vitamin C

维生素 C
  • 文章类型: Journal Article
    背景:本快速实践指南提供了一个基于证据的建议,以解决以下问题:在成人败血症或脓毒性休克中,我们应该推荐使用还是不使用静脉注射维生素C疗法?
    方法:该小组包括来自16个国家的21名专家,并对潜在的经济和智力利益冲突采用了严格的政策。《重症监护指南》提供了方法学支持,发展,和评估(指南)组。根据最新的系统审查,以及建议的分级,评估,发展,和评估方法,我们使用证据-决策框架评估了证据的确定性并提出了建议.我们进行了电子投票,要求小组同意80%以上的建议才能被采纳。
    结果:在最长的随访中,90天,静脉注射维生素C可能没有实质性影响(相对风险1.05,95%置信区间[CI]0.94至1.17;绝对风险差异1.8%,95%CI-2.2至6.2;6项试验,n=2148,中等确定性)。由于纳入研究的偏倚风险和研究结果之间的显著异质性,维生素C对早期时间点死亡率的影响具有较低或非常低的确定性。使用维生素C很少有不良事件的报告。该小组没有发现其他结果的任何主要差异,包括机械通气的持续时间,呼吸机免费天,住院或重症监护病房的住院时间,急性肾损伤,需要肾脏替代治疗。维生素C可能导致血管加压药支持的持续时间略有减少(MD-18.9小时,95%CI-26.5至-11.4;21项试验,n=2661,低确定性);但可能不会降低序贯器官衰竭评估评分(MD-0.69,95%CI-1.55至0.71;24项试验,n=4002,确定性低)。小组判断使用静脉注射维生素C的不良后果可能超过预期后果,因此发布了一项有条件的建议,禁止在脓毒症中使用静脉注射维生素C治疗。
    结论:专家组建议在成人脓毒症患者中使用静脉注射维生素C,超出了标准的营养补充。关于这个主题的小型和单中心试验应该是不鼓励的。
    BACKGROUND: This Rapid Practice Guideline provides an evidence-based recommendation to address the question: in adults with sepsis or septic shock, should we recommend using or not using intravenous vitamin C therapy?
    METHODS: The panel included 21 experts from 16 countries and used a strict policy for potential financial and intellectual conflicts of interest. Methodological support was provided by the Guidelines in Intensive Care, Development, and Evaluation (GUIDE) group. Based on an updated systematic review, and the grading of recommendations, assessment, development, and evaluation approach, we evaluated the certainty of evidence and developed recommendations using the evidence-to-decision framework. We conducted an electronic vote, requiring >80% agreement among the panel for a recommendation to be adopted.
    RESULTS: At longest follow-up, 90 days, intravenous vitamin C probably does not substantially impact (relative risk 1.05, 95% confidence interval [CI] 0.94 to 1.17; absolute risk difference 1.8%, 95% CI -2.2 to 6.2; 6 trials, n = 2148, moderate certainty). Effects of vitamin C on mortality at earlier timepoints was of low or very low certainty due to risk of bias of the included studies and significant heterogeneity between study results. Few adverse events were reported with the use of vitamin C. The panel did not identify any major differences in other outcomes, including duration of mechanical ventilation, ventilator free days, hospital or intensive care unit length of stay, acute kidney injury, need for renal replacement therapy. Vitamin C may result in a slight reduction in duration of vasopressor support (MD -18.9 h, 95% CI -26.5 to -11.4; 21 trials, n = 2661, low certainty); but may not reduce sequential organ failure assessment scores (MD -0.69, 95% CI -1.55 to 0.71; 24 trials, n = 4002, low certainty). The panel judged the undesirable consequences of using IV vitamin C to probably outweigh the desirable consequences, and therefore issued a conditional recommendation against using IV vitamin C therapy in sepsis.
    CONCLUSIONS: The panel suggests against use of intravenous vitamin C in adult patients with sepsis, beyond that of standard nutritional supplementation. Small and single center trials on this topic should be discouraged.
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  • 文章类型: Letter
    鉴于在制定2020年日本脓毒症和脓毒症休克临床实践指南时通过文献检索获得的临床证据,我们建议给这些患者服用维生素C。最近,一些随机对照试验已经发表,其中一些表明维生素C在死亡率或持续性器官功能障碍方面的有害作用。因此,我们进行了最新的系统综述和荟萃分析.因此,我们将我们的建议修改为\"我们建议不要给脓毒症患者服用维生素C(2D级:证据的确定性=\"非常低\").
    Given the available clinical evidence through the literature search when the Japanese Clinical Practice Guidelines for Management of Sepsis and Septic Shock 2020 was being created, we suggested administering vitamin C to such patients. Recently, several randomized control trials have been published, some of which suggested the harmful effect of vitamin C in terms of mortality or persistent organ dysfunction. Therefore, we performed updated systematic reviews and meta-analyses. Accordingly, we revised our recommendation as \"We suggest against administering vitamin C to septic patients (GRADE 2D: certainty of evidence = \"very low\").\"
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  • 文章类型: Journal Article
    哮喘是一种复杂的疾病,由遗传和环境因素共同引起。哮喘的患病率增长太快,不能仅归因于遗传因素。因此,环境因素越来越被认为是哮喘的病因。改变这些环境因素可能是预防哮喘的简单方法。迄今为止,饮食干预是一个有趣的可改变的因素,因为它可以在人口层面实施。全身性炎症的改变,氧化,微生物组成可能是预防的机制基础。这篇综述总结了饮食因素与哮喘发展之间关系的机制基础和临床研究证据。我们还总结了许多组织和地区指南的建议,以帮助执业医师改善患者护理。
    Asthma is a complex disease, caused by a combination of genetic and environmental factors. The prevalence of asthma is increasing too rapidly to be attributable to genetic factors alone. Thus, environmental factors are becoming increasingly recognized as the cause of asthma. Modifying these environmental factors may be a simple approach for asthma prevention. To date, dietary intervention is an interesting modifiable factor because it can be implemented at the population level. The modification of systemic inflammation, oxidation, and microbial composition might be a mechanistic basis for prevention. This review summarizes the mechanistic basis and evidence from clinical studies on the association between dietary factors and asthma development. We also summarize the recommendations from many organizations and regional guidelines to assist the practicing physician to improve patient care.
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  • 文章类型: Journal Article
    微量元素和维生素,一起命名为微量营养素(MNs),对人体新陈代谢至关重要。最近的研究表明,MNs在常见病理中的重要性,具有影响结果的重大缺陷。
    本指南旨在为每日临床营养实践提供有关MN状态评估的信息。监测,和处方。它提出了一个协商一致的术语,由于许多单词使用不准确,造成混乱。“不足”一词尤其如此,\"重新完成\",\"补码\",和“补充”。
    专家组试图将2015年标准操作程序(SOP)应用于ESPEN,重点关注疾病。然而,由于多种疾病需要临床营养,导致每个MN都有一个文本,因此无法应用此方法。而不是疾病。在Medline数据库中对文献进行了广泛的搜索,PubMed,科克伦,谷歌学者,和CINAHL。搜索的重点是生理数据,历史证据(在1996年PubMed发布之前发布),以及观察性和/或随机试验。对于每个MN,主要功能,最优分析方法,炎症的影响,潜在毒性,并在肠内或肠外营养期间提供营养。SOP措辞是为了加强建议。
    介入试验数量有限,防止荟萃分析,导致证据水平低。这些建议经历了一个协商一致的过程,这导致了一定比例的协议(%):超过90%的选票需要强有力的共识。该指南总共为26个MN提出了一系列建议,产生170个单一的建议。在许多急性和慢性疾病中发现了严重的MN存在缺陷。提出了监测和管理策略。
    本指南应能够解决高危疾病中一组MNs的次优和缺陷状态。特别是,它为营养支持期间的MN提供和监测提供实用建议。
    Trace elements and vitamins, named together micronutrients (MNs), are essential for human metabolism. Recent research has shown the importance of MNs in common pathologies, with significant deficiencies impacting the outcome.
    This guideline aims to provide information for daily clinical nutrition practice regarding assessment of MN status, monitoring, and prescription. It proposes a consensus terminology, since many words are used imprecisely, resulting in confusion. This is particularly true for the words \"deficiency\", \"repletion\", \"complement\", and \"supplement\".
    The expert group attempted to apply the 2015 standard operating procedures (SOP) for ESPEN which focuses on disease. However, this approach could not be applied due to the multiple diseases requiring clinical nutrition resulting in one text for each MN, rather than for diseases. An extensive search of the literature was conducted in the databases Medline, PubMed, Cochrane, Google Scholar, and CINAHL. The search focused on physiological data, historical evidence (published before PubMed release in 1996), and observational and/or randomized trials. For each MN, the main functions, optimal analytical methods, impact of inflammation, potential toxicity, and provision during enteral or parenteral nutrition were addressed. The SOP wording was applied for strength of recommendations.
    There was a limited number of interventional trials, preventing meta-analysis and leading to a low level of evidence. The recommendations underwent a consensus process, which resulted in a percentage of agreement (%): strong consensus required of >90% of votes. Altogether the guideline proposes sets of recommendations for 26 MNs, resulting in 170 single recommendations. Critical MNs were identified with deficiencies being present in numerous acute and chronic diseases. Monitoring and management strategies are proposed.
    This guideline should enable addressing suboptimal and deficient status of a bundle of MNs in at-risk diseases. In particular, it offers practical advice on MN provision and monitoring during nutritional support.
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  • 文章类型: Consensus Development Conference
    Periodontal diseases and dental caries are the most common diseases of humans and the main cause of tooth loss. Both diseases can lead to nutritional compromise and negative impacts upon self-esteem and quality of life. As complex chronic diseases, they share common risk factors, such as a requirement for a pathogenic plaque biofilm, yet they exhibit distinct pathophysiologies. Multiple exposures contribute to their causal pathways, and susceptibility involves risk factors that are inherited (e.g. genetic variants), and those that are acquired (e.g. socio-economic factors, biofilm load or composition, smoking, carbohydrate intake). Identification of these factors is crucial in the prevention of both diseases as well as in their management.
    OBJECTIVE: To systematically appraise the scientific literature to identify potential risk factors for caries and periodontal diseases.
    METHODS: One systematic review (genetic risk factors), one narrative review (role of diet and nutrition) and reference documentation for modifiable acquired risk factors common to both disease groups, formed the basis of the report.
    CONCLUSIONS: There is moderately strong evidence for a genetic contribution to periodontal diseases and caries susceptibility, with an attributable risk estimated to be up to 50%. The genetics literature for periodontal disease is more substantial than for caries and genes associated with chronic periodontitis are the vitamin D receptor (VDR), Fc gamma receptor IIA (Fc-γRIIA) and Interleukin 10 (IL10) genes. For caries, genes involved in enamel formation (AMELX, AMBN, ENAM, TUFT, MMP20, and KLK4), salivary characteristics (AQP5), immune regulation and dietary preferences had the largest impact. No common genetic variants were found. Fermentable carbohydrates (sugars and starches) were the most relevant common dietary risk factor for both diseases, but associated mechanisms differed. In caries, the fermentation process leads to acid production and the generation of biofilm components such as Glucans. In periodontitis, glycaemia drives oxidative stress and advanced glycation end-products may also trigger a hyper inflammatory state. Micronutrient deficiencies, such as for vitamin C, vitamin D or vitamin B12, may be related to the onset and progression of both diseases. Functional foods or probiotics could be helpful in caries prevention and periodontal disease management, although evidence is limited and biological mechanisms not fully elucidated. Hyposalivation, rheumatoid arthritis, smoking/tobacco use, undiagnosed or sub-optimally controlled diabetes and obesity are common acquired risk factors for both caries and periodontal diseases.
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