ARTERIOSCLEROSIS

动脉硬化
  • 文章类型: Journal Article
    目的:预防动脉粥样硬化性心血管疾病(ASCVD)在代谢综合征成分(MetS)的个体中很重要,牙周炎可能在这一过程中起重要作用。这项研究旨在评估参与者中牙周炎和ASCVD与MetS成分之间的关联。包括肥胖,血糖异常,高血压,和血脂异常。
    方法:本研究遵循MOOSE报告指南和PRISMA2020指南。EMBASE,MEDLINE,WebofScience,科克伦图书馆,截至2023年4月9日,PubMed和OpenGrey进行了有关MetS成分人群牙周炎与ASCVD联系的观察性研究。队列,研究选择后纳入病例对照和横断面研究.适当时使用原始和修改的纽卡斯尔-渥太华量表进行质量评估。采用随机效应模型进行Meta分析。
    结果:19项研究最终纳入质量分析,所有这些都被评估为中等质量到高质量。15项研究的荟萃分析显示,患有牙周炎的参与者在患有血糖异常的人群中更容易发生ASCVD(RR=1.25,95%CI=1.13-1.37;p<0.05),肥胖(RR=1.13,95%CI=1.02-1.24;p<0.05),血脂异常(RR=1.36,95%CI=1.13-1.65;p<0.05),或高血压(1.20,95%CI=1.05-1.36;p<0.05)。
    结论:牙周炎促进了具有一种MetS成分(肥胖,血糖异常,高血压或血脂异常)。
    结论:在具有MetS成分的人群中,牙周炎可能导致ASCVD的发生。
    OBJECTIVE: Prevention of atherosclerotic cardiovascular disease (ASCVD) is important in individuals with metabolic syndrome components (MetS), and periodontitis may play an important role in this process. This study aims to evaluate the association between periodontitis and ASCVD in participants with the components of MetS, including obesity, dysglycemia, hypertension, and dyslipidemia.
    METHODS: This study conducted followed the MOOSE reporting guidelines and the PRISMA 2020 guidelines. EMBASE, MEDLINE, Web of Science, Cochrane Library, PubMed and OpenGrey were searched for observational studies about the linkage of periodontitis to ASCVD in people with MetS components up to April 9, 2023. Cohort, case-control and cross-sectional studies were included after study selection. Quality evaluation was carried out using the original and modified Newcastle-Ottawa Scale as appropriate. Random-effects model was employed for meta-analysis.
    RESULTS: Nineteen studies were finally included in the quality analysis, and all of them were assessed as moderate to high quality. Meta-analyses among fifteen studies revealed that the participants with periodontitis were more likely to develop ASCVD in those who have dysglycemia (RR = 1.25, 95% CI = 1.13-1.37; p < 0.05), obesity (RR = 1.13, 95% CI = 1.02-1.24; p < 0.05), dyslipidemia (RR = 1.36, 95% CI = 1.13-1.65; p < 0.05), or hypertension (1.20, 95% CI = 1.05-1.36; p < 0.05).
    CONCLUSIONS: Periodontitis promotes the development of ASCVD in participants with one MetS component (obesity, dysglycemia, hypertension or dyslipidemia).
    CONCLUSIONS: In people with MetS components, periodontitis may contribute to the ASCVD incidence.
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  • 文章类型: Journal Article
    保持健康的血管结构和功能对于健康的怀孕很重要。肥胖是血管外科手术术后不良结局的众所周知的预测因子。然而,脉搏波速度(PWV)之间的关联,动脉僵硬度评估的公认参数,妊娠相关疾病仍不清楚。因此,我们进行了系统的审查,我们进行了荟萃分析以评估相关关联.
    我们系统地搜索了WebofScience和PubMed数据库,以获得在2023年4月之前发表的有关PWV和妊娠相关疾病的文章。使用带有标准偏差的平均值来评估有或没有相关疾病的孕妇的PWV差异。根据PWV的具体类型进行亚组分析。纽卡斯尔-渥太华量表用于评估纳入研究的质量。
    共纳入来自21项研究的6488名个体。所有入选的研究都是高质量的。总的来说,患有先兆子痫的孕妇PWV升高(平均差异(MD)=0.67,95%置信区间(CI):0.51,0.83,P<0.00001),高血压(MD=1.04,95%CI:1.00,1.08,P<0.00001),妊娠期糖尿病(MD=0.34,95CI:0.19,0.48,P<0.00001),和糖尿病(MD=0.49,95CI:0.27,0.70,P<0.00001)。基于特定类型的PWV的亚组分析显示出相似的结果。
    在我们的研究中,PWV在妊娠相关疾病中升高,包括先兆子痫,高血压,和糖尿病。PWV评估应被视为孕妇预防和管理妊娠期心血管疾病的临床常规。
    UNASSIGNED: Maintaining healthy vascular structure and function is important for a healthy pregnancy. Obesity is a well-known predictor for poor postoperative outcomes of vascular surgery. However, the association between pulse wave velocity (PWV), a well-recognized parameter for arterial stiffness assessment, and pregnancy-associated diseases is still unclear. Therefore, we conducted this systematic review, and a meta-analysis was performed to assess the relevant associations.
    UNASSIGNED: We systematically searched the Web of Science and PubMed databases to obtain articles on PWV and pregnancy-associated diseases published before April 2023. The mean with standard deviation was used to assess the differences in PWV in pregnant women with or without relevant diseases. Subgroup analysis was conducted according to specific types of PWV. The Newcastle‒Ottawa Scale was used to evaluate the quality of the enrolled studies.
    UNASSIGNED: A total of 6488 individuals from 21 studies were included. All enrolled studies were high-quality. Overall, the PWV was elevated in pregnant women who suffered from preeclampsia (mean difference (MD) = 0.67, 95 % confidence interval (CI): 0.51,0.83, P < 0.00001), hypertension (MD = 1.04, 95 % CI: 1.00,1.08, P < 0.00001), gestational diabetes mellitus (MD = 0.34, 95%CI: 0.19,0.48, P < 0.00001), and diabetes (MD = 0.49, 95%CI: 0.27,0.70, P < 0.00001). Subgroup analysis based on specific types of PWV showed similar results.
    UNASSIGNED: In our study, PWV is elevated in pregnancy-associated diseases, including preeclampsia, hypertension, and diabetes. The PWV assessment should be regarded as a clinical routine for pregnant women to prevent and manage cardiovascular diseases during pregnancy.
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  • 文章类型: Journal Article
    脂蛋白(a)(Lp(a))在心血管危险因素研究中的作用可能是,连同前蛋白转化酶枯草杆菌蛋白酶/kexin9型(iPCSK9)抑制剂药物的发现和使用,这是该领域几十年来最大的新颖性。Lp(a)浓度(尤其是非常高的水平)与某些心血管并发症有着不可否认的联系,如动脉粥样硬化性血管疾病(AVD)和主动脉瓣狭窄。然而,目前在建立流行病学关联和特定药物治疗方面存在一些局限性.首先,Lp(a)的测量高度依赖于所使用的测试,主要是因为分子的特性。其次,Lp(a)浓度超过80%由基因决定,所以,与其他心血管危险因素不同,它不能被生活方式的改变所调节。最后,尽管有许多有希望的临床试验用特定的药物来降低Lp(a),目前只有iPCSK9(由于其成本而限制使用)显着降低了Lp(a)。然而,与其他科学协会一致,SEA认为,为了增加有关Lp(a)对心血管风险的贡献的知识,与制作包含主题当前状态的文件有关,关于控制Lp(a)升高患者整体心血管风险的建议以及Lp(a)升高患者的治疗方法的建议。
    The irruption of lipoprotein(a) (Lp(a)) in the study of cardiovascular risk factors is perhaps, together with the discovery and use of proprotein convertase subtilisin/kexin type 9 (iPCSK9) inhibitor drugs, the greatest novelty in the field for decades. Lp(a) concentration (especially very high levels) has an undeniable association with certain cardiovascular complications, such as atherosclerotic vascular disease (AVD) and aortic stenosis. However, there are several current limitations to both establishing epidemiological associations and specific pharmacological treatment. Firstly, the measurement of Lp(a) is highly dependent on the test used, mainly because of the characteristics of the molecule. Secondly, Lp(a) concentration is more than 80% genetically determined, so that, unlike other cardiovascular risk factors, it cannot be regulated by lifestyle changes. Finally, although there are many promising clinical trials with specific drugs to reduce Lp(a), currently only iPCSK9 (limited for use because of its cost) significantly reduces Lp(a). However, and in line with other scientific societies, the SEA considers that, with the aim of increasing knowledge about the contribution of Lp(a) to cardiovascular risk, it is relevant to produce a document containing the current status of the subject, recommendations for the control of global cardiovascular risk in people with elevated Lp(a) and recommendations on the therapeutic approach to patients with elevated Lp(a).
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  • 文章类型: Journal Article
    心房颤动(AF),最常见的心律失常,与不良CV结果相关。血管老化(VA),定义为一生中动脉功能和结构的进行性恶化,是房颤发展和CV事件的独立预测因子。因此,早期VA的时机识别和治疗有可能降低AF发生率和相关CV事件的风险。来自COSTActionVascAgeNet的科学家和临床医生网络确定了关于AF和VA之间关系的五个临床和方法相关问题,并对文献进行了叙述性回顾,以寻找潜在的答案。这些是:(1)VA生物标志物是否与AF相关?(2)早期VA是否比时间老化更好地预测AF发生?(3)早期VA是AF患者发生CV事件的风险增强剂吗?(4)测量VA的设备是否适合进行亚临床AF检测?(5)与房颤相关的节律不规则对血管年龄的测量是否有负面影响?然而,其作为房颤患者CV事件发生的风险调节因子的作用尚有争议.在存在与AF相关的节律不规则的情况下,关于VA测量的可靠性存在有限且不确定的数据。迄今为止,没有设备配备能够在VA测量期间检测AF的工具。这代表了在高风险人群中有效进行CV预防的错失机会。需要进一步的进步来填补这一领域的知识空白。
    Atrial fibrillation (AF), the most common cardiac arrhythmia, is associated with adverse CV outcomes. Vascular aging (VA), which is defined as the progressive deterioration of arterial function and structure over a lifetime, is an independent predictor of both AF development and CV events. A timing identification and treatment of early VA has therefore the potential to reduce the risk of AF incidence and related CV events. A network of scientists and clinicians from the COST Action VascAgeNet identified five clinically and methodologically relevant questions regarding the relationship between AF and VA and conducted a narrative review of the literature to find potential answers. These are: (1) Are VA biomarkers associated with AF? (2) Does early VA predict AF occurrence better than chronological aging? (3) Is early VA a risk enhancer for the occurrence of CV events in AF patients? (4) Are devices measuring VA suitable to perform subclinical AF detection? (5) Does atrial-fibrillation-related rhythm irregularity have a negative impact on the measurement of vascular age? Results showed that VA is a powerful and independent predictor of AF incidence, however, its role as risk modifier for the occurrence of CV events in patients with AF is debatable. Limited and inconclusive data exist regarding the reliability of VA measurement in the presence of rhythm irregularities associated with AF. To date, no device is equipped with tools capable of detecting AF during VA measurements. This represents a missed opportunity to effectively perform CV prevention in people at high risk. Further advances are needed to fill knowledge gaps in this field.
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  • 文章类型: Journal Article
    动脉硬化,作为心血管疾病发展的基础,受脂代谢紊乱的影响。广泛的研究一直表明传统的脂质参数之间的相关性,动脉硬化,和心血管疾病。指南强调了针对低密度脂蛋白胆固醇(LDL-C)对心血管疾病一级和二级预防的重要性,降低LDL-C仍然是主要的降脂策略。然而,即使LDL-C降低到最佳水平,有心血管疾病的残余风险。最近的发现引起了人们对残余胆固醇(RC)的关注,这是导致这种残余风险的重要因素。RC之间的紧密联系,动脉硬化,和心血管疾病为生活方式干预和药物治疗提供了令人兴奋的机会,以控制和降低RC水平,为预防和管理相关心血管疾病提供新的目标。我们的系统评价阐明了将RC视为评估动脉硬化及其对心血管健康的潜在影响的有价值的生物标志物的重要性。通过了解残余胆固醇和动脉硬化之间的联系,研究人员和医疗保健专业人员可以制定有针对性的干预措施,以减轻心血管风险,从而改善公众健康结果,减轻与心血管疾病相关的经济负担。
    Arteriosclerosis, as the foundation for the development of cardiovascular diseases, is influenced by disturbances in lipid metabolism. Extensive research has consistently shown a correlation between conventional lipid parameters, arteriosclerosis, and cardiovascular diseases. Guidelines highlight the importance of targeting low-density lipoprotein cholesterol (LDL-C) for primary and secondary prevention of cardiovascular diseases, with reducing LDL-C remaining the primary lipid-lowering strategy. However, even when LDL-C is lowered to optimal levels, there is a residual risk of cardiovascular disease. Recent findings have brought attention to remnant cholesterol (RC) as a significant factor contributing to this residual risk. The close association between RC, arteriosclerosis, and cardiovascular diseases presents exciting opportunities for lifestyle interventions and medical treatments to control and lower RC levels, offering new targets for preventing and managing related cardiovascular conditions. Our systematic review sheds light on the importance of considering RC as a valuable biomarker in assessing arteriosclerosis and its potential impact on cardiovascular health. By understanding the link between remnant cholesterol and arteriosclerosis, researchers and healthcare professionals can develop targeted interventions to mitigate cardiovascular risks, thus improving public health outcomes and reducing the economic burden associated with cardiovascular diseases.
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  • 文章类型: Journal Article
    非侵入性超声(US)成像能够评估浅表血管的性质。各种模式可用于血管特征分析,从射频(RF)数据,多普勒和标准B/M模式成像,到最近的超高频和超快技术。本工作的目的是从技术角度概述当前最先进的非侵入性美国技术和相应的血管老化特征。在介绍了美国技术的基本概念之后,本文考虑的特征分为:1)血管壁结构;2)动态弹性特性,和3)反应性容器特性。概述表明,超声波是一种多功能,非侵入性,以及可用于获取功能信息的安全成像技术,结构,浅动脉的反应性.必须根据空间和时间分辨率要求为特定应用选择最合适的设置。标准化在验证过程和性能度量采用中的有用性出现了。基于计算机的技术应始终优先于手动措施,只要算法和学习程序是透明的和良好的描述,和性能导致更好的结果。识别最小的临床重要差异是得出关于技术的鲁棒性的结论以及将任何生物标志物转化为实践的关键点。
    Non-invasive ultrasound (US) imaging enables the assessment of the properties of superficial blood vessels. Various modes can be used for vascular characteristics analysis, ranging from radiofrequency (RF) data, Doppler- and standard B/M-mode imaging, to more recent ultra-high frequency and ultrafast techniques. The aim of the present work was to provide an overview of the current state-of-the-art non-invasive US technologies and corresponding vascular ageing characteristics from a technological perspective. Following an introduction about the basic concepts of the US technique, the characteristics considered in this review are clustered into: 1) vessel wall structure; 2) dynamic elastic properties, and 3) reactive vessel properties. The overview shows that ultrasound is a versatile, non-invasive, and safe imaging technique that can be adopted for obtaining information about function, structure, and reactivity in superficial arteries. The most suitable setting for a specific application must be selected according to spatial and temporal resolution requirements. The usefulness of standardization in the validation process and performance metric adoption emerges. Computer-based techniques should always be preferred to manual measures, as long as the algorithms and learning procedures are transparent and well described, and the performance leads to better results. Identification of a minimal clinically important difference is a crucial point for drawing conclusions regarding robustness of the techniques and for the translation into practice of any biomarker.
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  • 文章类型: Journal Article
    诸如血压和光体积描记图(PPG)信号的动脉脉搏波(PW)包含关于心血管(CV)系统的大量信息,其可以被利用来评估血管年龄并识别处于升高的CV风险的个体。我们回顾了可能性,局限性,互补性,以及降阶的差异,动脉PW传播的生物物理模型,以及分析PW信号和提取临床相关信息进行血管年龄评估的理论和经验方法。我们提供了这些模型和理论方法的详细数学推导,显示它们是如何相互关联的。最后,我们概述了未来研究的方向,以实现PW信号建模和分析的潜力,从而在临床和日常生活中准确评估血管年龄。
    Arterial pulse waves (PWs) such as blood pressure and photoplethysmogram (PPG) signals contain a wealth of information on the cardiovascular (CV) system that can be exploited to assess vascular age and identify individuals at elevated CV risk. We review the possibilities, limitations, complementarity, and differences of reduced-order, biophysical models of arterial PW propagation, as well as theoretical and empirical methods for analyzing PW signals and extracting clinically relevant information for vascular age assessment. We provide detailed mathematical derivations of these models and theoretical methods, showing how they are related to each other. Finally, we outline directions for future research to realize the potential of modeling and analysis of PW signals for accurate assessment of vascular age in both the clinic and in daily life.
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  • 文章类型: Systematic Review
    轮班工作是一种组织全天轮换时间表的方式。这可以包括同一人与其他工人轮换的1-3班。包括夜间工作的时间表与心血管风险有关,主要是由于昼夜节律失调。这项系统评价旨在确定轮班工作是否是动脉僵硬度增加的危险因素。对不同的数据库进行了系统的审查,使用以下关键字:工作轮班,夜间工作,动脉硬化,血管僵硬度,动脉僵硬度,脉搏波速度,以及他们的医学主题词。我们选择并分析了11篇关于脉搏波速度作为动脉僵硬度指标的文章。两项研究发现,与白天工人相比,轮班工人的动脉僵硬度更高,而两项研究发现相反。此外,四项研究发现,两次移位之间的动脉僵硬度没有差异,两项研究将较短的睡眠时间与动脉僵硬度相关联,一项研究观察到,体力活动可以预防轮班工人的不良心血管结局。这些发现是异质的,排除了任何可靠的结论。然而,本综述指出需要进一步研究来调查轮班工人的动脉僵硬度,对混杂因素和纵向设计有更大的控制。
    Shift work is a way of organizing rotating schedules throughout the day. This can include 1-3 shifts for the same person on a rotational basis with other workers. Schedules that include night work have been associated with cardiovascular risk, mainly due to circadian misalignment. This systematic review sought to determine whether shift work is a risk factor for increased arterial stiffness. A systematic review of different databases was performed, using the following keywords: work shift, night work, arteriosclerosis, vascular stiffness, arterial stiffness, pulse wave velocity, and their Medical Subject Headings. We selected and analyzed 11 articles regarding pulse wave velocity as an indicator of arterial stiffness. Two studies identified higher levels of arterial stiffness in shift workers compared to day workers, while two studies found the opposite. In addition, four studies found no differences in arterial stiffness between shifts, two studies associated shorter sleep duration with arterial stiffness, and one study observed that physical activity could prevent adverse cardiovascular outcomes in shift workers. The findings are heterogeneous and preclude any robust conclusions. However, the present review points to the need for further studies to investigate arterial stiffness in shift workers, with greater control for confounding factors and longitudinal design.
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  • 文章类型: Journal Article
    细胞记忆是一个有争议的概念,代表细胞通过表观遗传算子“书写和记忆”压力经历的能力。慢性的渐进过程,非传染性疾病,如2型糖尿病,癌症,和动脉硬化,可能是由异常的表观遗传重编程驱动的,促进细胞病理记忆的假设。因此,培养的糖尿病和癌症患者来源的细胞回忆起在供体生物体中的行为特征,而与培养时间和条件无关。这里,我们分析了我们小组进行的一系列假设的研究数据,我们旨在验证糖尿病中细胞病理记忆的假设存在和传播性,动脉硬化性外周动脉疾病,和癌症。这些实验基于将从代表每种疾病状况的人病理组织样品制备的无细胞滤液施用于其他健康动物。每种病理组织匀浆的给药一致地引起以下方面的忠实回顾:(1)皮肤小动脉和神经的糖尿病典型变化。(2)非血栓性动脉硬化性增厚,胶原动脉侵犯,异常血管生成,和血管重塑。(3)不同器官的恶性前和恶性上皮和间质肿瘤;都反映了供体的组织病理学,并且没有种间传播的障碍。我们假设匀浆含有以可溶性驱动因子表示的病理组织记忆代码,这些驱动因子“渗入”宿主的动物细胞,并最终强加它们的表型特征。识别和验证背后的参与者可能为未来的治疗铺平道路。
    Cellular memory is a controversial concept representing the ability of cells to \"write and memorize\" stressful experiences via epigenetic operators. The progressive course of chronic, non-communicable diseases such as type 2 diabetes mellitus, cancer, and arteriosclerosis, is likely driven through an abnormal epigenetic reprogramming, fostering the hypothesis of a cellular pathologic memory. Accordingly, cultured diabetic and cancer patient-derived cells recall behavioral traits as when in the donor\'s organism irrespective to culture time and conditions. Here, we analyze the data of studies conducted by our group and led by a cascade of hypothesis, in which we aimed to validate the hypothetical existence and transmissibility of a cellular pathologic memory in diabetes, arteriosclerotic peripheral arterial disease, and cancer. These experiments were based on the administration to otherwise healthy animals of cell-free filtrates prepared from human pathologic tissue samples representative of each disease condition. The administration of each pathologic tissue homogenate consistently induced the faithful recapitulation of: (1) Diabetic archetypical changes in cutaneous arterioles and nerves. (2) Non-thrombotic arteriosclerotic thickening, collagenous arterial encroachment, aberrant angiogenesis, and vascular remodeling. (3) Pre-malignant and malignant epithelial and mesenchymal tumors in different organs; all evocative of the donor\'s tissue histopathology and with no barriers for interspecies transmission. We hypothesize that homogenates contain pathologic tissue memory codes represented in soluble drivers that \"infiltrate\" host\'s animal cells, and ultimately impose their phenotypic signatures. The identification and validation of the actors in behind may pave the way for future therapies.
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  • 文章类型: Journal Article
    目的:全面了解动脉粥样硬化大脑中动脉(MCA)斑块,有助于临床医师对缺血性脑卒中的诊断和治疗。高分辨率磁共振成像(MRI)已用于识别有症状的MCA斑块的成像生物标志物。我们进行了系统评价和荟萃分析,以评估MCA斑块的哪些特征是罪犯病变的标志物。
    方法:PubMed,EMBASE,WebofScience,和Cochrane图书馆数据库被搜索到2022年3月的出版物。两名独立的审稿人提取了研究设计的数据,高分辨率MRI参数,和成像终点。通过使用随机效应模型,将具有动脉粥样硬化MCA斑块特征的卒中患病率的赔率比(ORs)汇总在荟萃分析中。亚组分析,敏感性分析,并对发表偏倚进行了评估。
    结果:这篇综述包括17篇文章。症状性MCA斑块与对比增强显着相关(OR,9.4;95%CI,4.3-20.4)和T1高强度(OR,6.2;95%CI,2.7-14.3)。然而,症状性斑块与T2高强度之间没有关联(OR,1.4;95%CI,0.8-2.3)。在基于不同研究设计和MR序列类型的亚组分析中,斑块增强与下游缺血事件显著相关。
    结论:根据目前的证据,高分辨率MRI上的对比增强和T1高强度作为有缺血事件风险的MCA斑块患者的成像生物标志物具有很高的潜力.未来的前景,需要颅内斑块高分辨率MRI的纵向研究,以改善颅内动脉粥样硬化斑块的治疗决策.
    OBJECTIVE: A comprehensive understanding of atherosclerotic middle cerebral artery (MCA) plaques aids physicians in diagnosis and treatment of ischemic stroke. High-resolution magnetic resonance imaging (MRI) has been used to identify imaging biomarkers of symptomatic MCA plaque. We performed this systematic review and meta-analysis to evaluate which characteristics of MCA plaque are markers of culprit lesions.
    METHODS: The PubMed, EMBASE, Web of Science, and Cochrane Library databases were searched for publications up to March 2022. Two independent reviewers extracted data on study design, high-resolution MRI parameters, and imaging end points. Odds ratios (ORs) for the prevalence of stroke with atherosclerotic MCA plaque features were pooled in the meta-analysis by using a random-effects model. Subgroup analysis, sensitivity analysis, and evaluation of publication bias were also conducted.
    RESULTS: Seventeen articles were included in this review. Symptomatic MCA plaques were significantly associated with contrast enhancement (OR, 9.4; 95 % CI, 4.3-20.4) and T1 hyperintensity (OR, 6.2; 95 % CI, 2.7-14.3). However, there was no association between symptomatic plaques and T2 hyperintensity (OR, 1.4; 95 % CI, 0.8-2.3). Plaque enhancement was significantly associated with downstream ischemic events in subgroup analyses based on different study designs and MR sequence types.
    CONCLUSIONS: Based on current evidence, contrast enhancement and T1 hyperintensity on high-resolution MRI have high potential as imaging biomarkers of patients with MCA plaques at risk of ischemic events. Future prospective, longitudinal studies of intracranial-plaque high-resolution MRI are required to improve decision-making for the management of intracranial atherosclerotic plaques.
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