A New Method for Evaluating Regional Cerebral Blood Flow Changes:Laser Speckle Contrast Imaging in a C57BL/6J Mouse Model of Photothrombotic Ischemia

The present study aimed to improve the processing of data acquired from laser speckle contrast imaging（LSCI） to provide a standardization method to explore changes in regional cerebral blood flow（r CBF） and to determine the correlations among r CBF, cerebral ischemic lesion volume and microvascular density over time in a focal ischemic region. C57BL/6J mice were subjected to focal photothrombotic（PT） ischemia. r CBF was measured using LSCI at different time points before and after PT ischemia through an intact skull. Standardized r CBF（Sr CBF）, defined as the ratio of r CBF measured in the ipsilateral region of interest（ROI） to that in the corresponding contralateral region, was calculated to evaluate potential changes. In addition, the volume of the ischemic lesion and the microvascular density were determined using Nissl staining and immunofluorescence, respectively. The relationships among the ischemic lesion volume, microvascular density and Sr CBF were analyzed over time. The results showed that the cortical r CBF measured using LSCI following PT ischemia in the C57BL/6J mice gradually increased. Changes in the cerebral ischemic lesion volume were negatively correlated with Sr CBF in the ischemic region. Changes in the microvascular density were similar to those observed in Sr CBF. Our findings indicate that LSCI is a practical technique for observing changes in murine cortical r CBF without skull opening and for analyzing the relationships among the ischemic lesion volume, microvascular density and Sr CBF following focal cerebral ischemia. Preliminary results also suggest that the use of LSCI to observe the formation of collateral circulation is feasible.

REAL-TIME MONITORING OF MITOCHONDRIAL FUNCTION AND CEREBRAL BLOOD FLOW FOLLOWING FOCAL ISCHEMIA IN RATS

Focal ischemia due to reduction of cerebral blood flow(CBF),creates 2 zones of damage:the core area,which suffers severe damage,and penumbra area,which surrounds the core and suffers intermediate levels of injury.Objectives:A novel method is introduced,which evaluates mitochondrial function in the core and in the penumbra,during focal cerebral ischemia.Methods:Wistar rats underwent focal cerebral ischemia by middle cerebral artery occlusion(MCAO)for 60 minutes,followed by 60 minutes of reperfusion.Mitochondrial function was assessed by a unique Multi-Site—Multi-Parametric(MSMP)monitoring system,which measures mitochondrial NADH using fluorometric technique,and CBF using Laser Doppler Flowmetry(LDF).Results:At the onset of occlusion,CBF dropped and NADH increased significantly only in the right hemisphere.CBF levels were significantly lower and NADH significantly higher in the core than in the penumbra.After reperfusion,CBF and NADH recovered correspondingly to the intensity of ischemia.Conclusion:Application of the MSMP system can add significant information for the understanding of the cerebral metabolic state under ischemic conditions,with an emphasis on mitochondrial function.

Enhancing hippocampal blood flow after cerebral ischemia and vasodilating basilar arteries:in vivo and in vitro neuroprotective effect of antihypertensive DDPH

1-（2,6-Dimethylphenoxy）-2-（3,4-dimethoxyphenylethylamino）-propane hydrochloride （DDPH） is a novel antihypertensive agent based on structural characteristics of mexiletine and verapamine. We investigated the effect of DDPH on vasodilatation and neuroprotection in a rat model of cerebral ischemiain vivo, and a rabbit model of isolated basilar arteriesin vitro. Our results show that DDPH （10 mg/kg） significantly increased hippocampal blood flowin vivo in cerebral ischemic rats, and exerted dose-dependent relaxation of isolated basilar arteries contracted by histamine or KCl in thein vitro rabbit model. DDPH （3 × 10–5 M） also inhibited histamine-stimulated extracellular calcium inlfux and intracellular calcium release. Our ifndings suggest that DDPH has a vasodilative effect bothin vivo andin vitro, which mediates a neuropro-tective effect on ischemic nerve tissue.

Effects of electroacupuncture on microcirculatory blood flow and glucose transporter function in the hippocampus

Nerve cell metabolism in post brain ischemia depends on increased microcirculation perfusion and transport function of microvascular endothelial cells. In the present study, a rat model of middle cerebral artery occlusion was established to investigate the influence of electroacupuncture （EA） on hippocampal CA1 cerebral blood flow and glucose transporter 1 （GLUT1） expression in the microvascular endothelial cells. Following EA at Neiguan （PC 6）, the cerebral blood flow in the ischemic hippocampal CA1 region was significantly elevated, the number and microvascular integrated absorbance of the GLUTl-positive cells were significantly increased, nerve cell damage was ameliorated, and GLUT1 protein expression in the ischemic hippocampus was significantly increased. Results demonstrate that EA increased the cerebral blood flow of the hippocampal CA1 region and improved the glucose transport function, thereby attenuating neuronal injuries.

NADPH oxidase 2 does not contribute to early reperfusion-associated reactive oxygen species generation following transient focal cerebral ischemia

Excess production of reactive oxygen species （ROS） critically contributes to occurrence of reperfusion injury, the paradoxical response of ischemic brain tissue to restoration of cerebral blood flow. However, the enzymatic sources of ROS generation remain to be unclear. This study examined Nox2-ontaining NADPH oxidase （Nox2） expression and its activity in ischemic brain tissue following post-ischemic reperfusion to clarify the mechanism of enzymatic reaction of ROS. Male Sprague-Dawley rats were subjected to 90-minute middle cerebral artery occlusion, followed by 3 or 22.5 hours of reperfusion. Quantitative reverse transcriptase PCR and western blot assay were performed to measure mRNA and protein expression of Nox2. Lucigenin fluorescence assays were performed to assess Nox activity. Our data showed that Nox2 mRNA and protein expression levels were significantly increased （3.7-fold for mRNA and 3.6-fold for protein） in ischemic brain tissue at 22.5 hours but not at 3 hours following post-ischemic reperfusion. Similar results were obtained for the changes of NADPH oxidase activity in ischemic cerebral tissue at the two reperfusion time points. Our results suggest that Nox2 may not contribute to the early burst of reperfusion-related ROS generation, but is rather an important source of ROS generation during prolonged reperfusion.

急性缺血性脑卒中患者溶栓后脑血流量与缺血再灌注损伤及神经功能的相关性研究

目的 探讨急性缺血性脑卒中(acute ischemic stroke, AIS)患者溶栓后脑血流与缺血再灌注损伤及神经功能的相关性。方法 回顾性选取2021年2月至2024年2月唐山市工人医院神经内科收治的AIS患者150例,根据溶栓后CT灌注成像检查患侧脑血流量(cerebral blood flow, CBF)变化情况分为高灌注组48例和低灌注组102例。获取出血转化情况及灌注参数资料,后者包括CBF、脑血容量(cerebral blood volume, CBV)、残余功能达峰时间(time to maximum of the residual function, T_(max))、平均通过时间(mean transit time, MTT)和达峰时间(time to peak, TTP),以及相对值rCBF、rCBV、T_(r, max)、rMTT及rTTP。比较2组一般临床资料、氧化应激、美国国立卫生研究院卒中量表(National Institutes of Health Stroke Scale, NIHSS)评分和炎性因子水平。采用Pearson/Spearman相关性分析AIS患者溶栓后rCBF与氧化应激、炎性因子、出血转化情况及NIHSS评分的相关性。结果 低灌注组患侧MTT、T_(max)、TTP显著高于健侧,CBF显著低于健侧,差异有统计学意义(P<0.01)。高灌注组患侧MTT、TTP显著低于健侧,CBF、CBV显著高于健侧,差异有统计学意义(P<0.01)。低灌注组rMTT、T_(r, max)、rTTP显著高于高灌注组,rCBF、rCBV显著低于高灌注组(P<0.01)。低灌注组丙二醛、晚期氧化蛋白产物、肿瘤坏死因子α、C反应蛋白水平显著低于高灌注组,超氧化物歧化酶水平显著高于高灌注组,差异有统计学意义(P<0.05,P<0.01)。Pearson相关性分析显示,rCBF与丙二醛、肿瘤坏死因子α呈负相关(r=-0.436,P<0.01;r=-0.451,P<0.01),与超氧化物歧化酶呈正相关(r=0.412,P<0.01)。结论 AIS患者溶栓后脑血流变化与缺血再灌注损伤存在较好相关性,但与神经功能恢复情况不具备显著相关性。

补阳还五汤改善脑缺血大鼠血流灌注的多模态磁共振成像研究

目的利用多模态磁共振成像(magnetic resonance imaging,MRI)技术纵向观察补阳还五汤对脑缺血大鼠侧支循环及血流灌注的影响。方法采用线栓法建立永久性中动脉栓塞致脑缺血大鼠模型。将造模成功的24只大鼠随机分为模型组、补阳还五汤高剂量组(16.6 g/kg)、补阳还五汤低剂量组(8.3 g/kg),每组8只,以及假手术组(8只),共分4组。各给药组大鼠在造模后24小时灌胃给药,连续给药15天。假手术组和模型组大鼠给予等量生理盐水。分别在给药后第7天和15天进行多模态MRI扫描。利用T2加权成像检测脑梗死体积,磁共振血管成像检测颅内动脉信号,动脉自旋标记检测缺血边缘血流灌注。结果与假手术组大鼠比较,缺血7天和15天后,模型组大鼠缺血侧前动脉(anterior cerebral artery,ACA)、颈内动脉(internal carotid artery,ICA)、后动脉(posterior cerebral artery,PCA)血管信号强度显著降低(P<0.05,P<0.001),基底动脉(basilar artery,BA)信号强度显著升高(P<0.001),缺血边缘血流灌注明显降低(P<0.001)。与模型组比较,补阳还五汤高、低剂量治疗均可明显减少缺血7天后脑梗死体积(P<0.05),降低缺血7天和15天BA信号强度(P<0.05,P<0.01),并升高缺血15天后缺血边缘的血流灌注(P<0.001)。此外,补阳还五汤高剂量治疗还可以降低缺血15天后脑梗死体积(P<0.01),并升高ACA及ICA信号强度(P<0.05);补阳还五汤低剂量还可以升高缺血7天后缺血边缘的血流灌注(P<0.05)。结论补阳还五汤可促进颅内关键动脉侧支循环建立,改善脑血流灌注,降低脑梗死体积,保护脑组织。

依达拉奉右莰醇联合阿替普酶溶栓对急性脑梗死患者脑血流灌注与氧化应激及神经功能的影响

目的 观察依达拉奉右莰醇联合阿替普酶溶栓对急性脑梗死患者脑血流灌注与氧化应激及神经功能的影响。方法 以随机数字表法将2019年8月—2022年12月泉州德诚医院收治的急性脑梗死患者63例进行分组,分为阿替普酶组(31例)和联合溶栓组(32例)。阿替普酶组给予阿替普酶静脉溶栓治疗,联合溶栓组在阿替普酶组基础上予依达拉奉右莰醇治疗,2组均持续治疗14 d。比较2组治疗前后脑血流灌注情况、氧化应激指标[血清谷胱甘肽过氧化物酶(GSH-Px)、丙二醛(MDA)、超氧化物歧化酶(SOD)]、神经功能指标[血清神经元特异性烯醇化酶(NSE)、中枢神经特异蛋白(S100-β)],不良反应。结果 治疗14 d后,2组收缩期血流速度、平均血流速度、脑血管储备功能较治疗前升高,搏动指数较治疗前下降,且联合溶栓组升高/下降幅度大于阿替普酶组(P均<0.01);2组血清GSH-Px、SOD水平升高,血清MDA、NSE、S100-β水平降低,且联合溶栓组升高/降低幅度大于阿替普酶组(P<0.05或P<0.01)。联合溶栓组不良反应总发生率为15.64%,与阿替普酶组的19.35%比较,差异无统计学意义(χ^(2)=0.152,P=0.697)。结论 依达拉奉右莰醇联合阿替普酶溶栓治疗急性脑梗死患者具有良好疗效,有利于增强脑部血液供应,缓解机体氧化应激反应,改善神经功能,且不良反应较少,安全性高。

Use of acupuncture to treat cerebral infarction in the last 10 years A Scopus-based literature analysis

OBJECTIVE： To identify global research trends in the use of acupuncture to treat cerebral infarction. DATA RETRIEVAL： We performed a bibliometric analysis of studies on the use of acupuncture to treat cerebral infarction published during 2002-2011, retrieved from Scopus, using the key words of acupuncture and cerebral infarction or ischemic stroke. SELECTION CRITERIA： Inclusion criteria： peer-reviewed articles on the use of acupuncture to treat cerebral infarction indexed in Scopus and published between 2002 and 2011; types of publications were original research articles, reviews, meeting abstracts, proceedings papers, book chapters, editorial material, and news items. Exclusion criteria： articles that required manual searching or telephone access; documents that were not published in the public domain; and corrected papers. MAIN OUTCOME MEASURES： （a） Annual publication output; （b） language of publication; （c） type of publication; （d） key words of publication; （e） publication by research field; （f） publication by journal （g） publication by country and institution; （h） publication by author; （i） most-cited papers between 2002 and 2006; and （j） most-cited papers between 2007 and 2011. RESULTS： A total of 160 publications on the use of acupuncture to treat cerebral infarction from 2002-2011 were retrieved from Scopus. The number of publications increased gradually over the 10-year study period; most were written in Chinese or English. Articles and reviews constituted the major types. The most frequent key word used was acupuncture. The most prolific journals in this area were Zhongguo 7hen Jiu and the Chinese Journal of Clinical Rehabilitation. Of the 160 publications retrieved, half came from Chinese authors and institutions. Tianjin University of Traditional Chinese Medicine was the most prolific research institute. Two papers were cited 30 times; they were published in 2002 and 2009, respectively. CONCLUSION： In the field of neuroscience, there is little literature on acupuncture for cerebral infarction. The most-cited papers were cited 30 times in the past 3 years. We believe that, with advances in the study of mechanisms in neurobiology, research on acupuncture will also advance and will become the concern of more scholars.

Transcranial focused ultrasound stimulation reduces vasogenic edema after middle cerebral artery occlusion in mice

Blood-brain barrier(BBB)disruption underlies the vasogenic edema and neuronal cell death induced by acute ischemic stroke.Reducing this disruption has therapeutic potential.Transcranial focused ultrasound stimulation has shown neuromodulatory and neuroprotective effects in various brain diseases including ischemic stroke.Ultrasound stimulation can reduce inflammation and promote angiogenesis and neural circuit remodeling.However,its effect on the BBB in the acute phase of ischemic stroke is unknown.In this study of mice subjected to middle cerebral artery occlusion for 90 minutes,low-intensity low-frequency(0.5 MHz)transcranial focused ultrasound stimulation was applied 2,4,and 8 hours after occlusion.Ultrasound stimulation reduced edema volume,improved neurobehavioral outcomes,improved BBB integrity(enhanced tight junction protein ZO-1 expression and reduced IgG leakage),and reduced secretion of the inflammatory factors tumor necrosis factor-αand activation of matrix metalloproteinase-9 in the ischemic brain.Our results show that low-intensity ultrasound stimulation attenuated BBB disruption and edema formation,which suggests it may have therapeutic use in ischemic brain disease as a protector of BBB integrity.

三维动脉自旋标记在足月新生儿缺氧缺血性脑病的早期诊断和预后分组中的价值

目的探讨三维动脉自旋标记(three-dimensional arterial spin labeling,3D ASL)灌注成像与扩散加权成像(diffusion-weighted imaging,DWI)序列对足月新生儿缺氧缺血性脑病(hypoxic ischemic encephalopathy,HIE)的早期诊断价值以及对患者预后分组的价值。材料与方法回顾性分析2017年12月至2022年5月在我院临床诊断为HIE的足月新生儿共40例和对照组40例的资料,全部于出生3天内接受MRI检查。所有HIE患儿出生1个月后进行新生儿行为神经学评估(Neonatal Behavioral Neurological Assessment,NBNA),根据评分将患儿分为预后良好组和预后不良组,所有受试者同时进行3D ASL和DWI检查,比较脑组织各感兴趣区的脑血流(cerebral blood flow,CBF)和表观扩散系数(apparent diffusion coefficient,ADC),感兴趣区包括双侧基底节、丘脑和额叶深部白质,最终取双侧平均值。研究HIE患儿不同脑区的CBF值与NBNA的相关性以及CBF值的早期变化与HIE患儿预后分组的关系。结果(1)预后不良组基底节和丘脑的CBF值高于预后良好组,差异有统计学意义(P<0.001);(2)丘脑CBF值的受试者工作特征(receiver operating characteristic,ROC)曲线下面积为0.973,敏感度和特异度为97.5%、90.2%;ADC值的ROC曲线下面积为0.881,敏感度和特异度为82.5%、92.7%;(3)基底节区及丘脑的CBF值与NBNA评分高度相关(r=-0.8196,P<0.001;r=-0.8504,P<0.001)。结论足月新生儿出生后3天内的3D ASL结果与NBNA评分高度相关,可以早期诊断并预测患儿短期预后,以改善HIE患儿的整体预后效果,为临床治疗方案的选择提供参考依据。

大豆异黄酮可减轻大鼠脑缺血/再灌注损伤:基于抑制铁死亡及炎症级联反应

目的基于大豆异黄酮(SI)对区域脑血流(rCBF)、铁死亡、炎症反应和血脑屏障(BBB)通透性的级联调控作用,探讨SI抗脑缺血/再灌注损伤机制。方法将120只雄性SD大鼠随机分为假手术组(Sham组)、缺血/再灌注组(I/R组)和大豆异黄酮预处理组(SI组),40只/组。采用改良线栓法合并激光多普勒血流仪(LDF)建立大鼠局灶性脑缺血/再灌注损伤模型。术中各组大鼠通过LDF实时监测脑皮层血流动态变化;术后通过光镜和透射电镜观察脑组织病理形态、神经元和BBB超微结构变化,评估神经缺损程度,量化脑梗死、脑水肿和BBB破坏程度,分光光度法检测缺血半暗带Fe^(2+)、谷胱甘肽(GSH)、丙二醛(MDA)、髓过氧化物酶(MPO)含量,ELISA法测定血清TNF-α和IL-1β活性,Western blot法和IHC法检测病灶周围GPX4、MMP-9和Occludin表达。结果插线成功后I/R组和SI组大鼠rCBF均呈现骤降趋势,而拔线后I/R组rCBF上升慢于SI组;rCBF存在插线后不稳定和拔线后未复流状况。I/R组神经细胞固缩严重,线粒体变小、膜密度增加、嵴减少,紧密连接松散、基底膜厚薄不均,SI组各结构损伤相较于I/R组呈不同程度减轻。与Sham组相比,I/R组神经缺损评分、脑梗死体积、脑含水量和伊文思蓝渗透量明显增加(P<0.01),Fe^(2+)和MDA含量增多、GSH含量及GPX4表达降低(P<0.01),MPO含量和血清TNF-α、IL-1β活性增高(P<0.01),MMP-9表达增多、Occludin表达减少(P<0.01);与I/R组相比,SI组神经缺损评分、脑梗死体积、脑含水量和伊文思蓝渗透量降低(P<0.05或P<0.01),Fe^(2+)和MDA含量减少、GSH含量及GPX4表达升高(P<0.05或P<0.01),MPO含量和血清TNF-α、IL-1β活性降低(P<0.05或P<0.01),MMP-9表达下调、Occludin表达上调(P<0.05,P<0.01)。结论SI预处理可能通过改善脑血流,抑制铁死亡、炎症反应和保护BBB,进而减轻脑缺血/再灌注损伤。

建立与青年大鼠神经功能损伤程度相同的老年大鼠大脑中动脉阻塞模型

目的建立青年、老年两个年龄组大鼠神经功能损伤程度相同的大脑中动脉阻塞(middle cerebral artery occlusion,MCAO)模型,以避免因动物模型偏倚引起的脑缺血药物疗效及毒理学机理等研究的实验结果不准确。方法采用雄性SD大鼠,首先通过实验探索适合老年大鼠的线栓型号后,大鼠被随机分为4组:青年假手术组(n=20),老年假手术组(n=20),青年MCAO组(n=20),老年MCAO组(n=20)。建立青年MCAO组、老年MCAO组大鼠神经功能损伤程度相同的MCAO模型。通过改良的神经功能评分(mNSS)、角测试评估、梗死区细胞凋亡情况评估大鼠脑损伤情况。结果青年大鼠选用线栓型号为硅胶头直径0.32 mm、插入深度(18±2)mm,老年大鼠线栓型号为硅胶头直径0.43 mm,插入深度(22±2)mm。通过调整线栓位置,当青年大鼠局部脑血流量(regional cerebral blood flow,rCBF)为基线血流的15%、老年大鼠rCBF为基线血流的25%时,二者术后3 d内神经功能损伤水平差异无统计学意义(P>0.05),梗死区域细胞凋亡程度相同(P>0.05)。结论通过调节大鼠rCBF能控制脑损伤程度,从而可建立青年、老年神经功能损伤程度相同的大鼠MCAO模型,用于脑缺血的相关研究,以避免因动物模型偏倚引起的脑缺血药物疗效及毒理学机理等研究的实验结果不准确。

三七皂甙对脑组织血液供应和能量代谢的影响

目的研究三七皂甙（ＰＮＳ）对脑组织血液供应和能量代谢的影响。方法采用激光多普勒流量仪动态监测软脑膜微循环的变化以及反相高效液相法测定脑组织中高能磷酸化合物的含量。结果ＰＮＳ２５、５０ｍｇｋｇ－１ｉｖ明显扩张麻醉小鼠软脑膜微血管，增加局部血流量，加快血流速度；但对结扎双侧颈总动脉引起的脑血流量的减少没有作用。ＰＮＳ（５０、１００ｍｇｋｇ－１ｉｐ，×３ｄ）明显延缓缺血组织ＡＴＰ的分解，改善能量负荷。结论ＰＮＳ可通过增加组织血液供应改善能量代谢，从而保护脑组织。

尤瑞克林对大鼠局灶性脑缺血半暗带脑血流量影响的研究

目的研究尤瑞克林对大鼠局灶性脑缺血后半暗带血流量的影响。方法线栓法制备大鼠局灶性脑缺血模型,应用激光多普勒血流监测仪经颅测量脑缺血中心区及半暗带脑血流量,1%2,3,5-三苯基氯化四氮唑染色法测定脑梗死体积。结果脑缺血半暗带局部脑血流(regional cerebral blood flow,rCBF)在大、中剂量尤瑞克林给药后5min开始上升,在20min达峰值,小剂量尤瑞克林对缺血半暗带rCBF变化则无明显影响。脑缺血24h后生理盐水组、大中小剂量尤瑞克林治疗组梗塞面积分别为30.38%±2.76%,16.44%±3.17%,16.61%±2.76%,28.58%±2.38%,大中剂量尤瑞克林组与生理盐水组比较有统计学差异(P<0.05),小剂量尤瑞克林组与生理盐水组比较无统计学差异(P>0.05)。结论尤瑞克林可以减少大鼠局灶性脑缺血后梗塞面积,其治疗作用可能与增加缺血半暗带局部脑血流量有关。

红景天苷对麻醉犬脑循环及大鼠全脑缺血再灌注的影响

目的:研究红景天苷对麻醉犬脑循环及大鼠全脑缺血再灌注的影响。方法:以电磁流量计测定麻醉犬颈内动脉和椎动脉的血流量,用多导生理记录仪记录血压、心率(HR)的变化;采用Pulsinelli四动脉结扎法略加改良制作大鼠全脑缺血再灌注模型,记录脑电图(EEG)和翻正反射恢复时间以及脑组织匀浆伊文思蓝(EB)含量。结果:静脉滴注红景天苷(8,4,2mg/kg)能明显增加麻醉犬的脑血流量(CBF)和降低脑血管阻力(CVR)对平均动脉压(MAP)和HR无明显影响;静脉注射红景天苷(24,12,6mg/kg)能明显缩短全脑缺血再灌注大鼠EEG和翻正反射恢复时间,降低脑匀浆EB含量。结论:红景天苷可通过增加CBF和降低CVR改善脑血液循环,并且对全脑缺血再灌注有明显的保护作用。

三七总皂甙对实验性脑缺血脑血流及血脑屏障的影响作用

目的 观察三七总皂甙对脑缺血后再灌流期间血脑屏障及脑血流的影响。方法 利用大鼠局灶性脑缺血再灌流和全脑缺血再灌流损伤两种实验模型。结果 与相应对照组比较 ,不论是全脑缺血还是局灶性脑缺血 1h后再灌流 3d ,应用三七总皂甙的各组动物及水肿明显减轻 ,血脑屏障通透性改善 ,大脑局部血流量显著增加。结论 三七总皂甙对脑缺血后脑水肿、血脑屏障。

牛磺酸对急性局部脑缺血大鼠脑血流和脑梗死体积的影响

目的 :研究牛磺酸对脑缺血再灌注模型大鼠的局部脑血流和脑梗死体积的影响。方法 :用大脑中动脉栓塞 (MCAO)法制作大鼠急性局部脑缺血再灌注模型 ,分别用 10 ,4 0和 80mg·kg- 1牛磺酸经腹腔注射给药 ,检测缺血 1h和灌注 30min内脑血流 ,再灌注 2 4h后进行神经功能缺损评分并计算脑梗死体积的大小。结果 :MCAO引起大脑中动脉供血区脑血流显著下降 ,牛磺酸可减少脑血流量下降的幅度 ;缺血 1h再灌注 2 4h后 ,模型组脑梗死体积为 (33±s 9) % ,而牛磺酸治疗组脑梗死体积明显缩小 ,各组分别为 (17± 5 ) % ,(12± 5 ) %和 (11± 3) % ;牛磺酸治疗组神经缺损评分比模型组小。结论 :牛磺酸可以增加缺血局部的脑血流量 ,缩小脑梗死体积 ,对急性脑缺血具有脑保护作用。

苦丁茶的心血管药理作用研究

苦丁茶的水提液能显著增加离体豚鼠心脏冠脉流量,提高小鼠耐缺氧能力,对垂体后叶素所致大鼠急性心肌缺血有明显保护作用,并能增加麻醉兔的脑血流量,降低脑血管阻力和血压。

血液光量子疗法对局灶性脑缺血大鼠大脑皮层局部血流量和脑水肿的影响

本文动态观测了光量子疗法治疗血栓栓塞性脑缺血大鼠,大脑皮层局部血流量(rCBF)及脑水肿的变化。结果:缺血6小时经光量子血液治疗2小时后,rCBF于注后30min明显增加,达19.78％(P<0.01),以后各点维持在一定水平,2小时增加到19.30(P<0.05)。脑组织比重:缺血中心区未见明显改善(P>0.1)而半暗区组织比重非常明显增加(P<0.001),可见水肿明显减轻。说明光量子疗法增加rCBF,减轻半暗区水肿。