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1.
目的:探讨急性心肌缺血对大鼠血流动力学和心电图J点位移的影响,以及通脉刺五加胶囊的干预作用。方法将30只筛选后的大鼠,按照体质量区域化随机分为3组(每组10只),分别为假手术组、模型组和给药组,给药组大鼠每日灌胃给予刺五加胶囊的混悬液3.5ml/kg,假手术组、模型组大鼠每日灌胃相同体积的生理盐水,连续给药14d。结扎大鼠左冠状动脉的前降支,复制大鼠急性心肌缺血的模型,将压力换能器导管自右侧的颈总动脉插入左心室,记录冠状动脉结扎后15min大鼠左心室压力的变化情况。同时,运用多道生理记录仪对大鼠的心电图(ECG)进行监测,分别记录大鼠冠状动脉结扎后0.5,1,2,4和6 h ECG中J点的位移(⊿J),来探讨通脉刺五加胶囊对急性心肌缺血的缓解作用。结果实验结果表明,与假手术组相比,模型组大鼠左心室舒张末期压(LVEDP)显著升高(P<0.05),而左心室收缩峰压(LVSP)和压力最大变化率(±dp/dtmax)则显著降低(P<0.05),且冠状动脉结扎后0.5,1,2,4和6 h ECG中⊿J明显升高(P<0.05)。与模型组相比,给药组大鼠LVEDP明显下降(P<0.05), LVSP和±dp/dtmax明显升高(P<0.05),且除0.5和6h两个时间点外(P>0.05),其余各时间点ECG的⊿J均显著下降(P<0.05)。结论大鼠左冠状动脉前降支结扎后,心肌收缩舒张功能明显减弱,ECG中J点位移明显,通脉刺五加胶囊能明显缓解急性心肌缺血对大鼠心电图造成的影响。  相似文献   

2.
复方血栓通胶囊对心肌缺血犬血流动力学的影响   总被引:2,自引:0,他引:2  
目的:探讨复方血栓通胶囊对心肌缺血犬血流动力学的影响。方法:25只健康杂种犬随机分为5组:对照组,缺血组,地奥心血康组,高剂量和中剂量血栓通组,采用结扎冠状动脉前降支的方法建立犬急性心肌缺血的动物模型,用四道生理记录仪记录犬心脏舒缩期左室内压变化速度和血压的动态变化,并测定心肌缺血后不同时间血中超氧化物歧化酶的活性和丙二醛的含量。  相似文献   

3.
目的 观察缝隙连接阻滞剂16-DSA对离体SD大鼠正常心脏及局部缺血心脏机械功能的影响,探索缝隙连接在维持心脏机械功能的作用.方法 建立离体SD火鼠心脏Langendorff灌流模型(含16-DSA的K-H灌流液);结扎左前降支,建立局部心肌缺血模型;取缺血部分心肌进行免疫荧光染色检测,应用图像分析系统半定量分析细胞间机械连接和缝隙连接的代表蛋白,包括Desmoplakin和缝隙连接蛋白43( Cx43)蛋白的水平.透射电镜观察缺血及16-DSA对心肌结构的影响.结果(1)16-DSA有使正常心脏左心室压最大上升速率(dp/dtmax)和左心室收缩峰压(LVSP)下降的趋势,对左心室舒张末压(LVEDP)无明显影响.局部缺血心脏的LVSP,dp/dtmax明显下降,LVEDP明显上升,16-DSA对缺血心脏的LVSP、dp/dtmax均无明显影响,对LVEDP有改善的趋势.(2)缺血心肌Cx43和Desmoplakin的表达面积比正常心肌明显减少.16-DSA可使缺血所致Cx43的减少发生部分逆转,但对Desmoplakin无明显影响.(3)通过透射电镜可见缺血对心肌细胞有破坏性影响,16-DSA可以减轻该影响.结论 (1)16-DSA可以使正常心脏的收缩功能下降,而对舒张功能无明显影响.(2)16-DSA可以部分逆转缺血对心脏舒张功能的破坏,可能与其部分逆转缺血对Cx43下调有关.但其对心肌机械连接——桥粒无明显影响.(3)16-DSA可以减轻由于缺血造成的心肌损害.  相似文献   

4.
目的观察高血脂大鼠早期血流动力学指标的变化特点,探讨其与心肌缺血性损伤发生的关系。方法采用高胆固醇饲喂,建立高血脂大鼠模型,测定饲喂10~90 d大鼠的血脂、肌钙蛋白和血流动力学各指标,并观察其心肌的病理变化。结果本实验模型主要表现为高胆固醇血症,随高脂饲喂时间延长,高脂组(HC组)较正常对照组(NC组)血流动力学各指标明显下降,饲喂50 d后HC组大鼠出现心肌缺血性损伤,相关分析表明心肌缺血性损伤的发生与高血脂密切相关。结论高胆固醇血症早期可改变血流动力学相关指标,诱导心肌缺血性损伤的发生,提示可能存在心肌微循环功能障碍。  相似文献   

5.
目的:观察大鼠心肌缺血再灌注损伤过程中血流动力学及炎症因子的表达变化。方法将30只健康雄性SD大鼠随机分为A、B组各15只,A组采用结扎左冠状动脉前降支30 min进行再灌注120 min的方法制备心肌缺血再灌注模型,B组仅在左冠状动脉前降支下穿线。于缺血前即刻、缺血30 min及再灌注30、60、120 min时记录心率( HR)和平均血压( MAP),并计算心肌氧耗指数( RPP);分别于以上时点采血,ELISA法测定各组血清IL-1、IL-6、TNF-α;最后处死取心肌组织,观察其病理变化。结果与B组比较,A组同时点MAP和RPP降低,心肌组织及缺血再灌注各时点血清IL-1、IL-6、TNF-α水平均升高(P均<0.05);HE染色示,A组大鼠心肌组织结构紊乱,细胞核不规则,可见炎性细胞浸润。结论大鼠心肌缺血再灌注损伤早期血流动力学即产生变化,全身和心肌组织局部的炎症因子表达明显升高。  相似文献   

6.
目的:探讨复方血栓通胶囊对心肌缺血犬血流动力学的影响。方法:25 只健康杂种犬随机分为5 组:对照组、缺血组、地奥心血康组、高剂量和中剂量血栓通组,采用结扎冠状动脉前降支的方法建立犬急性心肌缺血的动物模型,用四道生理记录仪记录犬心脏舒缩期左室内压变化速率(+ dp/dtm ax ,- dp/dtm ax )和血压的动态变化,并测定心肌缺血后不同时间血中超氧化物歧化酶( S O D)的活性和丙二醛( M D A)的含量。结果:用药组犬在心肌缺血后,其+ dp/dtm ax 和- dp/dtm ax 下降幅度小于缺血组( P< 0.05),而且收缩压与舒张压的下降幅度也小于缺血组( P<0.05),血栓通与地奥心血康组及对照组无显著性差异( P> 0.05)。用药组血浆 S O D活性高于缺血组, M D A 含量低于缺血组,而用药组之间则无显著性差异。结论:血栓通胶囊具有改善心脏功能,升高血压的功效;这可能与提高心肌缺血犬的 S O D 活性,抑制脂质过氧化,清除自由基的作用有关。  相似文献   

7.
一氧化氮对肝硬化大鼠血流动力学的影响   总被引:6,自引:0,他引:6  
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8.
目的:研究马兜铃酸I(Aristolochic acid I,AAI)静脉给药后短期内对大鼠肾血流动力学指标的影响。方法:大鼠麻醉后,静脉给予不同浓度(1.0mg/kg,5.0mg/kg,25.0mg/kg)的AAI,采用生理压力记录仪记录血压变化,采用对氨基马脲酸清除率法观察有效肾血浆流量(RPF)变化,采用菊糖清除率法观察肾小球滤过率(GFR)变化,根据上述指标计算肾血管阻力值(RVR)变化。结果:(1)大鼠平均动脉压未见明显变化,而大鼠尿量显著增加(P<0.01),且三组尿量上升幅度相近,均为给药前的3倍左右。(2)大鼠RPF与给药前相比显著上升(P<0.01),其中以25.0mg/kg组最为明显。(3)大鼠GFR有上升趋势,其中5.0mg/kg组和25.0mg/kg组给药前后GFR差异显著(P<0.05)。(4)大鼠RVR显著下降(P<0.01),以25.0mg/kg组下降最为明显。结论:AAI在给药后的短期内具有减少RVR、增加RPF、GFR率和尿量的作用。AAI不具有引起肾组织一过性缺血从而加重肾组织损伤的能力。  相似文献   

9.
目的 观察MS23对麻醉正常血压大鼠血流动力学和对清醒无拘束自发性高血压大鼠(SHR)血压的影响.方法 采用PowerLab系统记录MS23对麻醉正常血压大鼠的血压、心电和血流动力学指标的影响;采用DSI心电和血压遥测系统观察MS23对清醒无拘束自发性高血压大鼠血压的影响.结果 MS23 0.1mg/kg~1.0mg/kg 静脉给药降低麻醉正常血压大鼠的平均动脉压、左心室收缩压和左心室压最大上升速率,减慢心率,对左心室舒张末压、左心室压最大下降速率和心电图其他指标无统计学意义;而Ami降低收缩压的同时,增快心率、增大左心室收缩压和左心室压最大上升速率.MS23 1.0 mg/kg 灌胃给药对清醒无拘束自发性高血压大鼠的收缩压和舒张压均有显著的降低作用,且以对舒张压的作用更明显;对心率无显著性影响.结论 MS23对正常血压大鼠和自发性高血压大鼠的血压均有显著的降低作用,而对心脏无兴奋作用.  相似文献   

10.
神经肽Y对肝硬化大鼠血流动力学及水钠代谢的影响   总被引:2,自引:0,他引:2  
近年来,人们发现神经肽Y(NPY)与肝脏疾病有密切关系[1,2]。正常肝组织中NPY阳性神经纤维分布于门脉系统周围,在肝小叶中NPY阳性神经纤维沿肝窦状隙行走,肝硬化时肝纤维化间隔中NPY神经纤维显著增多,说明NPY神经纤维的改变与肝硬化时病理生理变化有关[2]。本实验测定了肝硬化大鼠血浆和组织中NPY的含量,并对其含量变化及对血流动力学和水钠代谢的影响进行了探讨。 1.材料与方迭:(1)动物分组及肝硬化模型的建立:健康雄性SD大鼠随机分为肝硬化组和假手术组,肝硬化组采用胆管结扎的方活建立模型。…  相似文献   

11.
目的 观察黄瓜香(VDG)对大鼠急性心肌缺血的保护作用.方法 建立异丙肾上腺素(ISO)致急性心肌缺血模型,测定大鼠Ⅱ导联心电图变化,采用TTC染色法测定心肌梗死区,分光光度计测定血清肌酸激酶(CK)和乳酸脱氢酶(LDH)含量,计算心肌含水量(MWC)及心肌指数(MI).结果 黄瓜香可降低异丙肾上腺素引起的急性心肌缺血模型大鼠的血清CK、LDH活力,MI及MWC分别降低29.3%和10.8%,减小心肌梗死范围16.0%(P<0.05).结论 黄瓜香对大鼠急性心肌缺血具有一定的保护作用.  相似文献   

12.
目的探讨糖尿病急性心肌缺血对心肌新生血管生成的影响及其机制。方法清洁级健康雄性8周龄sD大鼠52只,任意选取其中20只以高脂喂养联合小剂量链脲佐菌素建立糖尿病大鼠模型;以糖尿病建模成功的大鼠与16只正常大鼠以结扎冠状动脉前降支制作急性心肌梗死模型;另外16只大鼠只开胸不造模、不给药作为假手术组。心肌梗死造模术后2周,处死各组动物,取左心室梗死区及相邻区域心肌,采用免疫组化方法检测各组大鼠缺血周边区微血管密度(MVD),Western blotting法检测血管内皮生长因子(VEGF)及其信号转导蛋白[磷酸化蛋白激酶B(p-Akt)、内皮型一氧化氮合酶(eNOS)、磷酸化eNOS(p-eNOS)]、内皮抑素蛋白的表达。组间数据比较采用单因素方差分析,样本均数间两两比较采用q检验,两组计量资料比较采用t检验。结果3组成活大鼠分别为:糖尿病心肌梗死组12只,非糖尿病心肌梗死组(对照组)13只,假手术组14只。与对照组相比,糖尿病组缺血心肌新生血管明显减少(19.7±3.8比14.2±3.6,q=2.98,P〈0.05)。糖尿病组、假手术组VEGF表达显著低于对照组(分别为0.89±0.12、0.65±0.23和1.53±0.20,F=6.52,P〈0.01)。糖尿病组和对照组p-Akt和eNOS蛋白表达差异无统计学意义(t值分别为3.02、2.78,P〉0.05),但糖尿病组p-eNOS蛋白表达显著减少(0.49±0.09比1.16±0.12,t=5.68,P〈0.05)。糖尿病组内皮抑素表达显著高于对照组(4.6±0.6比2.3±0.4,t=8.63,P〈0.05)。结论糖尿病大鼠急性缺血心肌的新生血管生成低下,VEGF转导通路在多个水平上参与其中,并与内皮抑素共同作用。  相似文献   

13.
目的研究卡维地洛(Carvedilol)对大鼠急性心肌梗死(AMI)后血流动力学的影响及其与心肌组织中胶原含量的关系。方法23只AMI术后存活的雄性SD大鼠随机分为AMI对照组(n=11)和卡维地洛治疗(Carvedilol)组(n=12),另设假手术组(n=11)。给药6周后测量室间隔超声背向散射参数(平均背向散射积分标化值IBS%,背向散射积分周期变化值CVIB)及血流动力学参数、心功能指标。结果(1)与假手术组相比,AMI组大鼠SBP、DBP、LVSP及±dp/dtmax及其校正值(±dp/dtmax/LVSP)均显著降低,LVEDP显著增高,高频超声检测显示IBS%显著升高,CVIB显著降低(均为P<0.05)。(2)与AMI组相比,Carvedilol治疗组大鼠SBP、DBP及LVSP均未进一步降低(P>0.05),LVEDP显著降低,±dp/dtmax及其校正值(±dp/dtmax/LVSP)显著升高,高频超声检测显示IBS%显著降低,CVIB显著升高(均P<0.05)。结论第3代β受体阻滞剂Carvedilol的干预有助于恢复AMI大鼠受损的左室功能,这可能与其抑制非梗死区心肌胶原过度沉积有关。  相似文献   

14.
目的观察尼可地尔对大鼠实验性心肌梗死的影响。方法Wistar大鼠100只,随机分为5组:尼可地尔低剂量组、中剂量组、高剂量组、假手术组和对照组。麻醉大鼠,结扎左冠状动脉前降支60 min,再灌注60 min,从心肌梗死面积(MIS)、血清酶学、丙二醛(MDA)、超氧化物歧化酶(SOD)活性的变化观察尼可地尔的抗心肌缺血再灌注损伤作用。结果尼可地尔可降低心肌梗死面积,降低血清肌酸磷酸激酶(CK)和乳酸脱氢酶(LDH)活性,提高心肌SOD活性,减少心肌MDA含量。结论尼可地尔可降低心肌梗死面积,对急性缺血心肌有保护作用。  相似文献   

15.
目的:探讨腹腔预注射全氟化碳(PFC)对大鼠缺血心肌的可能保护作用及机制.方法:将50只Wistar雄鼠随机平均分为5组,假手术组、缺血组、PFC低剂量组、中剂量组、高剂量组,采用结扎冠状动脉前降支造成大鼠心肌缺血损伤模型.用ELISA方法检测缺血20 min、40 min及60 min时大鼠外周血中白细胞介素-6(I...  相似文献   

16.
目的:研究比较卡维地洛与美托洛尔对大鼠心肌梗塞后血流动力学的影响。方法:结扎大鼠左冠状动脉建立急性心肌梗塞模型,术后24 h存活的147只SD大鼠以简单随机法分为心肌梗塞对照组(MI组,n=43),美托洛尔(20mg/kg.d)治疗组(M组,n=42),卡维地洛(10 mg/kg.d)治疗组(C组,n=42),另设假手术组(S组,n=20);各组按观察时点48 h和4周,再分为:MI组48 h和MI组4周,M组48 h和M组4周,C组48 h和C组4周,S组48 h和S组4周。M组、C组于术后24h直接灌胃法给药,并于术后48h及4周对相应的观察组进行血流动力学测定。结果:(1)与S 48h组相比,MI 48h组的主动脉收缩压(SBP)、舒张压(DBP)和平均压(MAP)、左心室收缩压(LVSP)和左心室内压最大上升和下降速率(±dp/dt)均显著降低(P<0.05~<0.01);(2)与S 4周组比较,MI 4周组心率、LVSP和±dp/dt显著降低(P<0.05~<0.01),左室舒张末压(LVEDP)则显著升高(P<0.01),而主动脉SBP、DBP和MAP无显著变化;(3)与MI 48h组相比,C48h组的SBP、MAP、LVSP、±dp/dt和心率均显著降低(P<0.05~<0.01),LVEDP无显著变化,而M 48h组血流动力学指标均无显著差异;(4)与MI 4周组相比,C4周组SBP、DBP、MAP和LVEDP均显著降低(P<0.05),LVSP、±dp/dt等无显著变化;而M 4周组只有LVEDP和心率显著降低(P<0.01)。结论:大鼠心肌梗塞后,可以发生血流动力学异常改变和左室功能异常。较长时间(4周)卡维地洛应用能有效降低AMI后大鼠左室舒张末压,改善血流动力学和左室功能,美托洛尔亦有相似作用。  相似文献   

17.
INTRODUCTION: Cardiac mitochondria, as the major source of energy used by the heart, play an important part in the survival of cardiomyocytes undergoing ischemia followed by reperfusion. During ischemia, cardiac mitochondria represent one of the main cellular defense mechanisms, acting as a calcium-sequestering system and maintaining levels of energy production. However, when these cellular mechanisms are overcome, loss of mitochondrial integrity leads not only to the breakdown of energy production, but also to the release of pro-apoptotic factors, thus compromising the survival of cardiac cells. OBJECTIVES: To study the impact of acute ischemia-reperfusion (IR) on myocardial mitochondrial function in an ex-vivo model of global ischemia. METHODS: Wistar rat hearts were divided into two groups: control (165 minutes of perfusion with Krebs-Henseleit solution) and ischemia-reperfusion (IR - 10 minutes perfusion, followed by 35 minutes ischemia and 120 minutes reperfusion). Various parameters of mitochondrial function were assessed: respiratory control ratio (RCR) using a Clark-type oxygen electrode, oxidative stress (using the thiobarbituric acid reactive substances [TBARS] test), and mitochondrial swelling amplitude and calcium uptake, both determined by fluorimetric methods. RESULTS: All mitochondrial parameters were severely affected by IR. The IR group showed a significant decrease in RCR, which was independent of the respiratory substrate used, for each assay. There were no significant differences between the two experimental groups in TBARS production. The control group showed a trend for a decrease in mitochondrial swelling amplitude and an increase in calcium uptake compared to the IR group, in both the absence and presence of cyclosporin A. CONCLUSIONS: In this study, IR significantly altered mitochondrial function (RCR, mitochondrial swelling amplitude and intramitochondrial calcium uptake). This means that during acute myocardial ischemia, every effort should be made to avoid reperfusion injury, given its deleterious consequences for coronary artery disease patients.  相似文献   

18.
BACKGROUND: Aim of the study was to evaluate the prognostic and decision making value of Holter detected myocardial ischemia after acute myocardial infarction in comparison with clinically detected postinfarction angina and exercise test. METHODS: To this aim the patients consecutively admitted to our coronary care unit with acute myocardial infarction during one year were retrospectively evaluated. One hundred and eighty-nine patients (age 70+/-11 years, 137 male and 51 female) had a 24 hour Holter monitoring. One-year follow up of these patients was obtained. RESULTS: Myocardial ischemia was detected by Holter monitoring in 21 patients (11%), 4 with and 17 without angina. Symptom limited exercise test was obtained before discharge in 116 patients (62%): 45% were positive, 42% non-diagnostic and 13 negative for myocardial ischemia. Post infarction angina was present in 15 patients (9%). Patients with Holter detected myocardial ischemia were older (73+/-10 vs 66+/-11 years, p<0.05) and had higher prevalence of both angina and positive exercise test (p<0.01). One-year follow up was obtained in 186 patients. Holter detected myocardial ischemia positive predictive value for death or reinfarction was 15%, negative predictive value was 90%, similar to the absence of angina (90%) and the absence of positive exercise test (93%). Angina and exercise test identified 62% of patients with Holter detected myocardial ischemia. Residual myocardial ischemia was exclusively observed by Holter monitoring in 4% of the population, particularly in 1 patients with and 7 without exercise test. CONCLUSIONS: The additive contribution of Holter detected myocardial ischemia in the prognosis and decision making of post infarction patients is rather scanty.  相似文献   

19.
AIM: To observe the effect of electroacupuncture (EA) of "Neiguan" (PC6) and "Gongsun" (SP4) on pathological changes of the heart and stomach in rats with acute myocardial ischemia (AMI), and to explore its underlying mechanism. METHODS: Fifty Wistar rats were randomized into control, model, PC6, SP4 and PC6 + SP4 groups (n = 8 each group). An AMI model was established by occlusion of the descending anterior branch (DAB) of the left coronary artery. ECG-ST of cervico-thoracic lead and electrogastrogram (EGG) were recorded. EA was applied to PC6, SP4 and PC6 + SP4 groups, respectively. At the end of experiments, the rats were transcardicalty perfused with 4% paraformaldehyde, and the heart base myocardium, gastric antrum and duodenum tissues were sampled, sectioned and stained with a reduced form of nicotinamideadenine dinucleotide phosphate (NADPH)-diaphorase histochemical method for displaying nitric oxide synthase (NOS) activity. RESULTS: After AMI, ECG-ST values elevated. After EA, the elevated ECG-ST values at 20 min in PC6group, at 30 min in PC6 + SP4 and SP4 groups had no significant differences in comparison with their respective basal values before AMI. Following AMI, the amplitude and frequency of slow waves of EGG decreased remarkably (P 〈 0.05). At 30 min after EA, the mean amplitude and frequency of slow waves of EGG in the three EA groups had no marked differences compared with their individual basal levels and those in the control group. After AMI, the mean integral grey values of NOS-positive product in myocardium, gastric antrum and duodenum tissues in the model group increased remarkably in comparison with the control group, while those in three EA groups were lower than those in the model group. No significant differences were found in ECG-ST and EGG improvement among the three EA groups. However, EA of PC6 had a better effect on ECG-ST and EA of PC4 had a better effect on EGG, respectively. CONCLUSION: EA of PC6, SP4 and PC6 + SP  相似文献   

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