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目的:研究肠系膜淋巴再灌注对肠系膜上动脉闭塞性(SMAO)休克大鼠肺部炎症反应的影响。方法:24只Wistar雄性大鼠均分为4组:SMAO组,MLR组,SMAO+MLR组,SHAM组。再灌注2h后,迅速留取肺组织,一部分制备组织匀浆,检测细胞间粘附分子(ICAM-1)和晚期糖基化产物受体(RAGE)。再另外选取固定位置肺部组织放入中性甲醛中固定,用于测定肺内HMGB1、RAGE的表达。结果:SMAO与SMAO+MLR组肺部组织匀浆ICAM-1、RAGE含量显著高于MLR与SHAM组,且SMAO+MLR组肺组织匀浆的ICAM-1、RAGE含量高于SMAO组。肺部组织内HMGB1和RAGE在MLR组与SHAM组基本不表达,或少量表达,MLR加重了SMAO休克模型中HMGB1和RAGE的表达。结论:MLR加重SMAO休克大鼠肺部炎症反应,进一步证实肠淋巴途径在SMAO休克发病学中具有重要作用,同时证实HMGB1及RAGE在SMAO休克大鼠的炎症失常反应中起重要作用。  相似文献   

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刘争杰  赵自刚  赵永泉 《生物磁学》2011,(16):3074-3076
目的:研究肠系膜淋巴再灌注对肠系膜上动脉闭塞,Ig(SMAO)休克大鼠肺部炎症反应的影响。方法:24只Wistar雄性大鼠均分为4组:SMAO组,MLR组,SMAO+MLR组,SHAM组。再灌注2h后,迅速留取肺组织,一部分制备组织匀浆,检测细胞间粘附分子(ICAM-1)和晚期糖基化产物受体(RAGE)。再另外选取固定位置肺部组织放入中性甲醛中固定,用于测定肺内HMGB1、RAGE的表达。结果-SMAO与SMAO+MLR组肺部组织匀浆ICAM-1、RAGE含量显著高于MLR与SHAM组.且SMAO+MLR组肺组织匀浆的ICAM-1、RAGE含量高于SMAO组。肺部组织内HMGB1和RAGE在MLR组与SHAM组基本不表达,或少量表达,MLR加重了SMAO休克模型中HMOB1和RAGE的表达。结论:MLR加重SMAO休克大鼠肺部炎症反应.进一步证实肠淋巴途径在SMAO休克发病学中具有重要作用,同时证实HMGB1及RAGE在SMAO休克大鼠的炎症失常反应中起重要作用。  相似文献   

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目的:评价介入血管腔内治疗孤立性肠系膜上动脉夹层(ISMAD)的安全性和疗效。方法:5例患者均通过腹部CT及血管造影明确诊断ISMAD,本组病例确诊后行介入血管腔内治疗,术后继予抗凝抗血小板治疗,并术后1、3、6个月进行CTA或血管造影随访。结果:5例患者手术成功率100%,其中支架联合弹簧圈栓塞2例,双支架重叠技术3例,无并发症发生。全部患者术后3周内症状逐渐消失;术后3~6个月时肠系膜上动脉CTA及血管造影显示动脉瘤腔不显影,支架腔内血流通畅;随访3~12个月(平均7.8个月)夹层动脉瘤无复发。结论:介入血管腔内治疗是治疗ISMAD的安全有效的方法。  相似文献   

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目的:评价介入血管腔内治疗孤立性肠系膜上动脉夹层(ISMAD)的安全性和疗效.方法:5例患者均通过腹部CT及血管造影明确诊断ISMAD,本组病例确诊后行介入血管腔内治疗,术后继予抗凝抗血小板治疗,并术后1、3、6个月进行CTA或血管造影随访.结果:5例患者手术成功率100%,其中支架联合弹簧圈栓塞2例,双支架重叠技术3例,无并发症发生.全部患者术后3周内症状逐渐消失;术后3~6个月时肠系膜上动脉CTA及血管造影显示动脉瘤腔不显影,支架腔内血流通畅;随访3~12个月(平均7.8个月)夹层动脉瘤无复发.结论:介入血管腔内治疗是治疗ISMAD的安全有效的方法.  相似文献   

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The syndromes of superior mesenteric artery insufficiency are briefly reviewed. Three cases associated with infarction of bowel which were treated with restoration of arterial flow and resection of residual irretrievable bowel are reported. In two patients an embolectomy and in one patient a bypass graft were used to restore arterial continuity. The importance of the recognition and removal of irretrievable bowel at the time of vascular reconstruction is emphasized. Success is not necessarily predicated by the time factor alone, although the importance of early diagnosis and surgical intervention cannot be denied.  相似文献   

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目的:探讨肠系膜上动脉压迫综合征病人的影像学表现和PEJ肠内营养支持治疗的疗效.方法:通过对15例SMACS患者的临床资料、诊疗过程和临床疗效的全面回顾和分析,探讨和评估该疾病的临床影像诊断方法与PEJ治疗方案的综合疗效.结果:综合影像诊断能够确诊肠系膜上动脉压迫综合征,经PEJ肠内营养支持治疗6个月后,10例(66.67%)患者体重体明显增加(>5 kg).13例(86.67%)患者复查上消化道钡餐,上消化道症状明显减轻,无明显不良反应.结论:实践证明,从病理影像学和影像解剖学的综合分析角度,分别采用钡餐造影、多层螺旋CT血管成像、B型超声检查共三种影像学技术的诊断,结合患者的病史及临床表现,可以确诊肠系膜上动脉压迫综合征.通过运用通过经皮内镜下胃造口空肠置管术(PEJ)营养支持治疗技术将肠内营养液输注至梗阻远端正常肠管,且能够避免多种并发症,使本组患者得以基本康复.  相似文献   

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Proximal resistance vessels, such as the mesenteric arteries, contribute substantially to the peripheral resistance. These small vessels of between 100-400 μm in diameter function primarily in directing blood flow to various organs according to the overall requirements of the body. The rat mesenteric artery has a diameter greater than 100 μm. The myography technique, first described by Mulvay and Halpern1, was based on the method proposed by Bevan and Osher2. The technique provides information about small vessels under isometric conditions, where substantial shortening of the muscle preparation is prevented. Since force production and sensitivity of vessels to different agonists is dependent on the extent of stretch, according to active tension-length relation, it is essential to conduct contraction studies under isometric conditions to prevent compliance of the mounting wires. Stainless steel wires are preferred to tungsten wires because of oxidation of the latter, which affects recorded responses3.The technique allows for the comparison of agonist-induced contractions of mounted vessels to obtain evidence for normal function of vascular smooth muscle cell receptors.We have shown in several studies that isolated mesenteric arteries that are contracted with phenylyephrine relax upon addition of cumulative concentrations of extracellular calcium (Ca2+e). The findings led us to conclude that perivascular sensory nerves, which express the G protein-coupled Ca2+-sensing receptor (CaR), mediate this vasorelaxation response. Using an automated wire myography method, we show here that mesenteric arteries from Wistar, Dahl salt-sensitive(DS) and Dahl salt-resistant (DR) rats respond differently to Ca2+e. Tissues from Wistar rats showed higher Ca2+-sensitivity compared to those from DR and DS. Reduced CaR expression in mesenteric arteries from DS rats correlates with reduced Ca2+e-induced relaxation of isolated, pre-contracted arteries. The data suggest that the CaR is required for relaxation of mesenteric arteries under increased adrenergic tone, as occurs in hypertension, and indicate an inherent defect in the CaR signaling pathway in Dahl animals, which is much more severe in DS.The method is useful in determining vascular reactivity ex vivo in mesenteric resistance arteries and similar small blood vessels and comparisons between different agonists and/or antagonists can be easily and consistently assessed side-by-side6,7,8.Download video file.(48M, mov)  相似文献   

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目的 建立稳定的兔急性肠系膜上静脉血栓形成模型,观察其病理学变化.方法 采用扎闭静脉、损伤血管壁、激活凝血因子等方法建立模型,分期观察病理学改变.结果 成模后可见血管腔内明显血栓形成;肠道粘膜上皮细胞水肿至坏死脱落伴大量炎性细胞浸润;血管内皮细胞从凹陷到局部坏死脱落,直至大面积坏死脱落,内皮下基质暴露.结论 本实验可成功建立兔肠系膜上静脉血栓形成模型,病理学改变符合临床,模型稳定可靠.  相似文献   

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In this study, our aims were to investigate transient receptor potential melastatin-8 channels (TRPM8) involvement in rotundifolone induced relaxation in the mesenteric artery and to increase the understanding of the role of these thermosensitive TRP channels in vascular tissue. Thus, message and protein levels of TRPM8 were measured by semi-quantitative PCR and western blotting in superior mesenteric arteries from 12 week-old Spague-Dawley (SD) rats. Isometric tension recordings evaluated the relaxant response in mesenteric rings were also performed. Additionally, the intracellular Ca2+ changes in mesenteric artery myocytes were measured using confocal microscopy. Using PCR and western blotting, both TRPM8 channel mRNA and protein expression was measured in SD rat mesenteric artery. Rotundifolone and menthol induced relaxation in the isolated superior mesenteric artery from SD rats and improved the relaxant response induced by cool temperatures. Also, this monoterpene induced an increase in transient intracellular Ca2+. These responses were significantly attenuated by pretreatment with capsazepine or BCTC, both TRPM8 channels blockers. The response induced by rotundifolone was not significantly attenuated by ruthenium red, a non-selective TRP channels blocker, or following capsaicin-mediated desensitization of TRPV1. Our findings suggest that rotundifolone induces relaxation by activating TRPM8 channels in rat superior mesenteric artery, more selectively than menthol, the classic TRPM8 agonist, and TRPM8 channels participates in vasodilatory pathways in isolated rat mesenteric arteries.  相似文献   

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Aim

The differentiation of destruction-induced thyrotoxicosis and Graves’ disease (GD) is of great importance for selection of proper therapy. Radioactive iodine uptake (RAIU) is the gold standard for differentiating these two conditions but its application has remained somewhat limited. Thyroid color Doppler flow sonography (CDFS) is a potential alternative of RAIU but more supporting evidence is warranted. In the present study, a standard operative procedure was developed to measure the mean peak systolic velocity of superior thyroid artery (STA-PSV) and evaluate its role in the differential diagnosis of thyrotoxicosis.

Methods

A total of 135 patients with untreated thyrotoxicosis were enrolled into one retrospective study (GD, n = 103; thyroiditis, n = 32) and another prospective study recruited 169 patients (GD, n = 118; thyroiditis, n = 51). Thirty normal controls were also enrolled. Thyroid function, anti-TSH-receptor antibody (TRAb), RAIU, CFDS of thyroid and STA-PSV were performed for each patient. Receiver operator curve (ROC) was used to evaluate the diagnostic value of STA-PSV in a retrospective study so as to seek the optimal cutoff point. Then the cutoff point value was used to validate its diagnostic value in a prospective study and in another thyrotoxicosis population.

Results

STA-PSV of GD was significantly higher than that of thyroiditis in both retrospective and prospective studies. The area under the ROC curve of mean STA-PSV was 0.8799 and 0.9447 in the retrospective and prospective studies respectively. If a mean STA-PSV cutoff point of 50.5 cm/s was set from the retrospective analysis for the prospective study, the sensitivity and specificity in distinguishing GD from thyroiditis were 81.04% and 96.08% respectively. Mean STA-PSV and TRAb had similar area under ROC. The coefficients of variation in STA-PSV measurement were lower than 10% for the euthyroid, thyroiditis and GD groups.

Conclusions

STA-PSV is a feasible supplement alternative of RAIU for differentiating the causes of thyrotoxicosis.  相似文献   

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Abstract: In the present study we applied an improved nerve growth factor (NGF) extraction method to examine the effects of denervation and sympathetic decentralization on NGF levels in vascular tissue. Adult male Wistar Kyoto rats underwent mesenteric arterial denervation or splanchnic nerve transection. Four days after operation, animals were killed, and the mesenteric artery and coeliac-superior mesenteric ganglia were removed. The arterial adventitia was stripped from the media to measure NGF levels in nerve and smooth muscle separately. A high concentration of NGF was detected in the normal artery, 90% of which was in the adventitial layer. Surgical denervation significantly reduced the NGF levels in the artery and ganglia by 78 and 71%, respectively. However, within the artery the level of NGF was reduced in the adventitia but not in the media. Thus, the large reduction of NGF content resulted from the loss of nerve plexus from the artery. In contrast, decentralization did not alter the NGF content in the artery, in either the adventitia or media. Our results are in marked contrast to previous studies reporting elevated levels of NGF following denervation. This discrepancy is explained by the ability of our new procedure to extract much greater amounts of NGF from the tissue.  相似文献   

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CT血管成像后处理技术在肠系膜血管栓塞诊断中的应用   总被引:1,自引:0,他引:1  
目的探讨CT血管成像(CT Angiography,CTA)后处理技术在肠系膜血管栓塞诊断中的应用价值。方法50例肠系膜血管栓塞患者,均行螺旋CT增强扫描,原始数据采用多平面重组(MPR)、容积成像(VR)和最大密度投影(MIP)方法进行后处理,观察其对明确诊断所起的作用。结果MPR、VR和MIP方法均能显示病变,以MPR显示率最高,结合3种方法可以获得明确诊断。结论CTA能够明确肠系膜血管栓塞的诊断,MPR进行图像后处理的价值最大。  相似文献   

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Objectives

We analyzed whether mast cell stabilization by either ketotifen or tranilast could alter either sympathetic or nitrergic innervation function in rat mesenteric arteries.

Methods

Electrical field stimulation (EFS)-induced contraction was analyzed in mesenteric segments from 6-month-old Wistar rats in three experimental groups: control, 3-hour ketotifen incubated (0.1 αmol/L), and 3-hour tranilast incubated (0.1 mmol/L). To assess the possible participation of nitrergic or sympathetic innervation, EFS contraction was analyzed in the presence of non-selective nitric oxide synthase (NOS) inhibitor L-NAME (0.1 mmol/L), α-adrenergic receptor antagonist phentolamine (0.1 µmol/L), or the neurotoxin 6-hydroxydopamine (6-OHDA, 1.46 mmol/L). Nitric oxide (NO) and superoxide anion (O2 .-) levels were measured, as were vasomotor responses to noradrenaline (NA) and to NO donor DEA-NO, in the presence and absence of 0.1 mmol/L tempol. Phosphorylated neuronal NOS (P-nNOS) expression was also analyzed.

Results

EFS-induced contraction was increased by ketotifen and decreased by tranilast. L-NAME increased the vasoconstrictor response to EFS only in control segments. The vasodilator response to DEA-NO was higher in ketotifen- and tranilast-incubated segments, while tempol increased vasodilator response to DEA-NO only in control segments. Both NO and O2 - release, and P-nNOS expression were diminished by ketotifen and by tranilast treatment. The decrease in EFS-induced contraction produced by phentolamine was lower in tranilast-incubated segments. NA vasomotor response was decreased only by tranilast. The remnant vasoconstriction observed in control and ketotifen-incubated segments was abolished by 6-OHDA.

Conclusion

While both ketotifen and tranilast diminish nitrergic innervation function, only tranilast diminishes sympathetic innnervation function, thus they alter the vasoconstrictor response to EFS in opposing manners.  相似文献   

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