SD

SD
  • 文章类型: Journal Article
    系统动力学(SD)被广泛认为是在产品系统的生命周期评估(LCA)研究中模拟空间和时间动力学的工具。然而,对于如何以一致的方式有效地一起应用SD和LCA,尚无共识。为了解决这个差距,本研究进行了系统的文献综述,分析了2010年至2023年全球发表的54篇科学论文,探讨了LCA与SD的联合应用。该研究旨在回答三个研究问题:(1)什么可以被认为是LCA和SD的集成?(2)SD和LCA如何有效地集成?(3)这种集成的优势和制约因素是什么?结果强调了LCA和SD作为可持续设计影响评估工具的普及,每个人都有自己的优势和局限性。当LCA与SD联合应用时,确定了两种主要的集成类型:(1)在SD模型中包含生命周期清单和表征因子,(2)将SD模型包含在LCA中。在第二种类型的整合中,SD对技术系统的组成部分进行建模,其结果作为情景分析的输入,为LCA模型提供时间和潜在的空间清单数据。综合方法提供了对产品可持续性的全面理解,有助于决策,并增强利益相关者的参与度。该研究还确定了在环境情景分析中联合应用SD和LCA的知识差距,建议纳入优化工具和为政策制定者提供战略指导。
    System dynamics (SD) is widely recognized as a tool for simulating spatial and temporal dynamics in life cycle assessment (LCA) studies of the product system. However, there is no agreement on how SD and LCA could be applied effectively together in a consistent way. To address this gap, this research conducted a systematic literature review, analyzing 54 scientific articles published worldwide between 2010 and 2023, to explore the joint application of LCA with SD. The study aimed to answer three research questions: (1) What can be considered an integration of LCA and SD? (2) How can SD and LCA be effectively integrated? and (3)What are the advantages and constraints of this integration? The results highlighted the popularity of LCA and SD as impact assessment tools for sustainable design, each with its own strengths and limitations. Two primary integration types were identified when LCA was jointly applied with SD: (1) inclusion of the life cycle inventory and characterization factors in an SD model, and (2) inclusion of SD model results in an LCA. In the second type of integration, SD models the components of the technical system, and its outcomes served as input for scenario analysis, providing temporal and potentially spatial inventory data for the LCA model. The integrated approach offers a comprehensive understanding of product sustainability, aids decision-making, and enhances stakeholder engagement. The study also identifies knowledge gaps in the joint application of SD and LCA for environmental scenario analysis, suggesting the incorporation of optimization tools and strategy guidance for policy makers.
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  • 文章类型: Journal Article
    UNASSIGNED: Stretch marks, also known as striae cutis distensae (SD), are visible linear scars that occur in regions of dermal damage due to skin stretching. Stretch marks are not serious health issues, but they may have a major psychological effect on patients. Due to poor skin color improvement or prolonged skin atrophy, there is no standard treatment for SD. Fillers have been studied for their effectiveness in the treatment of SD.
    UNASSIGNED: This systematic review aims to determine the efficacy of fillers on SD.
    UNASSIGNED: This systematic review is reported following PRISMA guidance. We included all relevant articles published up to November 2022 in the following electronic databases: Science Direct, Midline, the Web of Science, CINAHL, and Google Scholar. The initial search yielded 119, of which seven were included after applying inclusion and exclusion criteria.
    UNASSIGNED: The systematic review included a total of 184 female participants who were over the age of 18 years old. Three studies used jet volumetric remodeling (JVR) to inject HA pneumatically. One study injected polycaprolactone filler. One study used calcium hydroxylapatite, micro-needling, and ascorbic acid. MFU-V and CaHA were given in one study. One study delivered MFU-V using micro-focused ultrasound. All studies showed that it reduces SD with only mild, temporary side effects. More favor was given to combining CaHA and MFU-V, which had the fewest side effects compared to other dermal fillers.
    UNASSIGNED: As monotherapy or combination therapy, injectable dermal fillers may treat SD with minimal adverse effects. We suggest that more RCTs look into injectable dermal filler to find out what is best for patients with SD and compare it to other treatment methods in terms of results, costs, and side effects to provide satisfactory practice and basic guideline interventions for these cases.
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  • 文章类型: Journal Article
    背景:中药(TCM)正变得越来越流行,相关的不良事件经常被忽略或低估。
    目的:本系统综述旨在评估中医肝损伤(TCM-ILI)的临床特征和结局,并评估中医-ILI在所有药物性肝损伤(DILI)中的比例。
    方法:中国国家知识基础设施,万方,VIP,PubMed,搜索了Embase数据库。人口统计,临床,和生存数据被提取和汇集。计算与较差结果相关的因素。对于比例荟萃分析,数据采用随机效应模型进行汇总.
    结果:总体而言,检索到21,027篇文章,最终包括625个。女性和老年患者占主导地位。肝移植的比例为2.18%(7/321)。死亡率为4.67%(15/321)。男性,高天冬氨酸转氨酶和直接胆红素,和低白蛋白与TCM-ILI患者死亡/肝移植风险增加显著相关.TCM-ILI在所有DILI中所占比例为25.71%。比例随年份逐渐增加。
    结论:我们的工作总结了当前有关临床表现的知识,病程,和中医-ILI的预后。中医可以导致肝毒性,甚至死亡或需要挽救生命的肝移植。应严格建立政府对中药产品的监管。
    BACKGROUND: Traditional Chinese medicine (TCM) is becoming increasingly popular and related adverse events are often ignored or underestimated.
    OBJECTIVE: This systematic review aimed to evaluate the clinical characteristics and outcomes of TCM-induced liver injury (TCM-ILI) and to estimate the proportion of TCM-ILI in all drug-induced liver injuries (DILI).
    METHODS: China National Knowledge Infrastructure, Wanfang, VIP, PubMed, and Embase databases were searched. Demographic, clinical, and survival data were extracted and pooled. Factors associated with worse outcomes were calculated. For the proportion meta-analyses, the data were pooled by using a random-effects model.
    RESULTS: Overall, 21,027 articles were retrieved, of which 625 were finally included. There was a predominance of female and older patients. The proportion of liver transplantation was 2.18% (7/321). The mortality was 4.67% (15/321). Male, higher aspartate aminotransferase and direct bilirubin, and lower albumin were significantly associated with an increased risk of death/liver transplantation in TCM-ILI patients. The proportion of TCM-ILI in all DILI was 25.71%. The proportion was gradually increased with year.
    CONCLUSIONS: Our work summarises current knowledge regarding clinical presentation, disease course, and prognosis of TCM-ILI. TCM can result in hepatotoxicity, even death or necessitate life-saving liver transplantation. Governmental regulation of TCM products should be strictly established.
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  • 文章类型: Journal Article
    有证据表明,剖宫产可能与胎盘输血减少和新生儿血液学状况不良有关。然而,临床研究报告的结果有些不一致.我们进行了系统评价和荟萃分析,以检查剖宫产是否影响胎盘输血和铁相关血液学指标。Pubmed,WebofScience,ScienceDirect,和Ovid数据库检索了2013年4月9日之前发表的相关研究。剖宫产和阴道分娩的平均差异(胎盘残余血容量;血细胞比容水平,血红蛋白浓度,和脐带血/外周血中的红细胞计数)被提取并使用随机效应模型合并。我们确定了15项符合荟萃分析条件的研究(n=8477)。与阴道出生的新生儿相比,那些通过剖宫产出生的人有更高的胎盘残余血容量[加权平均差(WMD),8.87毫升;95%置信区间(CI),2.32ml-15.43ml];较低的血细胞比容水平(WMD,-2.91%;95%CI,-4.16%至-1.65%),血红蛋白(WMD,-0.51g/dL;95%CI,-0.74g/dL至-0.27g/dL)和红细胞(WMD,-0.16×10(12)/L;95%CI,-0.30×10(12)/L~-0.01×10(12)/L)。亚组分析显示,新生儿外周血中血细胞比容的WMD(-6.94%;95%CI,-9.15%至-4.73%)明显低于脐带血(-1.75%;95%CI,-2.82%,-0.68%)(用于测试亚组差异的P值<0.001)。总之,与阴道分娩相比,剖宫产与胎盘输血减少以及脐血和外周血中铁相关血液学指标差有关。这表明剖宫产分娩的新生儿可能更容易受到婴儿期缺铁性贫血的影响。
    Evidence suggests that cesarean section is likely associated with a reduced placental transfusion and poor hematological status in neonates. However, clinical studies have reported somewhat inconsistent results. We conducted a systematic review and meta-analysis to examine whether cesarean section affects placental transfusion and iron-related hematological indices. Pubmed, Web of Science, ScienceDirect, and Ovid Databases were searched for relevant studies published before April 9, 2013. Mean differences between cesarean section and vaginal delivery in outcomes of interests (placental residual blood volume; hematocrit level, hemoglobin concentration, and erythrocyte count in cord/peripheral blood) were extracted and pooled using a random effects model. We identified 15 studies (n = 8477) eligible for the meta-analysis. Compared with neonates born vaginally, those born by cesarean section had a higher placental residual blood volume [weighted mean difference (WMD), 8.87 ml; 95% confidence interval (CI), 2.32 ml-15.43 ml]; a lower level of hematocrit (WMD, -2.91%; 95% CI, -4.16% to -1.65%), hemoglobin (WMD, -0.51 g/dL; 95% CI, -0.74 g/dL to -0.27 g/dL) and erythrocyte (WMD, -0.16 × 10(12)/L; 95% CI, -0.30 × 10(12)/L to -0.01 × 10(12)/L). Subgroup analysis showed that the WMD for hematocrit in neonate\'s peripheral blood (-6.94%; 95% CI, -9.15% to -4.73%) was substantially lower than that in cord blood (-1.75%; 95% CI, -2.82%, -0.68%) (P value for testing subgroup differences <0.001). In conclusion, cesarean section compared with vaginal delivery is associated with a reduced placental transfusion and poor iron-related hematologic indices in both cord and peripheral blood, indicating that neonates delivered by cesarean section might be more likely affected by iron-deficiency anemia in infancy.
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  • 文章类型: Journal Article
    Traumatic spinal cord injury (SCI) is a devastating event with huge personal and societal costs. A limited number of treatments exist to ameliorate the progressive secondary damage that rapidly follows the primary mechanical impact. Mesenchymal stem or stromal cells (MSCs) have anti-inflammatory and neuroprotective effects and may thus reduce secondary damage after administration. We performed a systematic review with quantitative syntheses to assess the evidence of MSCs versus controls for locomotor recovery in rat models of traumatic SCI, and identified 83 eligible controlled studies comprising a total of 1,568 rats. Between-study heterogeneity was large. Fifty-three studies (64%) were reported as randomised, but only four reported adequate methodologies for randomisation. Forty-eight studies (58%) reported the use of a blinded outcome assessment. A random-effects meta-analysis yielded a difference in behavioural Basso-Beattie-Bresnahan (BBB) locomotor score means of 3.9 (95% confidence interval [CI] 3.2 to 4.7; P<0.001) in favour of MSCs. Trial sequential analysis confirmed the findings of the meta-analyses with the upper monitoring boundary for benefit being crossed by the cumulative Z-curve before reaching the diversity-adjusted required information size. Only time from intervention to last follow-up remained statistically significant after adjustment using multivariate random-effects meta-regression modelling. Lack of other demonstrable explanatory variables could be due to insufficient meta-analytic study power. MSCs would seem to demonstrate a substantial beneficial effect on locomotor recovery in a widely-used animal model of traumatic SCI. However, the animal results should be interpreted with caution concerning the internal and external validity of the studies in relation to the design of future clinical trials.
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  • 文章类型: Journal Article
    背景:慢性斑块状银屑病是最常见的银屑病类型,其特征是发红,厚度,和缩放。一线管理是局部治疗。
    目的:我们试图对慢性斑块状银屑病的局部治疗进行Cochrane综述。
    方法:我们系统地检索了主要数据库中的随机对照试验。试验报告使用一系列相关措施有所改善;标准化,汇总的结果被转化为6分改善量表.
    结果:该综述包括177项随机对照试验,包括34,808名参与者,包括26项头皮牛皮癣试验和6项反向和/或面部牛皮癣试验。典型的试验持续时间为3至8周。与安慰剂(润肤剂)相比,维生素D类似物和强效皮质类固醇的平均改善约为1分,地替洛尔1.2分,非常有效的皮质类固醇1.8点,联合维生素D类似物加类固醇1.4分每日一次和2.2分每日两次。然而,这些是来自异质性试验结果的指示性获益.皮质类固醇在治疗头皮牛皮癣方面比维生素D更有效。对于身体和头皮牛皮癣,强效皮质类固醇比维生素D更不可能引起皮肤刺激.
    结论:福利报告,不利影响,和安全评估方法往往是不够的。在许多比较中,异质性使得治疗获益的大小不确定。
    结论:皮质类固醇与维生素D类似物一样有效,并且对皮肤的刺激性较小。然而,需要进一步研究以告知长期维持治疗并提供适当的安全性数据.
    BACKGROUND: Chronic plaque psoriasis is the most common type of psoriasis and is characterized by redness, thickness, and scaling. First-line management is with topical treatments.
    OBJECTIVE: We sought to undertake a Cochrane review of topical treatments for chronic plaque psoriasis.
    METHODS: We systematically searched major databases for randomized controlled trials. Trials reported improvement using a range of related measures; standardized, pooled findings were translated onto a 6-point improvement scale.
    RESULTS: The review included 177 randomized controlled trials with 34,808 participants, including 26 trials of scalp psoriasis and 6 trials of inverse and/or facial psoriasis. Typical trial duration was 3 to 8 weeks. When compared with placebo (emollient base), the average improvement for vitamin-D analogues and potent corticosteroids was approximately 1 point, dithranol 1.2 points, very potent corticosteroids 1.8 points, and combined vitamin-D analogue plus steroid 1.4 points once daily and 2.2 points twice daily. However, these are indicative benefits drawn from heterogeneous trial findings. Corticosteroids were more effective than vitamin D for treating psoriasis of the scalp. For both body and scalp psoriasis, potent corticosteroids were less likely than vitamin D to cause skin irritation.
    CONCLUSIONS: Reporting of benefits, adverse effects, and safety assessment methods was often inadequate. In many comparisons, heterogeneity made the size of treatment benefit uncertain.
    CONCLUSIONS: Corticosteroids are as effective as vitamin-D analogues and cause less skin irritation. However, further research is needed to inform long-term maintenance treatment and provide appropriate safety data.
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  • 文章类型: Comparative Study
    BACKGROUND: Elevation of adiponectin levels is a potential therapeutic tool against cardiovascular and metabolic diseases. Clinical evidence suggests differences between fibrates and statins in improving circulating concentrations of adiponectin.
    OBJECTIVE: To compare the efficacy of fibrates vs. statins on circulating concentrations of adiponectin by meta-analysis of randomized head-to-head trials.
    METHODS: A systematic literature search of Medline was conducted to identify randomized head-to-head comparative trials investigating the efficacy of fibrates vs. statins on circulating levels of adiponectin. Inverse variance-weighted mean differences (WMDs) and 95% confidence intervals (CIs) were calculated for net changes in adiponectin concentrations using a random-effects model. Random-effects meta-regression was performed to assess the effect of putative moderators on adiponectin levels.
    RESULTS: Six trials with a total of 326 subjects (166 in the fibrate and 160 in the statin group) met the eligibility criteria and were selected for this meta-analysis. The estimated effect size for fibrate versus statin therapy was 0.42 μg/mL (95% CI: -0.34-1.17). This effect size was robust in the leave-one-out sensitivity analysis and not sensitive to any single study. Meta-regression indicated a borderline significant association between duration of treatment and the effect of fibrates vs. statins on adiponectin concentrations (slope: -0.20; 95% CI: -0.41-0.01; p=0.06). However, baseline body mass index, glucose and lipid levels did not predict the effect of fibrate vs. statin therapy on circulating adiponectin concentrations (p>0.05).
    CONCLUSIONS: Monotherapy with either fibrates or statins has comparable effects on circulating concentrations of adiponectin. Thus, differential effects of statins and fibrates on the occurrence of cardiovascular events may not be attributed to the corresponding changes in adiponectin levels.
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  • 文章类型: Journal Article
    血液苯丙氨酸浓度的波动可能是早期和连续治疗的苯丙酮尿症(PKU)患者智力结局的重要决定因素。这篇综述评估了苯丙氨酸波动的研究,影响波动的因素,如果稳定苯丙氨酸浓度会影响结果,尤其是神经认知结果。对英语出版物进行了Embase和PubMed的电子文献检索,还搜索了已确定出版物的参考书目。PKU患者,上午苯丙氨酸浓度最高。可能影响苯丙氨酸波动的因素包括年龄,饮食,蛋白质替代品和能量摄入的时机和剂量,饮食依从性,苯丙氨酸羟化酶基因型,饮食中苯丙氨酸摄入量和蛋白质代谢的变化,疾病,和增长率。24小时内不含苯丙氨酸的蛋白质替代品摄入的均匀分布可能会减少血液苯丙氨酸的波动。与对照组相比,对6R-四氢生物蝶呤有反应和治疗的患者的血液苯丙氨酸浓度波动较小。血液中苯丙氨酸浓度的增加可能会在数小时内导致脑和脑脊液苯丙氨酸浓度增加。尽管一些证据表明,稳定血液苯丙氨酸浓度可能对PKU患者有益,需要更多的研究来区分血液苯丙氨酸波动和代谢控制不良的影响。
    Fluctuations in blood phenylalanine concentrations may be an important determinant of intellectual outcome in patients with early and continuously treated phenylketonuria (PKU). This review evaluates the studies on phenylalanine fluctuations, factors affecting fluctuations, and if stabilizing phenylalanine concentrations affects outcomes, particularly neurocognitive outcome. Electronic literature searches of Embase and PubMed were performed for English-language publications, and the bibliographies of identified publications were also searched. In patients with PKU, phenylalanine concentrations are highest in the morning. Factors that can affect phenylalanine fluctuations include age, diet, timing and dosing of protein substitute and energy intake, dietary adherence, phenylalanine hydroxylase genotype, changes in dietary phenylalanine intake and protein metabolism, illness, and growth rate. Even distribution of phenylalanine-free protein substitute intake throughout 24h may reduce blood phenylalanine fluctuations. Patients responsive to and treated with 6R-tetrahydrobiopterin seem to have less fluctuation in their blood phenylalanine concentrations than controls. An increase in blood phenylalanine concentration may result in increased brain and cerebrospinal fluid phenylalanine concentrations within hours. Although some evidence suggests that stabilization of blood phenylalanine concentrations may have benefits in patients with PKU, more studies are needed to distinguish the effects of blood phenylalanine fluctuations from those of poor metabolic control.
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  • 文章类型: Journal Article
    UDP-glucuronosyltransferases (UGT) catalyze the biotransformation of many endobiotics and xenobiotics, and are coded by polymorphic genes. However, knowledge about the effects of these polymorphisms is rarely used for the individualization of drug therapy. Here, we present a quantitative systematic review of clinical studies on the impact of UGT variants on drug metabolism to clarify the potential for genotype-adjusted therapy recommendations. Data on UGT polymorphisms and dose-related pharmacokinetic parameters in man were retrieved by a systematic search in public databases. Mean estimates of pharmacokinetic parameters were extracted for each group of carriers of UGT variants to assess their effect size. Pooled estimates and relative confidence bounds were computed with a random-effects meta-analytic approach whenever multiple studies on the same variant, ethnic group, and substrate were available. Information was retrieved on 30 polymorphic metabolic pathways involving 10 UGT enzymes. For irinotecan and mycophenolic acid a wealth of data was available for assessing the impact of genetic polymorphisms on pharmacokinetics under different dosages, between ethnicities, under comedication, and under toxicity. Evidence for effects of potential clinical relevance exists for 19 drugs, but the data are not sufficient to assess effect size with the precision required to issue dose recommendations. In conclusion, compared to other drug metabolizing enzymes much less systematic research has been conducted on the polymorphisms of UGT enzymes. However, there is evidence of the existence of large monogenetic functional polymorphisms affecting pharmacokinetics and suggesting a potential use of UGT polymorphisms for the individualization of drug therapy.
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  • 文章类型: Journal Article
    Pharmaceuticals and personal care products (PPCPs) have been detected as contaminants of emerging concern ubiquitously in the aquatic environment in China and worldwide. A clear picture of PPCP contamination in the Chinese aquatic environment is needed to gain insight for both research and regulatory needs (e.g. monitoring, control and management). The occurrence data of 112 PPCPs in waters and sediments in China has been reviewed. In most cases, the detected concentration of these PPCPs in waters and sediments were at ng/L and ng/g levels, which were lower than or comparable to those reported worldwide. A screening level risk assessment (SLERA) identified six priority PPCPs in surface waters, namely erythromycin, roxithromycin, diclofenac, ibuprofen, salicylic acid and sulfamethoxazole. The results of SLERA also revealed that the hot spots for PPCP pollution were those river waters affected by the megacities with high density of population, such as Beijing, Tianjin, Guangzhou and Shanghai. Limitations of current researches and implications for future research in China were discussed. Some regulatory issues were also addressed.
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