Results 11 to 20 of about 2,331 (166)

应用超声超微血管显像筛查颈动脉斑块新生血管的可行性 [PDF]

open access: yesZhongshan Daxue xuebao. Yixue kexue ban, 2019
【目的】比较超声超微血管显像(SMI)和超声造影(CEUS)对颈动脉斑块新生血管的评价结果,探讨SMI作为颈动脉斑块新生血管筛查方法的可行性。【方法】患者60例,共109个斑块,使用SMI和CEUS检查评估斑块新生血管情况。【结果】在109个斑块中,SMI和CEUS检测结果一致的有101个。SMI的费用更低(150元vs.900元)。SMI的检测时间更短[(5.0±1.4)vs.(18.5±2.2)min ...
张辉
doaj   +2 more sources

颈动脉内中膜厚度及斑块分级在预测冠心病中的作用 [PDF]

open access: yesZhongshan Daxue xuebao. Yixue kexue ban, 2006
【目的】界定颈动脉内中膜厚度及其斑块分级在估测冠心病中的最佳预测值。【方法】用高频超声检测125例患者颈总动脉内中膜厚度、颈动脉分叉处内中膜厚度,以及颈动脉斑块分级,评价它们估测冠心病的作用,并用ROC曲线评价它们的诊断价值。【结果】冠心病组颈总动脉及分叉处内中膜增厚、斑块分级高,与对照组比较差异有统计学意义,P〈0.05;ROC分析显示颈总动脉及分叉处内中膜增厚、斑块分级均可估测冠心病,其曲线下面积分别为0.70、0.75、0.74;将颈总动脉分叉处内中膜增厚≥1.3mm,颈总动脉内中膜增厚≥0 ...
刘东红   +5 more
doaj   +2 more sources

Highly efficient fluid-solid coupled incompressible SPH simulation method for atherosclerotic plaque generation(动脉粥样硬化斑块生成的高效流固耦合不可压缩SPH模拟方法)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2023
动脉粥样硬化是导致心血管疾病和中风的关键诱因,对该病变过程进行模拟与可视化有助于开展医学研究。为解决现有模拟方法不能可视化动脉粥样硬化斑块生成过程以及模拟速度过慢问题,提出了一种基于高效流固耦合不可压缩光滑粒子流体动力学(smoothed particle hydrodynamics,SPH)的斑块生成模拟方法。首先,基于流固耦合不可压缩SPH方法,将血液离散为不可压缩流体粒子,以控制血液流动的稳定性;然后,使用斑块生成模型对血液、单核细胞等粒子建模,对血液成分进行病理性分析,控制斑块生成;最后 ...
汪飞(WANG Fei)   +5 more
doaj   +1 more source

非狭窄性颈动脉斑块与前循环不明原因栓塞性卒中的相关性研究 Correlation of Non-Stenotic Carotid Plaque with Anterior Circulation Embolic Stroke of Undetermined Source

open access: yesZhongguo cuzhong zazhi, 2022
目的 探索同侧非狭窄性颈动脉粥样硬化斑块特征与前循环不明原因栓塞性卒中(embolic stroke of undetermined source,ESUS)的相关性。 方法 回顾性纳入北京市大兴区人民医院神经内科2017年1月-2022年5月连续住院的急性单侧前循环缺血性ESUS患者。采用颈动脉超声评估双侧非狭窄性颈动脉粥样硬化斑块,比较梗死同侧颈动脉与对侧颈动脉斑块的发生率、多发斑块的发生率、不均质回声斑块的比例以及颈动脉斑块厚度等特征的差异。 结果 共纳入101例ESUS患者,平均年龄60.7±
徐莹鑫, 张爽, 周晓梅, 袁景林, 赵留庄, 杨海华
doaj   +1 more source

Obstruction of biodiversity conservation by minimum patch size criteria

open access: yesConservation Biology, Volume 37, Issue 5, October 2023., 2023
Abstract Minimum patch size criteria for habitat protection reflect the conservation principle that a single large (SL) patch of habitat has higher biodiversity than several small (SS) patches of the same total area (SL > SS). Nonetheless, this principle is often incorrect, and biodiversity conservation requires placing more emphasis on protection of ...
Federico Riva, Lenore Fahrig
wiley   +1 more source

TRPC1/TRPC3 channels mediate lysophosphatidylcholine-induced apoptosis in cultured human coronary artery smooth muscles cells [PDF]

open access: yes, 2016
溶血卵磷脂(lysophosphatidylcholine,lysoPC)是氧化低密度脂蛋白(oxidizedlow-densitylipoprotein,ox-LDL)的主要成分。早期的研究表明,lysoPC可诱导人冠状动脉平滑肌细胞(humancoronaryarterysmoothmusclecells,HCASMCs)凋亡,但具体机制尚不清楚。近期,我们通过细胞活力测定,流式细胞术,共聚焦显微镜及分子生物学手段对lysoPC作用的分子机制进行研究发现,lysoPC可引发细胞外钙离子内流 ...
王渊
core   +1 more source

Female preference for males with lower pattern contrast follows Weber's law of proportional processing in jumping spiders

open access: yesFunctional Ecology, Volume 37, Issue 9, Page 2434-2446, September 2023., 2023
Read the free Plain Language Summary for this article on the Journal blog. Abstract According to Weber's law of proportional processing, perceptual discrimination between stimuli of different magnitudes is based on their proportional differences in magnitude (not absolute differences).
Bernetta Z. W. Kwek   +4 more
wiley   +1 more source

Effects of forest fragmentation on avian breeding activity

open access: yesConservation Biology, Volume 37, Issue 4, August 2023., 2023
Abstract Biodiversity declines and ecosystem decay follow forest fragmentation; initially, abundant species may become rare or be extirpated. Underlying mechanisms behind delayed extirpation of certain species following forest fragmentation are unknown.
Charles P. J. Coddington   +2 more
wiley   +1 more source

基于多对比度磁共振血管壁成像技术对前循环症状性颅内外动脉粥样硬化斑块特征的对比研究 Characteristics of Symptomatic Intra- and Extracranial Atherosclerotic Plaques in Anterior Circulation Based on Multi-contrast Magnetic Resonance Vascular Wall Imaging

open access: yesZhongguo cuzhong zazhi, 2019
【摘要】 目的 基于多对比度MRI血管壁成像技术,比较颅内动脉、颅外动脉粥样硬化斑块的特征。 方法 回顾经3D多对比度头颈联合MRI血管壁成像检查确定存在前循环症状性颅内外动脉粥样硬化斑块的患者资料。观察斑块分布情况;测量斑块负荷,包括斑块最大管壁厚度、长度、管腔狭窄程度;分析斑块内成分,包括脂质坏死核、出血、钙化,对比分析颅内动脉和颅外动脉粥样硬化斑块的影像学特征。 结果 在入组的45例患者中,共检出颅内、外动脉粥样硬化斑块203个,其中颅外动脉斑块156个(76.8%),颅内动脉斑块47个 ...
许艺兰,李睿,崔园园,郑卓肇,赵锡海
doaj   +1 more source

斑块对基于CTA虚拟计算冠状动脉血流储备分数的影响

open access: yesZhongshan Daxue xuebao. Yixue kexue ban, 2023
目的基于CT冠状动脉造影图像计算虚拟血流储备分数使冠状动脉病变的功能无创评估成为可能,目前尚不清楚斑块是否会影响基于CTA虚拟计算的冠状动脉血流储备分数,本研究以有创FFR为参考标准,分析斑块对CT-QFR值的影响。方法:回顾性研究纳入了在60 d同时接受CT冠状动脉造影(CCTA)和血流储备分数(FFR)检查的108例疑似CHD患者。通过虚拟血流计算相关软件分析CCTA图像,获得目标血管的虚拟血流储备分数(CT-QFR)、目标血管斑块的定量及定性分析,其中包括总斑块体积、斑块负荷、钙化斑块体积 ...
陈柳丹   +3 more
doaj   +2 more sources

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