肠道微生态影响动脉粥样硬化发生发展的机制

动脉粥样硬化(AS)不仅是一种炎症性疾病,而且属于一种代谢性疾病。肠道微生态的改变可对AS的发生发展产生双面影响。一方面,肠道菌群紊乱可以通过影响机体的胆碱代谢、氧化应激、炎症反应等机制直接促进AS产生发展,此外,可通过导致AS危险因素肥胖、高脂血症、糖尿病等的产生这些间接机制促AS的进展。另一方面,益生菌及益生元的增加则可有效地降低肠道微生物内毒素产生、增强肠道屏障、减轻机体质量、缓解炎症反应、改善胰岛素抵抗,进而在AS的进展方面发挥重要作用。因此,合理调控机体肠道微生态环境成为AS防治的新型重要手段。     

PNPLA3 I148M polymorphism and progressive liver disease

The 148 Isoleucine to Methionine protein variant(I148M)of patatin-like phospholipase domain-containing 3(PNPLA3),a protein is expressed in the liver and is involved in lipid metabolism,has recently been identified as a major determinant of liver fat content.Several studies confirmed that the I148M variant predisposes towards the full spectrum of liver damage associated with fatty liver:from simple steatosis to steatohepatitis and progressive fibrosis.Furthermore,the I148M variant represents a major determinant of progression of alcohol related steatohepatitis to cirrhosis,and to influence fibrogenesis and related clinical outcomes in chronic hepatitis C virus hepatitis,and possibly chronic hepatitis B virus hepatitis,hereditary hemochromatosis and primary sclerosing cholangitis.All in all,studies suggest that the I148M polymorphism may represent a general modifier of fibrogenesis in liver diseases.Remarkably,the effect of the I148M variant on fibrosis was independent of that on hepatic steatosis and inflammation,suggesting that it may affect both the quantity and quality of hepatic lipids and the biology of non-parenchymal liver cells besides hepatocytes,directly promoting fibrogenesis.Therefore,PNPLA3 is a key player in liver disease progression.Assessment of the I148M polymorphism will possibly inform clinical practice in the future,whereas the determination of the effect of the 148M variant will reveal mechanisms involved in hepatic fibrogenesis.     

Endoscopic resection techniques for colorectal neoplasia:Current developments

Endoscopic polypectomy and endoscopic mucosal resection(EMR) are the established treatment standards for colorectal polyps. Current research aims at the reduction of both complication and recurrence rates as well as on shortening procedure times. Cold snare resection is the emerging standard for the treatment of smaller(< 5 mm) polyps and is possibly also suitable for the removal of noncancerous polyps up to 9 mm. The method avoids thermal damage, has reduced procedure times and probably also a lower risk for delayed bleeding. On the other end of the treatment spectrum, endoscopic submucosal dissection(ESD)offers en bloc resection of larger flat or sessile lesions. The technique has obvious advantages in the treatment of high-grade dysplasia and early cancer. Due to its minimal recurrence rate, it may also be an alternative to fractionated EMR of larger flat or sessile lesions. However, ESD is technically demanding and burdened by longer procedure times and higher costs. It should therefore be restricted to lesions suspicious for high-grade dysplasia or early invasive cancer.The latest addition to endoscopic resection techniques is endoscopic fullthickness resection with specifically developed devices for flexible endoscopy.This method is very useful for the treatment of smaller difficult-to-resect lesions,e.g., recurrence with scar formation after previous endoscopic resections.     

Lymph node staging in colorectal cancer:Old controversies and recent advances

Outcome prediction based on tumor stage reflected by the American Joint Committee on Cancer(AJCC)/Union for International Cancer Control(UICC)tumor node metastasis(TNM)system is currently regarded as the strongest prognostic parameter for patients with colorectal cancer.For affected patients,the indication for adjuvant therapy is mainly guided by the presence of regional lymph node metastasis.In addition to the extent of surgical lymph node removal and the thoroughness of the pathologist in dissecting the resection specimen,several parameters that are related to the pathological work-up of the dissected nodes may affect the clinical significance of lymph node staging.These include changing definitions of lymph nodes,involved lymph nodes,and tumor deposits in different editions of the AJCC/UICC TNM system as well as the minimum number of nodes to be dissected.Methods to increase the lymph node yield in the fatty tissue include methylene blue injection and acetone compression.Outcome prediction based on the lymph node ratio,defined as the number of positive lymph nodes divided by the total number of retrieved nodes,may be superior to the absolute numbers of involved nodes.Extracapsular invasion has been identified as additional prognostic factor.Adding step sectioning and immunohistochemistry to the pathological work-up may result in higher accuracy of histological diagnosis.The clinical value of more recent technical advances,such as sentinel lymph node biopsy and molecular analysis of lymph nodes tissue still remains to be defined.     

Prophecy about post-endoscopic retrograde cholangiopancreatography pancreatitis:From divination to science

One unresolved issue of endoscopic retrograde cholangiopancreatography(ERCP)is post-ERCP pancreatitis (PEP),which occurs in up to 40%of patients.Identification of risk factors for PEP is especially important in the field of ERCP practice because it may assist physicians in taking protective measures in situations with high risk.A decade ago,Freeman et al meticulously evaluated a large number of potentially relevant risk factors for PEP,which can be divided into patient-relat-ed and procedure-related issues.In this commentary, we summarize this classic article and reevaluate the risk factors for PEP from the current point of view.This is followed by assessment of strategies for prevention of PEP that can be divided into mechanical and pharmacologic methods.     

Role of endoscopic ultrasound in the screening and follow-up of high-risk individuals for familial pancreatic cancer

Managing familial pancreatic cancer(FPC)is challenging for gastroenterologists,surgeons and oncologists.High-risk individuals(HRI)for pancreatic cancer(PC)(FPC or with germline mutations)are a heterogeneous group of subjects with a theoretical lifetime cumulative risk of PC over 5%.Screening is mainly based on annual magnetic resonance imaging(MRI)and endoscopic ultrasound(EUS).The goal of screening is to identify early-stage operable cancers or high-risk precancerous lesions(pancreatic intraepithelial neoplasia or intraductal papillary mucinous neoplasms with high-grade dysplasia).In the literature,target lesions are identified in 2%-5%of HRI who undergo screening.EUS appears to provide better identification of small solid lesions(0%-46%of HRI)and chronicpancreatitis-like parenchymal changes(14%-77%of HRI),while MRI is probably the best modality to identify small cystic lesions(13%-49%of HRI).There are no specific studies in HRI on the use of contrast-enhanced harmonic EUS.EUS can also be used to obtain tissue samples.Nevertheless,there is still limited evidence on the accuracy of imaging procedures used for screening or agreement on which patients to treat.The cost-effectiveness of screening is also unclear.Certain new EUS-related techniques,such as searching for DNA abnormalities or protein markers in pancreatic fluid,appear to be promising.     

Issues and controversies in esophageal inlet patch

The proximal esophagus is rarely examined,and its inspection is often inadequate.Optical chromoendoscopy techniques such as narrow band imaging improve the detection rate of inlet patches in the proximal esophagus,a region in which their prevalence is likely underestimated.Various studies have reported correlations between these esophageal marks with different issues such as Barrett’s esophagus,but these findings remain controversial.Conflicting reports complicate the process of interpreting the clinical features of esophageal inlet patches and underestimate their importance.Unfortunately,the limited clinical data and statistical analyses make reaching any conclusions difficult.It is hypothesized that inlet patches are correlated with various esophageal and extraesophageal symptoms,diagnoses and the personalized therapeutic management of patients with inlet patches as well as the differential diagnosis for premalignant lesions or early cancers.Due to its potential underdiagnosis,there are no consensus guidelines for the management and follow up of inlet patches.This review focuses on questions that were raised from published literature on esophageal inlet patches in adults.     

Sleep,immunity and inflammation in gastrointestinal disorders

Sleep disorders have become a global issue,and discovering their causes and consequences are the focus of many research endeavors.An estimated 70 million Americans suffer from some form of sleep disorder.Certain sleep disorders have been shown to cause neurocognitive impairment such as decreased cognitive ability,slower response times and performance detriments.Recent research suggests that individuals with sleep abnormalities are also at greater risk of serious adverse health,economic consequences,and most importantly increased all-cause mortality.Several research studies support the associations among sleep,immune function and inflammation.Here,we review the current research linking sleep,immune function,and gastrointestinal diseases and discuss the interdependent relationship between sleep and these gastrointestinal disorders.Different physiologic processes including immune system and inflammatory cytokines help regulate the sleep.The inflammatory cytokines such as tumor necrosis factor,interleukin-1(IL-1),and IL-6 have been shown to be a significant contributor of sleep disturbances.On the other hand,sleep disturbances such as sleep deprivation have been shown to up regulate these inflammatory cytokines.Alterations in these cytokine levels have been demonstrated in certain gastrointestinal diseases such as inflammatory bowel disease,gastro-esophageal reflux,liver disorders and colorectal cancer.In turn,abnormal sleep brought on by these diseases is shown to contribute to the severity of these same gastrointestinal diseases.Knowledge of these relationships will allow gastroenterologists a great opportunity to enhance the care of their patients.     

Rare cystic liver lesions: A diagnostic and managing challenge

Cystic formations within the liver are a frequent finding among populations.Besides the common cystic lesions,like simple liver cysts,rare cystic liver lesions like cystadenocarcinoma should also be considered in the differential diagnosis.Thorough knowledge of each entity’s nature and course are key elements to successful treatment.Detailed search in PubMed,Cochrane Database,and international published literature regarding rare cystic liver lesions was carried out.In our research are included not only primary rare lesions like cystadenoma,hydatid cyst,and polycystic liver disease,but also secondary ones like metastasis from gastrointestinal stromal tumors lesions.Up-to date knowledge regarding diagnosis and management of rare cystic liver lesions is provided.A diagnostic and therapeutic algorithm is also proposed.The need for a multidisciplinary approach by a team including radiologists and surgeons familiar with liver cystic entities,diagnostic tools,and treatment modalities is stressed.Patients with cystic liver lesions must be carefully evaluated by a multidisciplinary team,in order to receive the most appropriate treatment,since many cystic liver lesions have a malignant potential and evolution.     

Endoscopy and polyps-diagnostic and therapeutic advances in management

Despite multiple efforts aimed at early detection through screening, colon cancer remains the third leading cause of cancer-related deaths in the United States, with an estimated 51000 deaths during 2013 alone. The goal remains to identify and remove benign neoplastic polyps prior to becoming invasive cancers. Polypoid lesions of the colon vary widely from hyperplastic, hamartomatous and inflammatory to neoplastic adenomatous growths. Although these lesions are all benign, they are common, with up to one-quarter of patients over 60 years old will develop pre-malignant adenomatous polyps. Colonoscopy is the most effective screening tool to detect polyps and colon cancer, although several studies have demonstrated missed polyp rates from 6%-29%, largely due to variations in polyp size. This number can be as high as 40%, even with advanced (> 1 cm) adenomas. Other factors including sub-optimal bowel preparation, experience of the endoscopist, and patient anatomical variations all affect the detection rate. Additional challenges in decision-making exist when dealing with more advanced, and typically larger, polyps that have traditionally required formal resection. In this brief review, we will explore the recent advances in polyp detection and therapeutic options.     

英夫利昔治疗瘘管型克罗恩病的研究进展

瘘管是克罗恩病（CD）常见的一种并发症,往往导致患者生活质量明显下降.许多临床试验证实英夫利昔对瘘管型CD安全有效.对传统治疗方案无效者,早期规律给予英夫利昔可很好地控制疾病进展和复发.对单药治疗效果不佳者,联合英夫利昔和内外科治疗可提高疗效.本文就近年英夫利昔治疗瘘管型CD的研究进展作一综述.     

大黄素诱导急性胰腺炎胰腺细胞凋亡机制的实验研究

目的 从凋亡信号传导的角度探讨中药大黄素治疗大鼠急性胰腺炎的分子生物学机制。方法 将44只雄性Wistar大鼠随机分为正常组，非治疗组，大黄素组，以腹腔注射雨蛙肽物方法诱导大鼠急性胰腺炎模型。并于大黄素治疗后6，24，48，72，96小时处死大鼠。应用HE染色比较胰腺组织病理学改变，应用Tunel法检测胰腺细胞凋亡指数，应用RT-PCR技术检测治疗前后凋亡调控基因Bak和BaxmRNA表达。结果 大黄素干预治疗急性胰腺炎后96小时淀粉酶值显低于未治疗组，胰腺细胞凋亡指数显高于未治疗组，凋亡调控基因BakmRNA的表达与未治疗组之间无显性差异。而BaxmRNA的表达显高于未治疗组。结论 大黄素治疗实验性急性胰腺炎的机制可能与干预凋亡调控基因有关。诱导凋亡调控基因Bax表达增强可能是干预凋亡信号传导的重要机制，而与Bak基因表达无关。     

大黄素诱导急性胰腺炎胰腺细胞凋亡机制的实验研究

目的从凋亡信号传导的角度探讨中药大黄素治疗大鼠急性胰腺炎的分子生物学机制.方法将44只雄性Wistar大鼠随机分为正常组、非治疗组、大黄素组.以腹腔注射雨蛙肽的方法诱导大鼠急性胰腺炎模型,并于大黄素治疗后6、24、48、72、96小时处死大鼠.应用HE染色比较胰腺组织病理学改变,应用Tunel法检测胰腺细胞凋亡指数,应用RT-PCR技术检测治疗前后凋亡调控基因Bak 和Bax mRNA表达.结果大黄素干预治疗急性胰腺炎后96小时淀粉酶值显著低于未治疗组,胰腺细胞凋亡指数显著高于未治疗组,凋亡调控基因Bak mRNA 的表达与未治疗组之间无显著性差异,而Bax mRNA的表达显著高于未治疗组.结论大黄素治疗实验性急性胰腺炎的机制可能与干预凋亡调控基因有关,诱导凋亡调控基因Bax表达增强可能是干预凋亡信号传导的重要机制,而与Bak 基因表达无关.     

北京市某医院结核科护士压力源调查分析

目的 对结核科护士工作压力源进行调查分析.方法 自行设计调查问卷,采用便利抽样方法,对首都医科大学附属北京胸科医院88名结核科护士工作压力源进行调查.结核科护士平均年龄为（33.04±9.07）岁,工作年限（12.70±9.04）年,每月夜班数（4.25±2.25）个.本研究结核科护士工作压力源问卷分为8个维度,共有61个条目,采用分量法计分.其中,没有压力1分,压力程度一般为2分,压力程度较高为3分,压力程度非常高为4分,可能的得分范围为61～244分,分数越高,表明护士所承受的压力越大.采用问卷调查法,调查前向被调查者说明调查的目的、方法,取得知情同意.由研究者亲自发放调查问卷,30 min后当场收回.本次共发放问卷90份,回收88份,有效88份,有效回收率97.8％.结果 （1）结核科护士压力源总体得分为（154.81±36.03）分.（2）压力源各维度得分从高到低依次是：结核护理专业特殊性的问题（3.07±0.81）分;工作环境及资源方面的问题（2.88±0.81）分;工作量及时间分配问题（2.67±0.78）分;社会环境带来的问题（2.63±0.78）分;护理专业发展方面的问题（2.55±0.74）分;患者护理方面的问题（2.52±0.68）分;护理专业及工作方面的问题（2.45±0.74）分;管理及人际关系方面的问题（1.89±0.64）分.（3）得分排在前10位的压力源条目分别是：长期接触排菌、耐药肺结核患者（3.55±0.78）分;担心自己患上结核病（3.47±0.88）分;同伴被确诊患上结核病（3.36±0.89）;担心消毒防护设施的效果（3.28±0.94）分;担心工作中出现差错事故（3.21±0.95）分;工作环境差（3.18±0.92）分;病区拥挤（3.02±1.07）分;收入差距大（2.98±0.94）分;工作量太大（2.97±0.94）分;经常倒班（2.94±1.03）分.结论 结核科护士承受着较高的工作压力,护理管理者应采取有针对性的措施,指导护士积极应对,减轻护士工作压力.     

2011年全国血吸虫病监测点疫情分析

目的了解2011年全国81个血吸虫病监测点疫情变化趋势。方法收集2011年全国81个血吸虫病监测点螺情、人畜病情和相关因素的调查数据,分析不同地区疫情特征及变化情况。结果2011年全国血吸虫病监测点血清学检测阳性率以及居民感染率分别为7.78%和0.54%,家畜感染率为0.97%,较2010年均有所下降。2011年81个血吸虫病监测点共查出感染性钉螺面积98.30 hm2,活螺平均密度为0.222 6只/0.1 m2,感染性钉螺平均密度为0.000 3只/0.1 m2,钉螺感染率为0.14%。有螺地带敞放家畜12 422头,比2010年上升46.99%。结论2011年全国血吸虫病监测点疫情较2010年下降不明显。仍需加大家畜传染源控制措施的实施力度。