• 文章类型: Journal Article
    食源性疾病是一个重大的公共卫生问题,尤其是在中国,它们代表了重大的食品安全挑战。目前,有必要对北京市食源性疾病的扩展流行病学模式进行全面和系统的分析。
    监测结果显示,诺如病毒和致泻性大肠杆菌(DEC)是最常见的食源性腹泻病原体。19-30岁的个体在北京食源性腹泻的风险较高,沙门氏菌感染与发烧症状有关。
    本研究分析了连续11年的监测数据,以提高对北京食源性腹泻流行病学和临床特征的认识。它旨在识别高风险人群,协助临床病原体鉴定和治疗,并支持制定量身定制的预防战略。
    UNASSIGNED: Foodborne diseases present a significant public health concern, particularly in China, where they represent a significant food safety challenge. Currently, there is a need for a thorough and systematic analysis of the extended epidemiological patterns of foodborne diseases in Beijing Municipality.
    UNASSIGNED: Monitoring results show that Norovirus and diarrheagenic Escherichia coli (DEC) are the most commonly identified foodborne diarrheal pathogens. Individuals aged 19-30 are at a higher risk of foodborne diarrhea in Beijing, with Salmonella infection being associated with fever symptoms.
    UNASSIGNED: This study analyzes 11 years of consecutive monitoring data to enhance understanding of the epidemiological and clinical features of foodborne diarrhea in Beijing. It aims to identify high-risk populations, assist in clinical pathogen identification and treatment, and support the development of tailored preventive strategies.
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  • 文章类型: Journal Article
    萎缩性胃炎(AG)和胃肠上皮化生(GIM)是胃腺癌逐步发展的早期变化。关于AG和GIM的内镜诊断和监测的国际指南存在异质性。本研究旨在确定澳大利亚中心GIM的患病率,并评估澳大利亚内窥镜医师在这两种情况下的方法。
    我们对2015年1月至2020年12月在上段胃镜检查后胃活检中诊断为GIM的成年患者进行了一项单中心回顾性研究。一个基于网络的,25个问题,调查员设计的,多项选择调查在澳大利亚所有注册内窥镜医师中进行.
    单个澳大利亚中心的GIM总体患病率在5年内为11.7%。在确定的1026名患者中,只有58.7%的人使用修改后的悉尼方案进行了活检.在队列中,1.6%有低度发育不良,0.9%患有高度发育不良,1.8%的患者在初次胃镜检查时出现恶性肿瘤.二百六十七名(百分之七点二)内窥镜医师完成调查,44.2%的人表示他们会对所有患者进行标测,36%仅适用于高危患者。只有1.5%(n=4)的受访者能够正确识别GIM/AG的所有六张内窥镜照片。
    这项研究表明,在一个大型的三级中心,GIM是一种普遍的内镜发现,但是异型增生和癌症的相关发生率很低。此外,在一小部分接受调查的澳大利亚内窥镜医师中,AG和GIM的内镜方法存在显著差异,且存在显著的知识差距.需要更多的培训来增加对GIM的识别和对组织学映射的依从性。
    UNASSIGNED: Atrophic gastritis (AG) and gastric intestinal metaplasia (GIM) are early changes in the stepwise progression to gastric adenocarcinoma. There is heterogeneity in international guidelines regarding the endoscopic diagnosis and surveillance of AG and GIM. This study aims to determine the prevalence of GIM in an Australian center and assess the approach of Australian endoscopists for these two conditions.
    UNASSIGNED: We conducted a single-center retrospective study of adult patients between January 2015 and December 2020 diagnosed with GIM on gastric biopsy following upper gastric endoscopy. A web-based, 25-question, investigator-designed, multiple-choice survey was distributed among all registered endoscopists in Australia.
    UNASSIGNED: The overall prevalence of GIM within a single Australian center was 11.7% over 5 years. Of the 1026 patients identified, only 58.7% underwent mapping biopsies using the modified Sydney protocol. Among the cohort, 1.6% had low-grade dysplasia, 0.9% had high-grade dysplasia, and 1.8% had malignancy on initial gastroscopy. Two hundred and sixty-seven (7.2%) endoscopists completed the survey, 44.2% indicated they would perform mapping for all patients, and 36% only for high-risk patients. Only 1.5% (n = 4) of respondents were able to correctly identify all six endoscopic photos of GIM/AG.
    UNASSIGNED: This study demonstrates that in a large tertiary center, GIM is a prevalent endoscopic finding, but the associated rates of dysplasia and cancer were low. Additionally, among a small proportion of surveyed Australian endoscopists, there is notable variability in the endoscopic approach for AG and GIM and significant knowledge gaps. More training is required to increase the recognition of GIM and compliance with histological mapping.
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  • 文章类型: Journal Article
    幽门螺杆菌引起的持续性感染(H.pylori),对抗生素治疗有抗药性,日益引起全球公共卫生关注。已知生物膜形成与持续性感染有关,因为其在增强抗微生物剂抗性和许多病原菌的耐受性中的作用。
    本研究旨在评估幽门螺杆菌临床分离株的生物膜形成及其对抗生素根除的影响。
    厚度,形态学,使用共聚焦激光扫描显微镜检查了来自9个幽门螺杆菌菌株的生物膜的结构,扫描电子显微镜,和透射电子显微镜。随后,通过测定阿莫西林的最小抑制浓度和最小生物膜根除浓度来评估浮游细菌和生物膜细菌的敏感性,克拉霉素,左氧氟沙星,还有四环素.
    结果显示菌株之间的生物膜厚度和密度不同,其特征是存在许多缠绕和连接细菌细胞的细丝。此外,几例表现出基于MIC测量的磁化率,但根据MBEC测量的电阻,MBEC表明较高的耐药率。Pearson相关分析显示生物膜厚度与MBEC结果呈正相关(0幽门螺杆菌的不同菌株表现出它们释放外膜囊泡(OMV)和形成生物膜的能力的差异。生物膜形成可以影响阿莫西林和四环素在根除易感细菌菌株中的有效性。
    UNASSIGNED: Persistent infections caused by Helicobacter pylori (H. pylori), which are resistant to antibiotic treatment, pose a growing global public health concern. Biofilm formation is known to be associated with persistent infections due to its role in enhancing antimicrobial resistance and the tolerance of many pathogenic bacteria.
    UNASSIGNED: This study aims to evaluate the biofilm formation of clinical isolates of H. pylori and its impact on antibiotic eradication.
    UNASSIGNED: The thickness, morphology, and structure of biofilms derived from nine H. pylori strains were examined using confocal laser scanning microscopy, scanning electron microscopy, and transmission electron microscopy. Subsequently, the susceptibility of both planktonic and biofilm bacteria was assessed through the determination of minimum inhibitory concentration and minimum biofilm eradication concentration for amoxicillin, clarithromycin, levofloxacin, and tetracycline.
    UNASSIGNED: The results revealed varying biofilm thicknesses and densities among the strains, characterised by the presence of numerous filaments intertwining and connecting bacterial cells. Additionally, several cases exhibited susceptibility based on MIC measurements but resistance according to MBEC measurements, with MBEC indicating a higher resistance rate. Pearson Correlation analysis demonstrated a positive correlation between biofilm thickness and MBEC results (0 < r < 1), notably significant for amoxicillin (r = 0.801, P = 0.009) and tetracycline (r = 0.696, P = 0.037).
    UNASSIGNED: Different strains of H. pylori exhibit variations in their capacity to release outer membrane vesicles (OMVs) and form biofilms. Biofilm formation can influence the effectiveness of amoxicillin and tetracycline in eradicating susceptible bacterial strains.
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  • 文章类型: Case Reports
    严重的胃肠道出血,由于肝假性动脉瘤(HAPA)对十二指肠的长期压迫,是极其罕见的情况。事实上,当假性动脉瘤直径较小时,诊断可能特别具有挑战性。因此及时有效的诊断和治疗具有重要意义,在这种情况下,内窥镜检查,结合血管内治疗,可以提供一种有效的方法,特别是因为它消除了手术的需要,同时产生有利的结果。
    一名75岁的老人因呕血和黑便出现在医院急诊科。尽管保守治疗,如“酸抑制,流体再供应,止血和输血“,未发现显著改善.急诊胃镜检查随后发现十二指肠球部溃疡(图1),血栓性头部暴露,表面活跃出血。此外,腹部计算机断层扫描(图2)未显示明显的HAPA表现.内镜止血不成功后,我们进行了血管造影(图3),在肝总动脉近端分支血管远端发现了直径为5.56mm的假瘤样扩张.弹簧圈栓塞后(图4),病人的病情好转,出院了,6个月后的随访显示没有复发或并发症的迹象。
    由小的肝假性动脉瘤引起的十二指肠溃疡出血非常罕见,内窥镜干预对此类病例有效。
    UNASSIGNED: Significant gastrointestinal hemorrhages, resulting from long-term compression of the duodenum by a hepatic pseudoaneurysm (HAPA), is an extremely rare condition. In fact, when the pseudoaneurysm is small in diameter, diagnosis can be particularly challenging. Timely and effective diagnosis and treatment is therefore of great significance, and in this case, endoscopy, combined with intravascular therapy, can provide an effective approach, especially since it removes the need for surgery while yielding favorable outcomes.
    UNASSIGNED: A 75-year-old old man presented to the hospital\'s emergency department with hematemesis and black stool. Despite conservative treatments such as \"acid suppression, fluid resupply, hemostasis and blood transfusion\", no significant improvement was noted. Emergency gastroscopy subsequently revealed an ulcer in the duodenal bulb (Figure 1), with an exposed thrombotic head and active bleeding on the surface. In addition, abdominal computed tomography (Figure 2) showed no obvious HAPA manifestations. After unsuccessful endoscopic hemostasis, angiography was performed (Figure 3) and a pseudotumor-like dilatation measuring 5.56 mm in diameter was found at the distal end of the proximal branch vessel of the common hepatic artery. Following spring coil embolization (Figure 4), the patient\'s condition improved and he was discharged from the hospital, with a follow-up after six months showing no signs of recurrence or complications.
    UNASSIGNED: Duodenal ulcer hemorrhages due to small hepatic pseudoaneurysms are very rare, with endoscopic intervention being effective for such cases.
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  • 文章类型: Editorial
    暂无摘要。
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  • 文章类型: Journal Article
    内镜下静脉曲张结扎术(EVL)后出血可能是多种因素的结果,包括直径太大无法完全结扎的食管静脉曲张(EV)。本研究旨在开发一种基于人工智能的内窥镜虚拟尺(EVR)来测量EV的直径,以期找到更适合EVL的病例。
    本研究是一项多中心回顾性研究,包括727例肝硬化合并EV患者的1,062例EVL,从2016年4月到2023年3月接受EVL。根据术后6周是否发生出血分为早期再出血组(n=80)和非再出血组(n=982)。患者基线数据的特点,分析术后6周的再出血情况和再出血后6周的生存状况.
    1,062例EVL手术后的早期再出血率为7.5%,出血后6周死亡率为16.5%。单因素二元logistic回归分析的结果表明,EVL后早期再出血的危险因素包括:高TB(P=0.009),低Alb(P=0.001),高PT(P=0.004),PVT(P=0.026),肝癌(P=0.018),高Child-Pugh评分(P<0.001),Child-PughC级(P<0.001),高MELD评分(P=0.004),日本静脉曲张F3级(P<0.001),EV直径(P<0.001),结扎环数(P=0.029)。多因素二元logistic回归分析的结果表明,Child-PughC级(P=0.007),日本静脉曲张F3级(P=0.009),和EV直径(P<0.001)可能在预测EVL后早期再出血方面表现出潜力。ROC分析表明,EV直径的曲线下面积(AUC)为0.848,日本静脉曲张等级的AUC为0.635,具有统计学意义(P<0.001)。因此,本研究的结果表明,与日本静脉曲张分级标准相比,EV直径在预测EVL术后早期再出血方面更优.EV直径的截止值计算为1.35cm(灵敏度,70.0%;特异性,89.2%)。
    如果EV的直径≥1.4cm,EVL手术后可能存在早期再出血的高风险;因此,我们建议谨慎使用EVL。
    UNASSIGNED: Bleeding following endoscopic variceal ligation (EVL) may occur as a result of numerous factors, including a diameter of esophageal varices (EV) that is too large to be completely ligated. The present study aimed to develop an artificial intelligence-based endoscopic virtual ruler (EVR) to measure the diameter of EV with a view to finding more suitable cases for EVL.
    UNASSIGNED: The present study was a multicenter retrospective study that included a total of 1,062 EVLs in 727 patients with liver cirrhosis with EV, who underwent EVL from April 2016 to March 2023. Patients were divided into early rebleeding (n = 80) and non-rebleeding groups (n = 982) according to whether postoperative bleeding occurred at 6 weeks. The characteristics of patient baseline data, the status of rebleeding at 6 weeks after surgery and the survival status at 6 weeks after rebleeding were analyzed.
    UNASSIGNED: The early rebleeding rate following 1,062 EVL procedures was 7.5%, and the mortality rate at 6 weeks after bleeding was 16.5%. Results of the one-way binary logistic regression analysis demonstrated that the risk factors for early rebleeding following EVL included: high TB (P = 0.009), low Alb (P = 0.001), high PT (P = 0.004), PVT (P = 0.026), HCC (P = 0.018), high Child-Pugh score (P < 0.001), Child-Pugh grade C(P < 0.001), high MELD score(P = 0.004), Japanese variceal grade F3 (P < 0.001), diameter of EV (P < 0.001), and number of ligature rings (P = 0.029). Results of the multifactorial binary logistic regression analysis demonstrated that Child-Pugh grade C (P = 0.007), Japanese variceal grade F3 (P = 0.009), and diameter of EV (P < 0.001) may exhibit potential in predicting early rebleeding following EVL. ROC analysis demonstrated that the area under curve (AUC) for EV diameter was 0.848, and the AUC for Japanese variceal grade was 0.635, which was statistically significant (P < 0.001). Thus, results of the present study demonstrated that EV diameter was more optimal in predicting early rebleeding following EVL than Japanese variceal grade criteria. The cut-off value of EV diameter was calculated to be 1.35 cm (sensitivity, 70.0%; specificity, 89.2%).
    UNASSIGNED: If the diameter of EV is ≥1.4 cm, there may be a high risk of early rebleeding following EVL surgery; thus, we recommend caution with EVL.
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  • 文章类型: Journal Article
    这项研究旨在评估妊娠后期和哺乳期饮食中低聚半乳糖(GOS)和猪胆酸(HCA)对生殖性能的影响,初乳质量,多产母猪的抗氧化能力和肠道菌群。
    共60头健康多胎杂交母猪(长白猪×约克郡)随机饲喂4组饮食:基础饮食(CTRL组),或仅含600mg/kgGOS的基础饮食(GOS组),600mg/kgGOS+100mg/kgHCA(GOS+低HCA组),从妊娠到断奶的第85天,600mg/kg+200mg/kgHCA(GOS+高HCA组)。确定了母猪的多个参数。
    在GOS组和GOS低/高HCA组中存在缩短母猪产程的趋势(p=0.07)。与CTRL组相比,GOS+低/高HCA组增加了仔猪出生时的平均体重(p<0.05),并增加初乳的IgA浓度(p<0.05)。此外,血清甘油三酯(TG)浓度较低(p<0.05),分娩时,GOS和GOS低/高HCA组的血清总抗氧化能力(T-AOC)高于CTRL组(p<0.05)。分娩时,GOS和GOS高HCA组的血清过氧化氢酶(CAT)活性高于CTRL组。16SrRNA分析表明,GOS与高剂量HCA的组合塑造了不同生殖阶段的肠道微生物群的组成(妊娠的d107,G107;泌乳d0,L0;泌乳d7,L7).在门一级,G107中的类细菌和脱硫细菌的相对丰度,类细菌,在GOS高HCA组中,L0和L7的Planctomycetota增加(p<0.05)。Spearman相关分析表明,链球菌与血清TG呈正相关,与仔猪出生时平均体重呈负相关(p<0.05)。
    这项研究表明,低聚半乳糖(GOS)与猪胆酸(HCA)联合使用,妊娠后期和哺乳期营养受限的母猪,进一步提高了它们的抗氧化能力和牛奶质量。观察到的GOS+HCA补充的有益效果可能与母猪的肠道微生物群紊乱的改善有关。
    UNASSIGNED: This study was conducted to evaluate the effects of dietary galacto-oligosaccharides (GOS) and hyocholic acids (HCA) during late gestation and lactation on reproductive performance, colostrum quality, antioxidant capacity and gut microbiota in multiparous sows.
    UNASSIGNED: A total of 60 healthy multiparous cross-bred sows (Landrace × Yorkshire) were randomly fed 4 groups diets as follows: the basal diets (CTRL group), or the basal diets containing only 600 mg/kg GOS (GOS group), 600 mg/kg GOS + 100 mg/kg HCA (GOS + Low HCA group), and 600 mg/kg + 200 mg/kg HCA (GOS + High HCA group) from d 85 of gestation to weaning. Multiple parameters of sows were determined.
    UNASSIGNED: There was a trend of shortening the labor process of sows (p = 0.07) in the GOS group and GOS + Low/High HCA group. Compared with the CTRL group, the GOS + Low/High HCA group increased the average piglets weight at birth (p < 0.05), and increased the IgA concentration of colostrum (p < 0.05). In addition, serum triglyceride (TG) concentration was lower (p < 0.05), and serum total antioxidant capacity (T-AOC) was higher (p < 0.05) in the GOS and GOS + Low/High HCA groups than in the CTRL group at farrowing. Serum catalase (CAT) activities was higher in the GOS and GOS + High HCA groups than in the CTRL group at farrowing. The 16S rRNA analysis showed that GOS combination with high-dose HCA shaped the composition of gut microbiota in different reproductive stages (d 107 of gestation, G107; d 0 of lactation, L0; d 7 of lactation, L7). At the phylum level, the relative abundance of Bacteroidota and Desulfobacterota in G107, Bacteroidota, and Proteobacteria in L0, and Planctomycetota in L7 was increased in GOS + High HCA group (p < 0.05). Spearman correlation analysis showed that Streptococcus was positively correlated with the serum TG but negatively correlated with the average piglets weight at birth (p < 0.05).
    UNASSIGNED: This investigation demonstrated that the administration of galacto-oligosaccharides (GOS) in conjunction with hyocholic acids (HCA), to sows with nutrient restrictions during late gestation and lactation, further improved their antioxidant capacity and milk quality. The observed beneficial effects of GOS + HCA supplementation could potentially be linked to an improvement in gut microbiota disorders of the sows.
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  • 文章类型: Journal Article
    最近的一些观察性研究表明,肠道微生物群组成与产褥期败血症(PS)有关,并且没有归因于此的因果关系。这项研究的目的是通过使用双样本孟德尔随机化(MR)分析来确定肠道微生物群与PS之间的因果关系。
    这项研究对可公开获取的全基因组关联研究(GWAS)摘要水平数据进行了MR分析,以探索肠道微生物群与PS之间的因果关系。肠道微生物群GWAS(n=18,340)是从MiBioGen研究中获得的,而PS的GWAS汇总水平数据是从英国生物库获得的(PS,3940例;控制,202,267例)。基于P<1.0×10-5的显著性阈值鉴定与每个特征相关的单核苷酸多态性。使用逆方差加权(IVW)参数作为MR的主要方法,并辅以其他方法。此外,一套灵敏度分析方法,包括MR-Egger截距,孟德尔随机多态性残差和离群值,进行了Cochran的Q和留一检验,以评估我们研究结果的稳健性。
    我们的研究发现了3种肠道菌群,LachnosiphiaceaeFCS020,LachnosiphiaceaeNK4A136和RuminocycaceaeNK4A214,与PS有关。IVW方法表明,使用LachnospiliaceaeFCS020,每标准偏差增加一次,PS的风险降低约19%(OR=0.81;95%CI0.66-1.00,p=0.047)。LachnospirosaceaeNK4A136也发现了类似的趋势(OR=0.80;95%CI0.66-0.97,p=0.024)。然而,RuminocycaceaeNK4A214与PS的风险呈正相关(OR=1.33,95%CI:1.07-1.67,p=0.011)。
    这项由两个样本组成的MR研究首次发现了肠道微生物群对PS风险的有益和有害因果关系的暗示证据。这可能为微生物群介导的PS的发病机理及其预防和治疗的潜在策略提供有价值的见解。
    UNASSIGNED: Some recent observational studies have shown that gut microbiota composition is associated with puerperal sepsis (PS) and no causal effect have been attributed to this. The aim of this study was to determine a causal association between gut microbiota and PS by using a two-sample Mendelian randomization (MR) analysis.
    UNASSIGNED: This study performed MR analysis on the publicly accessible genome-wide association study (GWAS) summary level data in order to explore the causal effects between gut microbiota and PS. Gut microbiota GWAS (n = 18,340) were obtained from the MiBioGen study and GWAS-summary-level data for PS were obtained from the UK Biobank (PS, 3,940 cases; controls, 202,267 cases). Identification of single nucleotide polymorphisms associated with each feature were identified based on a significance threshold of p < 1.0 × 10-5. The inverse variance weighted (IVW) parameter was used as the primary method for MR and it was supplemented by other methods. Additionally, a set of sensitivity analytical methods, including the MR-Egger intercept, Mendelian randomized polymorphism residual and outlier, Cochran\'s Q and the leave-one-out tests were carried out to assess the robustness of our findings.
    UNASSIGNED: Our study found 3 species of gut microbiota, Lachnospiraceae FCS020, Lachnospiraceae NK4A136, and Ruminococcaceae NK4A214, to be associated with PS. The IVW method indicated an approximately 19% decreased risk of PS per standard deviation increase with Lachnospiraceae FCS020 (OR = 0.81; 95% CI 0.66-1.00, p = 0.047). A similar trend was also found with Lachnospiraceae NK4A136 (OR = 0.80; 95% CI 0.66-0.97, p = 0.024). However, Ruminococcaceae NK4A214 was positively associated with the risk of PS (OR = 1.33, 95% CI: 1.07-1.67, p = 0.011).
    UNASSIGNED: This two-sample MR study firstly found suggestive evidence of beneficial and detrimental causal associations of gut microbiota on the risk of PS. This may provide valuable insights into the pathogenesis of microbiota-mediated PS and potential strategies for its prevention and treatment.
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  • 文章类型: Journal Article
    动脉粥样硬化(AS)是一种由多种病理因素引起的复杂疾病,其发病机制尚未完全阐明。近年来,研究表明,AS的发病与口腔和肠道微生物群密切相关,这可能通过几种机制启动或恶化动脉粥样硬化过程。至于这两种微生物如何影响AS,现有的机制包括侵入斑块,产生活性代谢物,释放脂多糖(LPS),并诱导炎症介质水平升高。考虑到口腔和肠道微生物群之间可能存在的深刻联系,已经研究了两种微生物组之间的相互作用对AS的起始和进展的影响。发现口腔微生物群可导致肠道菌群失调,并加剧肠道炎症。然而,相关研究不够完善,需要进行具体审查。因此,在这次审查中,我们总结了口腔微生物群和肠道微生物群对AS的最新机制,说明当前临床和流行病学证据的概述,以支持两种微生物与AS之间的双向联系。
    Atherosclerosis (AS) is a complex disease caused by multiple pathological factors threatening human health-the pathogenesis is yet to be fully elucidated. In recent years, studies have exhibited that the onset of AS is closely involved with oral and gut microbiota, which may initiate or worsen atherosclerotic processes through several mechanisms. As for how the two microbiomes affect AS, existing mechanisms include invading plaque, producing active metabolites, releasing lipopolysaccharide (LPS), and inducing elevated levels of inflammatory mediators. Considering the possible profound connection between oral and gut microbiota, the effect of the interaction between the two microbiomes on the initiation and progression of AS has been investigated. Findings are oral microbiota can lead to gut dysbiosis, and exacerbate intestinal inflammation. Nevertheless, relevant research is not commendably refined and a concrete review is needed. Hence, in this review, we summarize the most recent mechanisms of the oral microbiota and gut microbiota on AS, illustrate an overview of the current clinical and epidemiological evidence to support the bidirectional connection between the two microbiomes and AS.
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  • 文章类型: Journal Article
    衰老是导致心房颤动(AF)患病率增加的最重要因素。肠道微生物群的菌群失调与年龄相关的疾病有关,但其在房颤发展中的作用尚不清楚。本研究旨在探讨自主神经系统变化之间的相关性。短链脂肪酸(SCFA),老年房颤大鼠肠道菌群的变化。
    进行电生理实验以评估大鼠的AF诱导率和心率变异性。从粪便样品中提取的16SrRNA基因序列用于评估肠道微生物组成。使用气相和液相色谱-质谱来鉴定粪便样品中的SCFA。
    研究发现,与年轻大鼠相比,老年大鼠的AF发生率更高,心率变异性降低。组学研究显示,老年大鼠的肠道微生物群遭到破坏,特别是Firmicutes与拟杆菌的比率降低。此外,老年大鼠粪便SCFA水平明显降低。重要的是,相关分析表明,老年大鼠SCFA降低与心率变异性降低之间存在显着关联。
    这些发现表明SCFA,作为肠道微生物群的代谢产物,可能在植物神经功能中起调节作用,并可能影响老年大鼠AF的发生和进展。这些结果为SCFA和自主神经系统功能在AF发病机理中的参与提供了新的见解。这些结果为SCFA和自主神经系统功能在AF发病机理中的参与提供了新的见解。
    UNASSIGNED: Aging is the most significant contributor to the increasing prevalence of atrial fibrillation (AF). Dysbiosis of gut microbiota has been implicated in age-related diseases, but its role in AF development remains unclear. This study aimed to investigate the correlations between changes in the autonomic nervous system, short-chain fatty acids (SCFAs), and alterations in gut microbiota in aged rats with AF.
    UNASSIGNED: Electrophysiological experiments were conducted to assess AF induction rates and heart rate variability in rats. 16S rRNA gene sequences extracted from fecal samples were used to assess the gut microbial composition. Gas and liquid chromatography-mass spectroscopy was used to identify SCFAs in fecal samples.
    UNASSIGNED: The study found that aged rats exhibited a higher incidence of AF and reduced heart rate variability compared to young rats. Omics research revealed disrupted gut microbiota in aged rats, specifically a decreased Firmicutes to Bacteroidetes ratio. Additionally, fecal SCFA levels were significantly lower in aged rats. Importantly, correlation analysis indicated a significant association between decreased SCFAs and declining heart rate variability in aged rats.
    UNASSIGNED: These findings suggest that SCFAs, as metabolites of gut microbiota, may play a regulatory role in autonomic nervous function and potentially influence the onset and progression of AF in aged rats. These results provide novel insights into the involvement of SCFAs and autonomic nervous system function in the pathogenesis of AF. These results provide novel insights into the involvement of SCFAs and autonomic nervous system function in the pathogenesis of AF.
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