, the development of clinical guidelines for therapeutic interventions in the field of integrative medicine should follow scientific principles and undergo a rigorous processes.  相似文献   

18.
Objective:To probe into the influence of changes of ovarian hormones on the pathogenesis of the specific sub-type premenstrual syndrome(PMS)and reveal partial microcosmic mechanisms of adverse flow of liver-qi.Methods:Estradiol(E2)and progesterone(P)levels in serum were determined at different phases of menstrual cycle by radioimmunoassay.Results:In the group of PMS with adverse flow of liver-qi.the secretive peak value Of E2 and P at the follicular phase significantly decreased,and the secretive peak value at the luteal phase did not come into being.Conclusions:Low E2 and P secretive peak at the follicular phase and absence of secretive peak at the luteal phase is one of the microcosmic mechanisms of PMS with adverse flow of liver-qi.One of the pathophysiologic mechanisms of specific sub-type PMS is probably the continuous low level of E2and P.  相似文献   

19.
Journal of Nanjing Medical University (English Edition) JNMU, sponsored by Nanjing Medical University, was established in 1987. It is a bimonthly comprehensive English medical journal published locally and abroad.Since 2007, Journal of Nanjing Medical University (English Edition )was granted Elsevier the full publishing and distribution rights worldwide for the Electronic Edition, excluding the People's Republic of China.  相似文献   

20.
Objective:To investigate the influences of urapidil and nicardipine on rabbit sinus function,atrio-ventricular node function and hemodynamics.Methods:Thirty-two Angora's rabbits were selected and randomly divided into four groups.U1 group:urapidil 0.25 mg/kg;U2 group:urapidil 0.5 mg/kg;N1 group:nicardipine 10 μg/kg;N2 group:nicardipine 20 μg/kg.All these medicine were administrated within 30 seconds.Measurements were taken before and after the administration of urapidil or nicardipine for the following data:mean blood pressure(MAP),heart rate(HR),sino-atrial conduction time(SACT),maximal sinoatrial recovery time(SNRTmax)corrected sinus node recovery time(CSNRT),index of sinus node recovery time(SNRTI),Wenckebach A-V conduction frequency (WB),and P-R interval.Results:Significant MAP and HR changes were identified in all of the four groups before and after administration of both urapidil and nicardipine.No significant changes could be found in the rest of the parameters.Intergroup analysis showed that SACT and CSNRT of N1 and N2 groups were shorter than those of the U2 group(P<0.01);the MAP decreased(P<0.01)and the HR increased drastically(P<0.01).Conclusions:Neither urapidil(0.25 mg/kg,0.5 mg/kg)nor nicardipine(10μg/kg,20μg/kg)has any significant influence on rabbit sinus function or rabbit atrio-ventricular node function.Nicardipine could be a better choice than urapidil for parafunctional sinus node patients.  相似文献   

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