Campylobacter diarrhea in children in South Asia: A systematic review

BackgroundCampylobacter spp. are one of the commonest causes of diarrhea in children under five and in resource poor settings also lead to malabsorption and stunting. The purpose of this systematic review was to understand the burden of Campylobacter spp. associated diarrhea among children in the South Asian countries.MethodsThis systematic review followed the PRISMA (Preferred Reporting Items for Systematic reviews and Meta-Analysis) guidelines. Databases were searched with defined keywords for publications from the years 1998–2018. Data on proportion of positive samples was extracted to compare the rates of Campylobacter infection among children (under the age of 19) from different study populations.ResultsOf the 359 publications screened, 27 eligible articles were included in this systematic review and categorized based on study design. In 8 case-control studies, Campylobacter spp. was detected more frequently among diarrheal cases (range, 3.2–17.4%) than non-diarrheal cases (0–13%). Although there were variations in the study population, overall, children under the age of two years experienced Campylobacter diarrhea more often than older children. Most studies reported stool culture as the method used to detect Campylobacter spp. however retesting using PCR-based methods significantly increased detection rates. Limited data were available on Campylobacter species. In 4 studies that provided species data, C. jejuni (3.2–11.2%) was shown to be the most common species, followed by C. coli.ConclusionIn South Asia, Campylobacter spp. are one of the most common bacterial diarrheal pathogens affecting children but there is a paucity of data on species, risk factors and attributable sources. Although a few studies were available, the epidemiology of campylobacteriosis remains uncertain. To understand the true burden and sources of infection, more detailed studies are needed collecting data from human, animal and environmental sources and using both culture and genomic tools.     

Hepatitis C virus infection and lichen planus: a short review

OBJECTIVE: To review the current literature regarding the association of lichen planus (LP) and liver disease, with particular attention to the association of the oral variant of the disease with hepatitis C virus (HCV) infection.
MATERIALS AND METHODS: Available literature of the possible association of LP with systemic disorders, in particular chronic hepatic disease, has been reviewed. RESULTS: LP is sometimes associated with infectious or autoimmune disease and/or neoplasia, however an aetio-logical association between LP and these disorders seems unlikely. A more consistent association exists between LP and chronic hepatic disease. The precise cause of this association is not known. However, in the last 6 years a notable association between HCV infection and LP has been observed, particularly in patients in Spain, Italy and Japan. The pathogenesis of this possible HCV-associated LP is not known, but it may involve a cell mediated response to an altered epithelial antigen.
CONCLUSION: There is now evidence to suggest a significant association between HCV infection and LP in some groups of patients.     

Angioedema and swellings of the orofacial region

OBJECTIVE: Patients may have various forms of angioedema and require dental treatment which can cause or contribute to the onset of an episode of angioedema. This paper seeks to highlight the causes and the management of this serious condition.
DESIGN: An outline of the different types of angioedema is given here, along with three case reports which illustrate treatment and management.
SUBJECTS AND METHODS: Three patients who presented to an Oral Medicine clinic with angioedema are presented to illustrate various types of angioedema and the different contributing factors that precipitated episodes of the condition.
MAIN OUTCOME MEASURES: The three patients were all investigated for biochemical and allergic factors which may have caused their disease.
RESULTS: Both drugs and dental materials were shown to be involved in the pathogenesis of angioedema in this short series of patients.
CONCLUSIONS: Dental treatment or the use of some materials may promote or contribute to the disorder. Referral to hospital for specialist care is indicated for certain groups of patients who require invasive dental treatment. The multi-disciplinary team approach in the investigation and management of patients with angioedema is emphasised.     

The fit of gold-alloy full-crown castings made with ceramic casting ring liners.

Measurements were made of the fit of gold-alloy full-crown castings produced with dry ceramic ring liners. When used with vacuum investing, these liners absorb relatively large amounts of water from the investment mix (thereby reducing its original W/P ratio) and then function as wet liners, thus increasing the investment's potential expansion and giving castings which are consistently larger than when air investing is used. With four of the five liners tested, investing in air produced many castings which were unacceptably undersized (inaccuracy worse than -0.2%). The fifth liner, an industrial material 2 mm thick, gave only one casting out of 12 which was outside this limit, although all castings were undersized to a lesser extent. Vacuum investing gave improved casting accuracy; with four of the five liners, the improvement was highly significant (p < 0.001), and with the fifth, probably significant (p < 0.05). Even with vacuum investing, however, with only two of the liners did all castings show inaccuracies within +/- 0.2%. With the other three liners, some castings (ranging from 2/10 to 7/9) had inaccuracies worse than -0.2%. With both air and vacuum investing, changing from one liner to another caused changes in relative casting accuracy which were often significant (p < 0.01) or highly significant (p < 0.001). In casting techniques where a ceramic ring liner is used, the choice of specific lining material and the choice between investing in air or under vacuum are important factors which can have a major effect on the fit of castings.     

Impact testing of a polysulphone denture base polymer

A bstract — The impact resistance of a polysulphone denture base polymer has been determined, and for comparison the impact resistance was also determined of a linear poly(methyl methacrylate) and four rubber-modified methacrylate denture base polymers. When tested under mouth conditions the polysulphone had an impact resistance more than four times as high as the poly(methyl methacrylate) and about twice as high as the most impact resistant rubber-modified methacrylate. Unlike some of the other materials tested, the polysulphone did not suffer a reduction in impact resistance on extended ageing under mouth conditions.     

急性心肌梗死后外周血单个核细胞表面CD147与基质金属蛋白酶-9 mRNA表达的相关性

目的：基质金属蛋白酶在急性心肌梗死后的心室重构中起着重要作用，但其调节机制目前尚未明确。实验拟通过动物模型的建立及体外细胞培养，观察急性心肌梗死后单个核细胞表面CD147与心肌成纤维细胞基质金属蛋白酶-9 mRNA表达的关系。 方法：实验于2006—08／2007-06在河北省人民医院临床实验中心完成。实验材料：SD大鼠及SD仔鼠（出生1～3d）购自河北医科大学试验动物中心。实验过程中对动物处置符合动物伦理学标准。实验方法：①将30只大鼠随机分为急性心肌梗死组（n=15）和假手术组（n=15），假手术组只过线不结扎。流式细胞分析法检测大鼠术后24h外周血单个核细胞表面CD147表达。②选择SD仔鼠制备心肌成纤维细胞。将单个核细胞与心肌成纤维细胞以细胞数0．5：1，1：1，2：1混合培养24h后，半定量反转录一聚合酶联反应法检测基质金属蛋白酶-9 mRNA表达。当单核细胞与心肌成纤维细胞2：1混合时，加入CD147单克隆抗体1，2，4μL/L，培养24h后检测基质金属蛋白酶-9 mRNA表达。 结果：①急性心肌梗死后外周血单个核细胞表面CD147表达明显增加。②单个核细胞与心肌成纤维细胞混合培养，随着单个核细胞比例的增加，心肌成纤维细胞基质金属蛋白酶-9 mRNA表达增加。③在单个核细胞与心肌成纤维细胞2：1混合培养体系中，随着加入CD147单克隆抗体浓度的增加，基质金属蛋白酶-9 mRNA生成减少。 结论：急性心肌梗死后单个核细胞表面CD147表达明显增加，对心肌成纤维细胞基质金属蛋白酶-9生成起上游调节作用。     

多普勒超声诊断移植肾排斥反应与病理检查及肾功能指标的对比分析

目的：以病理活检结果为金标准，评估多普勒超声检查对移植肾排斥反应的诊断价值。方法：选择2003—01/2006—12在中国医科大学附属第一医院器官移植科行肾移植并在术后行超声检查的患者176例，均知情同意。①实验分组：根据术后移植肾功能分为2组，移植肾功能不良组78例，其中30例次行病理活检；移植肾功能正常组98例。②实验方法及评估：对患者移植肾行多普勒超声检查，参数选择峰收缩期流速、平均舒张期流速、阻力指数及血管显示率。血管显示率的评估标准（0～5级）：0级为肾动脉及其远侧血管未显示；5级为肾各级血管均显示良好。以病理活检结果为金标准，分别选取阻力指数=0．7，0．75，0．8，0．85为诊断界值进行诊断试验。结果：169例患者进入结果分析，脱落7例。①峰收缩期流速、平均舒张期流速不呈正态分布，无法作为肾功能评价指标。30例次病理活检中共有28例次被确诊为排斥反应，急性排斥反应15例次，慢性排斥反应13例次。②肾功能正常组患者中血管显示率5级者占63．30％，4级者占36．73％。肾功能不良组患者中血管显示率4级者占41．03％，3级者占46．15％，2级者占10．30％，1级者占2．60％。③移植肾功能不良组患者阻力指数显著高于移植肾功能正常组（P〈0．01）。移植肾功能不良组患者移植肾功能恢复后阻力指数显著低于移植肾尚未恢复时（P〈0．01），其中99％以上的患者△（阻力指数）≥0.20。④界值阻力指数=0．75的诊断试验的敏感性、特异性和准确性最高，均达到100％。结论：当移植肾血管阻力指数升高至0．75以上，特别是同一患者自身对照升高超过0.2以上和或血管显示率低于4级，结合临床表现和生化结果，提示可能出现移植肾排斥反应。     

自体骨髓间充质干细胞移植后心肌缝隙连接蛋白43表达与室性心动过速发生的关系

目的:缝隙连接蛋白43对维持心肌细胞的连接通讯功能、电信号传导和正常的节律性收缩起重要作用,其表达和分布的异常是多种室性心律失常的解剖学基础,建立小型猪急性心肌梗死模型.观察自体骨髓间充质干细胞移植后室性心动过速的发生及心肌缝隙连接蛋白43的表达方法:实验于2006-01/2007-01在河北省人民医院导管室完成。①材料:选取8～12月龄小型猪22头,由河北医科大学实验动物中心提供,体质量20～30 kg,随机数字表法分为细胞移植组12头、模型对照组10头.实验过程中对动物的处置符合动物伦理学际准②实验方法:无菌条件下抽取猪双侧股骨骨髓20 mL,percoll法 贴壁法分离培养骨髓间充质干细胞,待细胞生长达75%融合时用胰酶消化传代。将传至第2代细胞加入终浓度为10μmol/L的5-氮胞苷进行诱导,用胶体金标记12 h后继续培养20 d用于移植:两组小型猪均采用球囊堵闭法建立急性心肌梗死模型.心电图监测示相关至少2个导联ST段抬高大于0.2 mV、术后血肌钙蛋白和肌酸磷酸激酶同工酶升高超过正常的两倍为建模成功标准:细胞移植组于造模成功后经OTW球囊于第一对角支远端1 cm处再次阻断血流,注入经胶体金标记的10×10~7个骨髓间充质干细胞。③实验评估:于细胞移植后2 h及4周行电生理程序刺激.观察室性心动过速的发生情况。末次电生理检查后、采用免疫组化染色法检测心肌缝隙连接蛋白43的表达.计算其积分吸光度值。结果:①模型建立指标检测:与术前比较.造模后所有小型猪血肌钙蛋白含量和肌酸磷酸激酶同工酶活性均增高,峰值浓度分别为(21.3±3.6)μg/L和(178.3×41.4)IU/L,术中心电图ST段平均抬高(10.67±1.43)mm.证明急性心肌梗死模型成功建立。②骨髓间充质干细胞移植后室性心动过速的发生情况:与模型对照组诱发出室性心动过速的动物数量比较,术后2 h细胞移植组无明显变化(X~2=0.201,P=0.650),术后4周细胞移植组明显降低(X~2=4.455.P=0.035)。②骨髓间充质干细胞移植后梗死心肌缝隙连接蛋白43的表达:术后4周移植到梗死心肌的骨髓间充质干细胞与宿主心肌生长为一体,移植部位颜色变黑,苏木精-伊红染色示移植细胞的胞浆呈紫红色。细胞移植组心肌梗死区缝隙连接蛋白43积分吸光度值明显高于模型对照组(t=16,82.P=0.00),细胞移植组中未发生室性心动过速小型猪的梗死心肌缝隙连接蛋白43的表达明显高于发生室性心动过速小型猪(t=5.06,P=0.00)。结论:自体骨髓间充质干细胞移植可促进急性心肌梗死猪心肌缝隙连接蛋白43的表达,其表达程度可能与急性心肌梗死室性心动过速的发生有关。