机构地区:[1]华北电网有限公司北京电力医院神经内科,北京100073 [2]首都医科大学附属北京天坛医院消化内科
出 处:《中华老年医学杂志》2012年第3期239-242,共4页Chinese Journal of Geriatrics
摘 要:目的探讨急性脑缺血后大鼠肠黏膜血流灌注和动力变化对肠黏膜屏障的影响。方法雄性Wistar大鼠64只,随机分为急性脑缺血组(32只)和假手术对照组(32只),两组大鼠分别按术后6、12、24和48h时相点分为4个亚组(每组均为8只),进行肠黏膜血流量、肠道传输系数、门静脉血内毒素水平以及多脏器组织匀浆中标记大肠杆菌移位率的检测。结果急性脑缺血组6、12、24和48h时相点肠黏膜血流量分别为(34.5±3.2)PU、(22.7±1.9)PU、(26.2±4.3)PU和(30.5±4.1)PU,与对照组(46.8±5.4)PU、(50.1士3.6)PU、(45.4土4.1)PU、(48.7±7.3)PU比较,明显降低it=2.650、2.875、2.639、2.507,均P〈0.05);肠道传输系数脑缺血组各时相点分别为0.59±0.07、0.48±0.06、0.50±0.08和0.57±0.04,均低于对照组0.73±0.04、0.75±0.02、0.74±0.06、0.76±0.03(t=2.409、2.758、2.649、2.807,均P〈0.05);脑缺血组损伤后6h内毒素水平即开始升高,24h达到高峰,各时相点较对照组均明显升高(均P〈0.05)。脑缺血组多脏器荧光标记大肠杆菌总检出率(11.4%、18.8%、25.0%、12.5%)明显高于对照组(2.1%、4.2%、2.1%、0%);内毒素水平与肠黏膜血流量和肠道传输系数呈显著相关性(r=0.861、-0.796,均P〈0.05)。结论急性脑缺血后早期肠黏膜通透性就已增高,而脑损伤大鼠肠黏膜血流、肠运动功能的下降是导致此病理生理变化的重要因素。Objective To investigate the changes of intestinal blood flow and motility and their effects on intestinal mucosa barrier in rats with acute cerebral ischemia. Methods 64 male Wistar rats were assigned randomly into cerebral isehemia group (n= 32) and control group (n= 32). The two groups were divided into four subgroups according to timepoints of 6 h, 12 h, 24 h and 48 h after operation (8 rats for each subgroup). The intestinal mucosa blood flow, intestinal transmit index and endotoxin level in portal vein were detected. The displacement ratio of E. coli was marked and counted with fluorescent microscope in tissue homogenate from organs. Results The intestinal blood flow in cerebral ischemia group at 6 h, 12 h, 24 h and 48 h after operation [(34.5±3.2)PU, (22.7±1.9) PU, (26.2±4.3) PU and (30.5±4.1) PU] were significantly lower than control group[(46.8± 5.4) PU, (50.1±3.6) PU, (45.4±4.1) PU and (48.7±7.3) PU] (t=2.650,2.875,2.639 and 2. 507, all P〈0.05). The intestinal transmit index in cerebral ischemia group at 6 h, 12 h, 24 h and 48h after operation [(0. 59 ± 0. 07) , (0.48±0.06), (0.50±0.08) and (0.57±0.04)] were decreaesd as compared with control group [(0.73± 0.04), (0.75 ± 0.02), (0.74 ± 0.06) and (0. 76±0. 03)3 (t= 2. 409, 2. 758, 2. 649 and 2. 807, all P〈0.05). The levels of endotoxin in cerebral ischemia group started to increase at 6 h and arrived to peak at 24 h, and the levels at four timepoints were (0. 382 ±0. 014) Eu/ml, (0. 466 ±0. 018) Eu/ml, (0. 478 ± 0. 029) Eu/ml and (0. 412±0. 036)Eu/ml, respectively, that were higher than those in control group[(0. 102±0. 007)Eu/ml, (0.114±0.021)Eu/ml, (0.112±0.018)Eu/mland (0.108±0.011)Eu/ml] (all P〈0.05). The total E. coli detection rates in multiple organs in cerebral ischemia group (11.4 %, 18.8 %, 25.0 % and 12.5%) were higher than in control group (2.1%, 4.2%, 2.1% and 0.0%) at four time points
分 类 号:R743.3[医药卫生—神经病学与精神病学]
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