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51.
目的研究褐藻胶对小鼠脾淋巴细胞Th1/Th2细胞因子谱的影响。方法体内实验:分别设阴性对照组和两个褐藻胶组(0.50g/kgbw和1.50g/kgbw),每组各5只C57BL/6小鼠,分别经口给予纯净水和褐藻胶,30天后分离脾淋巴细胞,培养48h后取上清采用流式微球分析术(CBA)方法分析白细胞介素(IL-2、IL-4、IL-5)、肿瘤坏死因子(TNF)和干扰素-γ(IFN-γ)水平。体外实验:分离C57BL/6种小鼠脾淋巴细胞,与褐藻胶(25mg/ml和50mg/ml)培养48h后取上清采用CBA方法分析IL-2、IL-4、IL-5、TNF和IFN-γ水平。结果体内实验:0.5g/kgbw和1.5g/kgbw褐藻胶组IFN-γ表达水平明显高于阴性对照组(P<0.01),而IL-2和IL-4表达水平下降(P<0.01,P<0.05)。体外实验:25mg/ml和50mg/ml褐藻胶组TNF、IL-2和IL-4表达均明显高于阴性对照组(P<0.05,P<0.01),50mg/ml褐藻胶组IL-5表达水平明显高于阴性对照组(P<0.01)。结论无论是在体内还是体外实验条件下,褐藻胶对小鼠脾淋巴细胞分泌的Th1/Th2细胞因子谱均有影响。 相似文献
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Chemical closure of chronic tympanic membrane perforations 总被引:1,自引:0,他引:1
Goldman NC 《ANZ journal of surgery》2007,77(10):850-851
BACKGROUND: The purposes of closing chronic dry perforations of the tympanic membrane are to improve hearing and prevent middle ear infections. Before the use of the operating microscope and improved instrumentation, tympanic membrane perforations were closed by application of chemicals or with a temporary patch. Today, although surgery is the treatment of choice, small dry perforations may be successfully closed by chemical means in an office setting. METHODS: Twenty-eight of the 69 patients with chronic dry tympanic membrane perforations on the surgical waiting list at Hawke's Bay Regional Hospital, Hastings, New Zealand, underwent attempts at chemical myringoplasty. Two techniques were used: (i) cautery of the rim of the perforation with a silver nitrate bead on a metal probe and (ii) application of a urea ointment patch covering and overlapping the perforation. RESULTS: Eighteen of the 28 patients (64%) treated by chemical means experienced closure of their tympanic membrane perforations. Successful closure was achieved in 26% of the patients on the waiting list during the 6-month period. CONCLUSION: Chemical myringoplasty is not only of historical interest. It is an effective means of tympanic membrane closure in selected patients, thereby reducing the surgical waiting list and saving time and money for the patient, surgeon and hospital. 相似文献
54.
Ashanka Beligaswatte Eleni Tsiopelas Ian Humphreys Greg Bennett Kathryn Robinson Ken Davis Peter Bardy 《British journal of haematology》2013,162(3):409-412
There are no accepted methods to predict the development of platelet transfusion refractoriness (PTR) due to human leucocyte antigen (HLA)‐alloimmunization. Hence, matched platelets are usually given only to patients demonstrating PTR, necessarily resulting in some ineffective random donor platelets (RDPLT) transfusions. To assess its utility in predicting PTR, we retrospectively tested samples from 387 patients receiving chemotherapy for acute leukaemia or autologous transplantation using a micro‐bead flow cytometry assay. The average of the mean fluorescence intensities (avgMFI) of the class I beads in the screening assay was correlated with outcomes of RDPLT transfusions during a 2 week period. Antibodies were detected in 57 patients; 66 developed PTR, of whom 28 were alloimmunized. avgMFI usefully predicted the development of PTR (area under the receiver operating curve 0·87, 95% confidence interval: 0·77–0·96). A logistic regression model estimated the probability of PTR to be >90% when avgMFI >5440. These results indicate that micro‐bead flow cytometry assays could inform a risk‐adapted strategy for managing thrombocytopaenic HLA allo‐immunized patients. 相似文献
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Michael J Koss Marcel Pfister Florian Rothweiler Martin Michaelis Jindrich Cinatl Ralf Schubert Frank H Koch 《Acta ophthalmologica. Supplement》2012,90(2):e98-e103
Purpose: To compare cytokines in undiluted vitreous of treatment‐naïve patients with macular oedema without vitreomacular traction secondary to branch (BRVO), central (CRVO) and hemi‐central (H‐CRVO) retinal vein occlusion. Methods: Ninety‐four patients (median age 72 years, 42 men) underwent an intravitreal combination therapy, including a single‐site 23‐gauge core vitrectomy and the application of bevacizumab and dexamethasone due to vision‐decreasing macular oedema. Among these were 43 patients with BRVO, 35 with CRVO and 16 patients with hemi‐CRVO, which were distributed in a fresh or old retinal vein occlusion type (seven or more months after onset). Undiluted vitreous samples were analysed for interleukin 6 (IL‐6), monocyte chemoattractant protein‐1 (MCP‐1) and vascular endothelial growth factor (VEGF‐A) with cytometric BEAD assay. Vitreous samples from patients with idiopathic epiretinal membrane served as controls (n = 14). Results: The mean cytokine values were highest in the CRVO group with IL‐6 = 64.7 pg/ml (SD ± 115.8), MCP‐1 = 1015.8 pg/ml (±970.1) and VEGF‐A = 278.4 pg/ml (±512.8), followed by the H‐CRVO group with IL‐6 = 59.9 pg/ml (SD ± 97.5), MCP‐1 = 938.8 pg/ml (±561.1) and VEGF‐A = 211.5 pg/ml (±232.4). The BRVO group had IL‐6 = 23.2 pg/ml (SD ± 48.8), MCP‐1 = 602.6 pg/ml (±490.3) and VEGF‐A = 161.8 pg/ml (±314.4). The values of MCP‐1 and VEGF‐A were significantly different for CRVO or H‐CRVO versus BRVO. All values were significantly higher than in the control samples, which had 6.2 ± 3.4 pg/ml (IL‐6), 253 ± 74 pg/ml (MCP‐1) and 7 ± 4.9 pg/ml (VEGF‐A). Within the old RVO type, only MCP‐1 was significantly different for CRVO or H‐CRVO versus BRVO. Conclusions: Both inflammatory markers and VEGF‐A were higher in CRVO and H‐CRVO than in BRVO undiluted vitreous samples. It seems that monocyte recruitment to the vessel wall, which might underlie the importance of eosinophils in tissue remodelling after RVO, is of special interest owing to the significant difference in MCP‐1 in the older RVO types. 相似文献
58.
Richard C. Daly Andrew N. Rosenbaum Joseph A. Dearani Alfredo L. Clavell Naveen L. Pereira Barry A. Boilson Robert P. Frantz Atta Behfar Shannon M. Dunlay Richard J. Rodeheffer John A. Schirger Timucin Taner Manish J. Gandhi Julie K. Heimbach Charles B. Rosen Brooks S. Edwards Sudhir S. Kushwaha 《Journal of the American College of Cardiology》2021,77(10):1331-1340
BackgroundIn patients undergoing heart transplantation, significant allosensitization limits access to organs, resulting in longer wait times and high waitlist mortality. Current desensitization strategies are limited in enabling successful transplantation.ObjectivesThe purpose of this study was to describe the cumulative experience of combined heart-liver transplantation using a novel heart-after-liver transplant (HALT) protocol resulting in profound immunologic protection.MethodsReported are the results of a clinical protocol that was instituted to transplant highly sensitized patients requiring combined heart and liver transplantation at a single institution. Patients were dual-organ listed with perceived elevated risk of rejection or markedly prolonged waitlist time due to high levels of allo-antibodies. Detailed immunological data and long-term patient and graft outcomes were obtained.ResultsA total of 7 patients (age 43 ± 7 years, 86% women) with high allosensitization (median calculated panel reactive antibody = 77%) underwent HALT. All had significant, unacceptable donor specific antibodies (DSA) (>4,000 mean fluorescence antibody). Prospective pre-operative flow cytometric T-cell crossmatch was positive in all, and B-cell crossmatch was positive in 5 of 7. After HALT, retrospective crossmatch (B- and T-cell) became negative in all. DSA fell dramatically; at last follow-up, all pre-formed or de novo DSA levels were insignificant at <2,000 mean fluorescence antibody. No patients experienced >1R rejection over a median follow-up of 48 months (interquartile range: 25 to 68 months). There was 1 death due to metastatic cancer and no significant graft dysfunction.ConclusionsA heart-after-liver transplantation protocol enables successful transplantation via near-elimination of DSA and is effective in preventing adverse immunological outcomes in highly sensitized patients listed for combined heart-liver transplantation. 相似文献
59.
工业生产中得到广泛应用的可燃气体探测器主要有两种不同检测原理,即低温催化无焰燃烧和非色散红外吸收原理。文章分析了催化燃烧原理适应性、温度补偿的实现、线性输出的机理以及它依赖氧气、某些气体使其丧失催化性能等应用局限性;同时,分析红外吸收原理中红外波长的选择,光路、光源和吸收器等对探测器性能的影响;并指出两种原理各有特点和优点,针对不同场合正确选型,使可燃气体探测器可靠运行,保障环境安全。 相似文献
60.
动脉化疗栓塞术(TACE)是中期肝癌患者的主要治疗方法。但是,由于这种技术存在着种种缺陷,比如药物局部释放的不可控制性、全身不良反应等,限制了其临床应用。而新出现的药物缓释微球(drug-eluting beads,DEB)可以负载着阿霉素应用于TACE中,不仅可以长时间维持化疗药物的局部浓度,达到更高的客观反应率,并且降低了不良反应的发生率,从而使患者获益。目前,药物缓释微球动脉化疗栓塞术(DEB-TACE)在国外已经得到了广泛的应用和推广,更多的相关临床试验也正在进行中。本文针对DEB-TACE的特性及最新研究进展予以综述。 相似文献