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基于结构化遮挡编码和极限学习机的局部遮挡人脸识别 预览
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作者 张芳艳 王新 许新征 《计算机应用》 CSCD 北大核心 2019年第10期2893-2898,共6页
提出使用结构化遮挡编码(SOC)结合极限学习机(ELM)的算法来处理人脸识别中的遮挡问题。首先,使用SOC去除图像上的遮挡物,将遮挡物体与人脸分离开;同时,通过局部性约束字典(LCD)来估计遮挡物的位置,建立遮挡字典和人脸字典。然后,将建立... 提出使用结构化遮挡编码(SOC)结合极限学习机(ELM)的算法来处理人脸识别中的遮挡问题。首先,使用SOC去除图像上的遮挡物,将遮挡物体与人脸分离开;同时,通过局部性约束字典(LCD)来估计遮挡物的位置,建立遮挡字典和人脸字典。然后,将建立好的人脸字典矩阵进行归一化处理,并利用ELM对归一化的数据进行分类识别。最后,在AR人脸库上进行的仿真实验结果表明,所提方法对不同遮挡物和不同区域遮挡的图像具有较好的识别率和鲁棒性。 展开更多
关键词 人脸识别 遮挡 结构化遮挡编码 局部性约束字典 极限学习机
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分块多示例学习算法的目标跟踪
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作者 张华 杨岑玉 《控制工程》 CSCD 北大核心 2019年第1期23-28,共6页
为解决目标跟踪中的光照、位姿变化及遮挡问题,提出分块多示例学习算法。该算法将目标图像分块,对每块图像片应用多示例学习算法。跟踪过程中结合样本所有图像片的综合分类器分数和每块图像片的分类器分数检测并判断跟踪过程中的光照、... 为解决目标跟踪中的光照、位姿变化及遮挡问题,提出分块多示例学习算法。该算法将目标图像分块,对每块图像片应用多示例学习算法。跟踪过程中结合样本所有图像片的综合分类器分数和每块图像片的分类器分数检测并判断跟踪过程中的光照、位姿变化,及遮挡问题。针对不同的跟踪状态,采用分类器学习率自适应调整策略,以避免"过更新"及更新不及时的问题。最后将所提方法在典型视频序列中进行验证,并与其他多示例学习算法进行对比实验。实验结果表明所提方法跟踪性能稳定,实时性强,解决了跟踪过程中的光照、位姿变化及遮挡等问题。 展开更多
关键词 目标跟踪 遮挡 分块多示例学习算法 强分类器
椎动脉椎间段反向血流频谱在判断颈部血管病变部位中的应用价值 预览
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作者 吴治胜 唐琪 穆玉明 《广西医学》 CAS 2019年第15期1914-1916,共3页
目的探讨椎动脉间段反向血流频谱在判断颈部血管病变部位中的应用价值。方法83例明确诊断为椎动脉病变的患者,均行颈动脉彩色多普勒超声检查。所有患者椎动脉椎间段血流频谱呈反向。根据血管病变部位,将患者分为锁骨下动脉狭窄组61例和... 目的探讨椎动脉间段反向血流频谱在判断颈部血管病变部位中的应用价值。方法83例明确诊断为椎动脉病变的患者,均行颈动脉彩色多普勒超声检查。所有患者椎动脉椎间段血流频谱呈反向。根据血管病变部位,将患者分为锁骨下动脉狭窄组61例和椎动脉起始段闭塞组22例。观察患者椎动脉椎间段血流及频谱图像,比较两组患侧椎动脉血流速度及内径、对侧椎动脉血流频谱参数。结果锁骨下动脉狭窄组的患侧椎动脉椎间段血流频谱形态在收缩期及舒张期均表现为反向血流信号,椎动脉起始段闭塞组在收缩期表现为反向的低速血流信号,而在舒张期无血流信号。椎动脉起始段闭塞组患侧椎动脉收缩期及舒张期流速均慢于锁骨下动脉狭窄组(均P<0.05),两组对侧椎动脉血流频谱参数差异均无统计学意义(均P>0.05)。结论椎动脉椎间段反向血流频谱能够为快速寻找颈部血管病变部位提供重要线索。 展开更多
关键词 椎动脉 锁骨下动脉 颈部血管病变 狭窄 闭塞 内径 血流速度 椎间段 彩色多普勒超声 血流频谱 病变部位 诊断
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加权颜色粒子滤波与SIFT特征双融合的行人跟踪 预览
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作者 魏旭东 秦立峰 《计算机工程与设计》 北大核心 2019年第2期556-561,共6页
为改善粒子退化现象,提高粒子滤波算法对于遮挡目标的跟踪精度,提出加权颜色特征与SIFT特征双层融合的粒子滤波算法。用粒子的位置信息对传统粒子权重进行改进,作为内层融合,对SIFT点匹配跟踪框与粒子滤波跟踪框进行外融合,改善遮挡情... 为改善粒子退化现象,提高粒子滤波算法对于遮挡目标的跟踪精度,提出加权颜色特征与SIFT特征双层融合的粒子滤波算法。用粒子的位置信息对传统粒子权重进行改进,作为内层融合,对SIFT点匹配跟踪框与粒子滤波跟踪框进行外融合,改善遮挡情况下粒子退化的情况,提高跟踪精度。在VOT2014视频数据库上的实验结果表明,提出算法平均跟踪精度为95.03%,较传统粒子滤波算法提高了6个百分点。 展开更多
关键词 目标跟踪 遮挡 粒子滤波 SIFT点 算法融合 粒子退化
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Intravascular ultrasound-guided “extended” reverse controlled antegrade and retrograde subintimal tracking technique using a cutting balloon for recanalizing chronic coronary total occlusion with a side branch 预览
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作者 Yong-Tai GONG Jian-Qiang LI +2 位作者 Li SHENG Dang-Hui SUN Yue LI 《老年心脏病学杂志:英文版》 SCIE CAS CSCD 2019年第6期498-501,共4页
Percutaneous coronary intervention (PCI) of chronic total occlusion (CTO) represents the most technically challenging procedure in contemporary interventional cardiology.[1] Blunt lesions and presence of proximal side... Percutaneous coronary intervention (PCI) of chronic total occlusion (CTO) represents the most technically challenging procedure in contemporary interventional cardiology.[1] Blunt lesions and presence of proximal side branch are considered to be strong predictors of reduced technical success.[ 2,3] For such lesions, the antegrade approach may not be feasible or desirable, and the retrograde approach can be used as the initial crossing strategy. However, when treating the blunt CTO with a large side branch proximal to the occlusion, the side branch might be occluded after stent implantation if the retrograde guidewire passed the occluded segment through the subintimal space and re-entered into the true lumen at the opposite side of the side branch.[4] We reported a useful method to solve the above issue which utilizes intravascular ultrasound (IVUS) to guide “extended” reverse controlled antegrade and retrograde subintimal tracking (CART) technique with a cutting balloon. 展开更多
关键词 Chronic total OCCLUSION Cutting balloon INTRAVASCULAR ultrasound Percutaneous CORONARY intervention REVERSE controlled ANTEGRADE and RETROGRADE tracking technique
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Successful opening in-stent chronic total occlusion lesion of coronary artery by excimer laser coronary angioplasty 预览
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作者 Jing BAI Hai-Xia WANG +7 位作者 Jiang-Tao WANG Jing ZHAO Liang PENG Xue-Dong YANG Zhe TANG Shaheena Nazneen Gao-Kun WANG Yu WANG 《老年心脏病学杂志:英文版》 SCIE CAS CSCD 2019年第6期502-506,共5页
In percutaneous coronary intervention (PCI), chronic total occlusion (CTO) coronary artery disease still remains difficult to treat. One of the reasons for the failure is the hard of the CTO lesions that balloon is di... In percutaneous coronary intervention (PCI), chronic total occlusion (CTO) coronary artery disease still remains difficult to treat. One of the reasons for the failure is the hard of the CTO lesions that balloon is difficult to pass through or expand. Previous methods to deal with CTO lesions that cannot be passed by balloon, include selecting reinforced catheter (such as 5 in 6 guiding catheter, Guidzilla catheter, or Tornus microcatheter), guidewire extrusion or rotary grinding technology. In recent years, excimer laser coronary angioplasty (ELCA) has been gradually applied to CTO lesions. Using inert halide as the laser medium, ELCA emits a 308 nm high-intensity unidirectional light wave with absorption depth of only 50 μmL, resulting in less thermal effect and less damage to non-target lesions. In this paper, we will describe a successful PCI case of an in-stent CTO lesion using ELCA with long term coronary angiography follow-up. 展开更多
关键词 Chronic total OCCLUSION Drug coating BALLOON EXCIMER laser CORONARY ANGIOPLASTY Percutaneous CORONARY intervention
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症状性颅外段椎动脉长节段闭塞复合手术一例 预览
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作者 杨斌 马妍 焦力群 《中国脑血管病杂志》 CAS CSCD 北大核心 2019年第1期36-38,52共4页
回顾性分析1例症状性颅外段椎动脉长节段闭塞且规范药物治疗期间仍有反复后循环缺血发作患者的临床及影像学资料,探讨复合手术治疗症状性颅外段椎动脉长节段闭塞的优势。患者为72岁男性,主要临床表现为发作性眩晕伴行走不稳。既往MRI检... 回顾性分析1例症状性颅外段椎动脉长节段闭塞且规范药物治疗期间仍有反复后循环缺血发作患者的临床及影像学资料,探讨复合手术治疗症状性颅外段椎动脉长节段闭塞的优势。患者为72岁男性,主要临床表现为发作性眩晕伴行走不稳。既往MRI检查示双侧小脑急性脑梗死,规范药物治疗期间仍有后循环缺血反复发作。本次入院DSA示右侧椎动脉V1至V2段闭塞,甲状颈干分支通过肌支血管代偿V2段及以远椎动脉血供,左侧椎动脉末端纤细;MRI无创优化血管分析提示右侧椎动脉V3段及基底动脉血流量明显低于正常值下限。患者于全身麻醉下接受右侧椎动脉闭塞复合再通术治疗后椎动脉再通,后循环血流改善。18个月随访期间血流通畅,症状无复发。结合文献复习认为对于药物治疗无效的症状性颅外段椎动脉长节段闭塞而言,复合手术结合了手术和介入的优势而能取得更优的治疗效果,可能是安全有效的治疗方式。 展开更多
关键词 椎动脉 闭塞 症状性 复合手术
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The effect and safety of chronic total occlusion etrograded recanalization by epicardial collateral channel
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作者 周仪 钟志安 +3 位作者 黄泽涵 吴开泽 马墩亮 张斌 《岭南心血管病杂志:英文版》 CAS 2019年第1期37-43,共7页
Background Data on retrograde recanalization of epicardial collateral channels in patients with chronic total occlusion(CTO) undergoing percutaneous coronary intervention(PCI) are limited. Fearing about the complicati... Background Data on retrograde recanalization of epicardial collateral channels in patients with chronic total occlusion(CTO) undergoing percutaneous coronary intervention(PCI) are limited. Fearing about the complications of perforation, few CTO patients have chosen retrograde recanalization of epicardial collateral channels. Methods A retrospective analysis was conducted in this study. We followed up eligible patients who underwent continuous CTO via epicardial CCS from August 2011 to October 2018 in our center, and analyzed the detailed clinical baseline and angiographic data, surgical success rate and hospital complications to determine the efficacy and safety. The Cox model was used to compare major adverse cardiac events(MACE) and related co-variables between CTO patients with epicardial CCS perforation and non-perforated PCI patients. Results The study enrolled 191 patients with epicardial CCs PCI of CTO and the long term follow-up time was 24.03±19.18 months.Successful CCs PCI of CTO was achieved in 161(84.8 %) patients. Procedural collateral perforation occurred in23(12.0%) patients. MACEs occurred in 18 patients(9.4%) at 1-year follow-up. Kaplan-Meier curves showed no significant difference in MACEs between perforating recanalization of CCs PCI of CTO and non-perforating PCI of CTO.( adjusted hazard ratios(HR): 0.467;95% confidence intervals(CI): 0.13 to 1.69, P=0.245). The multivariate Cox regression analysis identified the Werner score=0/1(HR: 5.80;95% CI: 1.89 to 17.8;P=0.002) as significant independent predictors of perforation of CCs PCI of CTO. Conclusions The major complication of the procedure is collateral perforation. Recanalization of CTOs through epicardial collateral channel is safe and effective. It may be a available choice for recanalization of complex CTO. 展开更多
关键词 EPICARDIAL COLLATERAL CHANNEL chronic total occlusion COLLATERAL PERFORATION SAFETY and effective
遮挡图像分析及完形检测算法
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作者 莫丽莎 马惠敏 《电子测量与仪器学报》 CSCD 北大核心 2019年第4期10-18,共9页
针对复杂场景下现有的检测算法应对遮挡问题的鲁棒性不足的问题,建立了贯穿性截断遮挡模型及数据集、完成了遮挡对检测算法的影响分析且设计了一种抗遮挡目标检测算法。根据自然场景下的遮挡规律,提出了贯穿性截断遮挡模型来模拟真实遮... 针对复杂场景下现有的检测算法应对遮挡问题的鲁棒性不足的问题,建立了贯穿性截断遮挡模型及数据集、完成了遮挡对检测算法的影响分析且设计了一种抗遮挡目标检测算法。根据自然场景下的遮挡规律,提出了贯穿性截断遮挡模型来模拟真实遮挡;继而,以不同宽度、不同位置、不同朝向的灰条对无遮挡物体添加截断遮挡并建立了相应数据集,采用Fast R-CNN网络进行目标检测,并对检测结果完成可视化分析、IoU及其偏移量分析和候选区域遮挡前后MABO分数对比分析;依据分析实验结论和格式塔准则,设计提出了采取制定候选区域合并策略和设计基于一致性敏感哈希算法修复实现的抗遮挡目标检测算法框架。该框架的检测结果在建立的贯穿性截断遮挡数据集上与基线Fast R-CNN相比,平均准确率(mAP)取得了4.3%的提升。利用已知信息来推断被遮挡的未知信息建立的框架提升了目标检测算法应对遮挡现象的鲁棒性,对于遮挡干扰影响分析和抗遮挡检测算法的设计都具有重要指导意义。 展开更多
关键词 遮挡 目标检测 贯穿性截断遮挡 候选区域合并 粗糙修复
康柏西普联合光凝治疗视网膜分支静脉阻塞黄斑水肿
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作者 赵学军 张小鹏 张超玲 《中华眼外伤职业眼病杂志》 2019年第2期143-146,共4页
目的观察玻璃体内注射康柏西普联合光凝治疗缺血型视网膜分支静脉阻塞所致黄斑水肿的临床疗效。方法回顾性分析2014年6月至2018年4月在本院眼科缺血型视网膜分支静脉阻塞所致黄斑水肿48例(48眼)的临床资料,患者按住院顺序平均分为观察... 目的观察玻璃体内注射康柏西普联合光凝治疗缺血型视网膜分支静脉阻塞所致黄斑水肿的临床疗效。方法回顾性分析2014年6月至2018年4月在本院眼科缺血型视网膜分支静脉阻塞所致黄斑水肿48例(48眼)的临床资料,患者按住院顺序平均分为观察组和对照组,观察组行康柏西普联合视网膜激光光凝治疗,对照组直接行视网膜激光光凝治疗。观察两组治疗前及治疗后1周、1个月、3个月的最佳矫正视力、黄斑中心区视网膜厚度及并发症情况。结果观察组和对照组的视力和黄斑中心区视网膜厚度的差异在治疗后各时间点均有统计学意义(P<0.05)。结论玻璃体内注射康柏西普联合激光治疗缺血型视网膜分支静脉阻塞所致黄斑水肿可提高视力,减轻水肿,预防并发症的发生。 展开更多
关键词 阻塞 分支静脉 视网膜 水肿 黄斑 康柏西普 玻璃体内注射 光凝 激光
后部眼球筋膜下注射曲安奈德治疗黄斑水肿
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作者 杨倩倩 刘德成 +4 位作者 张金嵩 杨红伟 王彦 刘懿 许路加 《中华眼外伤职业眼病杂志》 2019年第4期306-309,共4页
目的探讨后部眼球筋膜下注射曲安奈德联合视网膜光凝治疗缺血性视网膜分支静脉阻塞(BRVO)所致黄斑水肿的临床效果。方法BRVO所致黄斑水肿60例(60眼)。行后部眼球筋膜下曲安奈德注射,1周后再行视网膜光凝。随访6个月进行观察。结果55例(9... 目的探讨后部眼球筋膜下注射曲安奈德联合视网膜光凝治疗缺血性视网膜分支静脉阻塞(BRVO)所致黄斑水肿的临床效果。方法BRVO所致黄斑水肿60例(60眼)。行后部眼球筋膜下曲安奈德注射,1周后再行视网膜光凝。随访6个月进行观察。结果55例(90.16%)视力提高,45例(75.20%)黄斑水肿明显减轻,未发生增生性玻璃体视网膜病变或新生血管性青光眼。结论后部眼球筋膜下曲安奈德注射联合视网膜光凝治疗缺血性视网膜分支静脉阻塞所致黄斑水肿可提高视力,促进水肿吸收,可预防继发新生血管性青光眼的形成。 展开更多
关键词 静脉阻塞 视网膜分支 黄斑水肿 曲安奈德 眼球筋膜囊下注射 后部 光凝术 激光
阳和健脾汤联合西医常规治疗下肢动脉硬化闭塞症疗效观察 预览
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作者 艾明瑞 冉宪俊 +4 位作者 王玉玲 王艳青 赵培 张淑芳 陈曦 《河北中医》 2019年第5期710-715,共6页
目的观察阳和健脾汤联合西医常规治疗下肢动脉硬化闭塞症(ASO)的疗效。方法将100例下肢ASO患者按照随机数字表法分为2组。对照组50例予西医常规治疗;治疗组50例在对照组治疗基础上予阳和健脾汤治疗。2组疗程均4周。比较2组治疗前后主观... 目的观察阳和健脾汤联合西医常规治疗下肢动脉硬化闭塞症(ASO)的疗效。方法将100例下肢ASO患者按照随机数字表法分为2组。对照组50例予西医常规治疗;治疗组50例在对照组治疗基础上予阳和健脾汤治疗。2组疗程均4周。比较2组治疗前后主观症状(疼痛、皮肤温度感、皮肤色泽)评分、客观指标及体征[踝肱指数(ABI)、经皮氧分压(TcPO2)、足背皮温、间歇性跛行距离]、足背动脉血流动力学参数(血管内径、血流量、峰值血流速度、搏动指数、阻力指数),并统计中西医临床疗效。结果治疗后2组各主观症状评分均降低(P<0.05),治疗组均低于对照组(P<0.05)。治疗后2组ABI、TcPO2及足背皮温均升高(P<0.05),间歇性跛行距离均延长(P<0.05),治疗组均高于对照组(P<0.05)。治疗后2组足背动脉血管内径、血流量、峰值血流速度、搏动指数、阻力指数均改善(P<0.05),且治疗组改善均优于对照组(P<0.05)。治疗组中医疗效总有效率(94.34%)优于对照组(82.97%,P<0.05)。治疗组西医疗效总有效率(86.79%)优于对照组(78.72%,P<0.05)。结论阳和健脾汤联合西医常规治疗下肢ASO疗效确切,能改善患者临床症状、体征,加快患肢血流速度。 展开更多
关键词 健脾 下肢 动脉硬化 闭塞性 中西医结合疗法
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改进的SAMF目标跟踪算法 预览
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作者 李大湘 吴玲风 +1 位作者 李娜 刘颖 《计算机工程》 CAS CSCD 北大核心 2019年第2期258-264,共7页
在基于视觉的目标跟踪过程中,当目标被遮挡时,跟踪算法精度往往下降。针对该问题,在SAMF跟踪算法基础上,提出一种基于图像分块重检测的改进算法。通过寻找最佳目标位置的方法优化SAMF算法,提高目标跟踪的准确率。利用图像分块及样本逐... 在基于视觉的目标跟踪过程中,当目标被遮挡时,跟踪算法精度往往下降。针对该问题,在SAMF跟踪算法基础上,提出一种基于图像分块重检测的改进算法。通过寻找最佳目标位置的方法优化SAMF算法,提高目标跟踪的准确率。利用图像分块及样本逐一测试的方法设计重检测模块,当目标因遮挡而无法稳定跟踪时,启动重检测模块,根据重检测后的最大响应值找出目标中心点,并引入模型自动更新策略对目标位置进行更新,避免出现跟踪漂移的现象。采用9个目标跟踪标准测试集进行对比实验,结果表明,该算法较SAMF算法平均距离精度提高了38%,且优于KCF、CN、CSK等其他目标跟踪算法。 展开更多
关键词 目标跟踪 相关滤波 重检测 遮挡 模型更新策略
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A11, a novel diaryl acylhydrazone derivative, exerts neuroprotection against ischemic injury in vitro and in vivo
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作者 Hong-xuan Feng Chun-pu Li +2 位作者 Shuang-jie Shu Hong Liu Hai-yan Zhang 《中国药理学报:英文版》 SCIE CAS CSCD 2019年第2期160-169,共10页
There is an urgent need to develop effective therapies for ischemic stroke, but the complicated pathological processes after ischemia make doing so difficult. In the current study, we identified a novel diaryl acylhyd... There is an urgent need to develop effective therapies for ischemic stroke, but the complicated pathological processes after ischemia make doing so difficult. In the current study, we identified a novel diaryl acylhydrazone derivative, A11, which has multiple neuroprotective properties in ischemic stroke models. First, A11 was demonstrated to induce neuroprotection against ischemic injury in a dose-dependent manner (from 0.3 to 3 μM) in three in vitro experimental ischemic stroke models: oxygen glucose deprivation (OGD), hydrogen peroxide, and glutamate-stimulated neuronal cell injury models. Moreover, A11 was able to potently alleviate three critical pathological changes, apoptosis, oxidative stress, and mitochondrial dysfunction, following ischemic insult in neuronal cells. Further analysis revealed that A11 upregulated the phosphorylation levels of protein kinase B (AKT) and extracellular signal-regulated kinase (ERK) in OGD-exposed neuronal cells, suggesting joint activation of the phosphoinositide 3-kinase (PI3K)/AKT and mitogen-activated protein kinase (MEK)/ERK pathways. In rats with middle cerebral artery occlusion, single-dose administration of A11 (3 mg/kg per day, i.v.) at the onset of reperfusion significantly reduced the infarct volumes and ameliorated neurological deficits. Our study, for the first time, reports the anti-ischemic effect of diaryl acylhydrazone chemical entities, especially A11, which acts on multiple ischemia-associated pathological processes. Our results may provide new clues for the development of an effective therapeutic agent for ischemic stroke. 展开更多
关键词 ischemic stroke NEUROPROTECTION diaryl ACYLHYDRAZONE oxygen glucose DEPRIVATION middle cerebral artery OCCLUSION protein KINASE B extracellular SIGNAL-REGULATED KINASE
Sectoral changes of the peripapillary choroidal thickness in patients with unilateral branch retinal vein occlusion
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作者 Na Eun Lee Hae Min Kang +2 位作者 Jeong Hoon Choi Hyoung Jun Koh Sung Chul Lee 《国际眼科杂志:英文版》 SCIE CAS 2019年第3期472-479,共8页
AIM: To investigate sectoral changes in the mean peripapillary choroidal thickness(PCT) in patients with unilateral branch retinal vein occlusion(BRVO). METHODS: This retrospective, interventional study included 41 pa... AIM: To investigate sectoral changes in the mean peripapillary choroidal thickness(PCT) in patients with unilateral branch retinal vein occlusion(BRVO). METHODS: This retrospective, interventional study included 41 patients with acute, unilateral BRVO without macular edema. All patients completed at least a 6-month follow-up period. The PCT was measured at eight locations(temporal, superotemporal, superior, superonasal, nasal, inferonasal, inferior, and inferotemporal). In addition to calculating the average of all locations, the peripapillary choroidal area was divided into four sectors: superior(average of superotemporal PCT, superior PCT, and superonasal PCT), temporal, inferior(average of inferotemporal PCT, inferior PCT, and inferonasal PCT), and nasal. RESULTS: In the BRVO-affected eyes, the mean PCT was 177.7±69.8 μm(range, 70.1-396.0 μm) at baseline and 127.8±54.8 μm(range, 56.4-312.1 μm) at 6 mo(P<0.001). In the non-affected contralateral eyes, the mean PCT was 192.5±60.6 μm(range, 61.4-365.0 μm) at baseline and 165.9±61.1 μm(range, 56.8-326.8 μm) at 6 mo(P<0.001). In sectoral analysis, the mean PCT in each sector was significantly reduced in over 6 mo in the BRVO-affected eyes(all P<0.001). In the non-affected contralateral eyes, the mean PCT was not significantly changed in any sector over the 6-month follow-up period(superior sector, P=0.143;temporal sector, P=0.825;inferior sector, P=0.192;and nasal sector, P=0.599).CONCLUSION: Sectoral analysis shows that the mean PCTs in all sectors are reduced significantly over 6 mo in the BRVO-affected eyes, but not in the non-affected contralateral eyes. 展开更多
关键词 branch RETINAL VEIN OCCLUSION CHOROID choroidal thickness peripapillary choroidal thickness
Optimal use of fielder XT guidewire enhances the success rate of chronic total occlusion percutaneous coronary intervention 预览
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作者 Qian-Cheng Wang Hai-Ruo Lin +8 位作者 Yuan Han Hai Dong Kai Xu Shao-Yi Guan Zhen-Huan Chen Hui-Xin Hao Jian-Ping Bin Yu-Lin Liao Quan-Min Jing 《世界临床病例杂志》 2019年第8期928-939,共12页
BACKGROUND Chronic total occlusion (CTO) is found in 18-31% of patients who undergo coronary angiography. Successful recanalization of CTOs is associated with reduced recurrent angina pectoris rates and increased long... BACKGROUND Chronic total occlusion (CTO) is found in 18-31% of patients who undergo coronary angiography. Successful recanalization of CTOs is associated with reduced recurrent angina pectoris rates and increased long-term survival. Although the success rate of CTO percutaneous coronary intervention (CTO-PCI) has improved, CTO-PCI remains technically challenging. The Fielder XT guidewire was designed for CTO lesions. To validate whether the use of the guidewire increases the success rate, we compared the results of CTO-PCI with or without the guidewire. We hypothesized that the use of Fielder XT guidewire can increase the success rate of CTO-PCI. AIM To investigate whether the use of Fielder XT guidewire increases the final procedural success of CTO-PCI via the anterograde approach. METHODS Between January 2013 and December 2015, a retrospective study was conducted on 1230 consecutive patients with CTO who received PCI via the anterograde approach at the General Hospital of Northern Theater Command. The patients were divided into an XT Group (n = 686) and a no-XT Group (n = 544) depending on whether Fielder XT guidewire was used. Both groups were compared for clinical parameters, lesion-related characteristics, procedural outcomes and in?hospital complications. The data were statistically analyzed using Pearson’s χ 2 test for categorical variables, and Students’ t test was used to compare the quantitative data. Significant independent factors and a risk ratio with 95% confidence interval (CI) were assessed by multivariate logistic regression analysis. RESULTS In total, 1230 patients were recruited;75.4% of the patients were male, and 55.8% of the patients were in the XT group. The overall success rate was 83.9%, with 87.8% in the XT group. Based on multivariate logistic regression analysis, factors positively associated with procedural success were the use of Fielder XT guidewire (P = 0.005, 95%CI: 1.172-2.380) and systolic blood pressure (P = 0.011, 95%CI: 1.003-1.022), while factors negatively associated w 展开更多
关键词 Chronic total OCCLUSION Percutaneous coronary intervention ANTEROGRADE WIRE ESCALATION Parallel WIRE technique Fielder XT GUIDEWIRE Success rate
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Five-year clinical outcomes of first-generation versus second-generation drug-eluting stents following coronary chronic total occlusion intervention 预览
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作者 Yong Hoon Kim Ae-Young Her +17 位作者 Seung-Woon Rha Byoung Geol Choi Se Yeon Choi Jae Kyeong Byun Yoonjee Park Dong Oh Kang Won Young Jang Woohyeun Kim Ju Yeol Baek Woong Gil Choi Tae Soo Kang Jihun Ahn Sang-Ho Park Ji Young Park Min-Ho Lee Cheol Ung Choi Chang Gyu Park Hong Seog Seo 《老年心脏病学杂志:英文版》 SCIE CAS CSCD 2019年第8期639-647,共9页
Background There are limited data comparing long-term clinical outcomes between first-generation (1G) and second-generation (2G) drug-eluting stents (DESs) in patients who underwent successful percutaneous coronary in... Background There are limited data comparing long-term clinical outcomes between first-generation (1G) and second-generation (2G) drug-eluting stents (DESs) in patients who underwent successful percutaneous coronary intervention (PCI) for coronary chronic total occlusion (CTO) lesion. Methods A total of 840 consecutive patients who underwent PCI with DESs for CTO lesion from January 2004 to November 2015 were enrolled. Finally, a total of 324 eligible CTO patients received 1G-DES (Paclitaxel-eluting stent or Sirolimus-eluting stent, n = 157) or 2G-DES (Zotarolimus-eluting stent or Everolimus-eluting stent, n = 167) were enrolled. The clinical endpoint was the occurrence of major adverse cardiac events (MACE) defined as all-cause death, recurrent myocardial infarction (re-MI), total repeat revascularization [target lesion revascularization (TLR), target vessel revascularization (TVR), and non-TVR]. We investigated the 5-year major clinical outcomes between 1G-DES and 2G-DES in patient who underwent successful CTO PCI. Results After propensity score matched (PSM) analysis, two well-balanced groups (111 pairs, n = 222, C-statistic = 0.718) were generated. Up to the 5-year follow-up period, the cumulative incidence of all-cause death, re-MI, TLR, TVR and non-TVR were not significantly different between the two groups. Finally, MACE was also similar between the two groups (HR = 1.557, 95% CI: 0.820–2.959, P = 0.176) after PSM. Conclusions In this study, 2G-DES was not associated with reduced long-term MACE compared with 1G-DES following successful CTO revascularization up to five years. 展开更多
关键词 Chronic total OCCLUSION DRUG-ELUTING STENT Outcomes
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血栓弹力图对急性脑梗死患者阿替普酶静脉溶栓后血管再闭塞的预测价值研究 预览
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作者 耿洋 郑加平 +3 位作者 王金涛 杨文 王海刚 李加梅 《世界最新医学信息文摘》 2019年第44期3-4,6共3页
目的通过分析急性脑梗死阿替普酶静脉溶栓患者的血栓弹力图,评价血栓弹力图相关参数对血管再闭塞的预测价值。方法选取急性脑梗死并给予阿替普酶静脉溶栓治疗的患者54例和同期健康查体者30例,根据患者美国国立卫生研究院卒中量表评分的... 目的通过分析急性脑梗死阿替普酶静脉溶栓患者的血栓弹力图,评价血栓弹力图相关参数对血管再闭塞的预测价值。方法选取急性脑梗死并给予阿替普酶静脉溶栓治疗的患者54例和同期健康查体者30例,根据患者美国国立卫生研究院卒中量表评分的变化分为持续好转组和再闭塞组并比较溶栓前及溶栓后2小时的血栓弹力图相关数值的变化。结果溶栓前,持续好转组R值较对照组小,α角、MA值较对照组大,差异具有统计学意义(P<0.05),再闭塞组R值较对照组小,α角较对照组大,差异具有统计学意义(P<0.05)。再闭塞组α角和MA值较持续好转组小,K值较持续好转组大,差异具有统计学意义(P<0.05)。溶栓后,两组患者K值较对照组大差异具有统计学意义(P<0.05),再闭塞组MA值较持续好转组大,差异具有统计学意义(P<0.05)。结论血栓弹力图有助于评估急性脑梗死阿替普酶静脉溶栓患者的凝血功能,对静脉溶栓后发生血管再闭塞的风险有重要预测价值。 展开更多
关键词 血栓弹力图 急性脑梗死 静脉溶栓 再闭塞 阿替普酶
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改进的KCF算法在车辆跟踪中的应用 预览
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作者 王林 胥中南 《计算机测量与控制》 2019年第7期195-199,共5页
针对核相关滤波算法(KCF)在复杂道路场景下难以应对因车辆尺度变化,遮挡及旋转而不能继续跟踪的问题,提出了一种新的跟踪方法来更好地实现复杂道路场景下的车辆跟踪;该方法借鉴快速分类尺度空间跟踪器(fDDST),采用一维尺度相关滤波器进... 针对核相关滤波算法(KCF)在复杂道路场景下难以应对因车辆尺度变化,遮挡及旋转而不能继续跟踪的问题,提出了一种新的跟踪方法来更好地实现复杂道路场景下的车辆跟踪;该方法借鉴快速分类尺度空间跟踪器(fDDST),采用一维尺度相关滤波器进行尺度估计;同时融合Kalman滤波器形成预测-跟踪-校准的跟踪机制;该机制结合遮挡处理能够保证系统在目标被严重遮挡时跟踪的准确性;在模型更新方面,在目标被遮挡时,自适应的调节学习率参数,及时纠正模型偏移、特征丢失等问题;实验结果表明,在复杂道路场景下车辆旋转、遮挡及尺度变化时,均能有效地跟踪目标车辆,且具有良好的鲁棒性。 展开更多
关键词 复杂背景 车辆跟踪 核相关滤波 kalaman滤波 尺度空间估计 遮挡
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后部眼球筋膜下注射曲安奈德联合光凝治疗黄斑水肿
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作者 杨红伟 杨倩倩 +1 位作者 刘德成 郭春峰 《中华眼外伤职业眼病杂志》 2019年第8期607-611,共5页
目的探讨后部眼球筋膜下注射曲安奈德联合激光光凝治疗视网膜中央静脉阻塞(CRVO)所致黄斑水肿的临床效果。方法回顾性分析2016年6月至2018年5月收治CRVO 60例(60眼)的临床资料。所有患者于后部眼球筋膜下注射曲安奈德后1周,行视网膜激... 目的探讨后部眼球筋膜下注射曲安奈德联合激光光凝治疗视网膜中央静脉阻塞(CRVO)所致黄斑水肿的临床效果。方法回顾性分析2016年6月至2018年5月收治CRVO 60例(60眼)的临床资料。所有患者于后部眼球筋膜下注射曲安奈德后1周,行视网膜激光光凝。结果治疗后6个月,57例(95.00%)视力提高,45例(75.00%)黄斑水肿明显减轻,无1例发生增生性玻璃体视网膜病变或新生血管性青光眼。结论后部眼球筋膜下注射曲安奈德联合激光治疗CRVO所致黄斑水肿可有效提高视力,促进视网膜出血、渗出及水肿吸收。 展开更多
关键词 阻塞 静脉 视网膜中央 水肿 黄斑 曲安奈德 注射 眼球筋膜下 后部 光凝 激光 视网膜
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