基于OCTA的近视性屈光参差患者黄斑区血流密度及视网膜厚度分析

目的　应用光学相干断层扫描血管成像(optical coherence tomography angiography,OCTA)观察近视性屈光参差患者黄斑区血流密度及视网膜厚度的改变。方法　应用OCTA对20例近视性屈光参差患者双眼的黄斑区视网膜进行扫描,受试者按双眼眼轴相对长度分为两组,眼轴较长眼进入长眼轴组,另一眼则进入对侧眼组,对比两组患者黄斑区血流密度及视网膜厚度情况。结果　在20例成年近视性屈光参差患者中,黄斑区整体浅层视网膜的血液密度长眼轴组为47.04%±3.10%,明显高于对侧眼组的44.12%±2.67%,差异有统计学意义（P<0.001)。等效球镜度数与黄斑区整体浅层视网膜血流密度及浅层旁黄斑中心凹血流密度均呈负相关(r=-0.18、-0.21,P=0.021、0.015)。两组所有深层视网膜的黄斑区血流密度及黄斑区视网膜厚度比较,差异均无统计学意义(均为 P>0.05)。长眼轴组和对侧眼组的黄斑区脉络膜血流灌注面积分别为（1.94±0.17）mm²和（1.90±0.19）mm²,两组黄斑中心凹无血管区面积分别为（0.27±0.07）mm²和（0.28±0.07）mm²,差异均无统计学意义(均为 P>0.05)。结论　在近视性屈光参差患者中,长眼轴眼黄斑区浅层视网膜血流密度明显高于对侧眼;等效球镜度数与整体黄斑区浅层视网膜血流密度和浅层旁中心凹血流密度均呈负相关。     

量化OCTA在视网膜静脉阻塞中的应用

目的:应用光学相干断层扫描血管成像技术(OCTA)测量视网膜静脉阻塞(RVO)患者黄斑区血流密度、黄斑中心凹无血管区(FAZ)面积和黄斑中心凹视网膜厚度。方法:选取RVO患者30例30眼,视网膜中央静脉阻塞(CRVO)和视网膜分支静脉阻塞(BRVO)患者各15例,双眼接受OCTA检查,获取黄斑中心3mm×3mm大小范围的血流密度、FAZ面积、黄斑中心凹视网膜厚度,以及双眼最佳矫正视力(BCVA)。比较患眼与健眼上述指标的变化及其与BCVA的相关性。结果:CRVO患者患眼黄斑区视网膜浅层毛细血管网(SVN)、深层毛细血管网(DVN)总血流密度较健眼降低[SVN:(43.07±4.95)%vs(50.09±2.86)%,DVN:(45.89±4.12)%vs(53.29±2.62)%,均P<0.01],与BCVA呈负相关(r_s=-0.6、-0.5,均P<0.05)。BRVO患者患眼SVN、DVN总血流密度较健眼降低[SVN:(45.62±3.04)%vs(52.10±2.98%),DVN:(49.21±3.80)%vs(55.52±3.33%),均P<0.01],与BCVA呈负相关(r_s=-0.5、-0.5,均P<0.05)。BRVO患眼病变区域与患眼未病变区域、健眼对应区域比较,SVN、DVN血流密度均下降(均P<0.01);患眼未病变区域DVN血流密度较健眼相应区域下降[(56.86±1.95)%vs(58.15±2.24)%,P=0.02];患眼病变区域DVN血流密度与BCVA呈负相关(r_s=-0.6,P=0.01)。CRVO、BRVO患眼SVN的FAZ面积较健眼明显扩大(CRVO:0.515±0.26mm²vs 0.27±0.08mm²,P<0.01;BRVO:0.376±0.12mm²vs 0.261±0.07mm²,P<0.01),且均与BCVA呈正相关(CRVO:r_s=0.6,P=0.01;BRVO:r_s=0.5,P=0.01)。CRVO、BRVO患眼黄斑中心凹视网膜厚度均较健眼增加(CRVO:431.2±191.3μm vs 235.5±18.2μm,P<0.01;BRVO:373.2±188.7μm vs 233.8±13.7μm,P=0.01),均与BCVA呈正相关(CRVO:r_s=0.9,P=0.01;BRVO:r_s=0.6,P=0.01)。结论:OCTA可作为测量RVO患者黄斑区血流密度、FAZ面积及黄斑中心凹视网膜厚度的有效工具。     

基于OCTA的白内障超声乳化术后黄斑区视网膜厚度和血管密度分析

目的　利用光学相干断层扫描血管成像（optical coherence tomography angiography,OCTA）评估白内障超声乳化术后黄斑区视网膜厚度和血管密度的改变。方法　纳入47例（57眼）白内障患者,分别在白内障超声乳化术前及术后1周、1个月和3个月使用OCTA检查患眼黄斑中心凹、黄斑中心凹旁、黄斑中心凹周边视网膜厚度和黄斑区视网膜浅层、深层的微血管密度以及黄斑中心凹无血管区（foveal avascular zone,FAZ）面积的变化。结果　与术前相比,术后1个月和3个月黄斑中心凹、黄斑中心凹旁和黄斑中心凹周边视网膜全层厚度均显著增加（均为P<0.05）,主要表现在内层视网膜的增加上。术后1周、1个月、3个月,黄斑中心凹旁及黄斑中心凹周边视网膜浅层血管密度与术前相比差异均无统计学意义（均为P>0.05）,仅术后1个月视网膜深层黄斑中心凹周边血管密度显著高于术前（P<0.05）。术后1个月和3个月黄斑FAZ面积分别为（0.42±0.23)mm²和（0.34±0.17)mm²,显著低于术前的（0.73±0.91)mm²,差异均有统计学意义（均为P<0.05）。结论　白内障超声乳化术后患者黄斑区视网膜厚度增加以及FAZ面积降低,黄斑中心凹周边视网膜血管密度无明显改变。     

扫频源OCTA对系统性红斑狼疮患者黄斑区脉络膜厚度及微循环改变的评估

目的利用扫频源光学相干断层扫描血管成像(OCTA)技术探讨系统性红斑狼疮(SLE)患者黄斑区脉络膜厚度及脉络膜微血管形态的早期变化特征。方法采用横断面研究方法, 纳入2022年1—7月就诊于河北省人民医院风湿免疫科、无明显眼部症状的SLE患者37例37眼作为SLE组, 同时纳入与病例组年龄、性别相匹配的正常成年人35例35眼作为对照组。采用扫频源OCT对受试者进行黄斑区9 mm×9 mm放射状扫描, 获得受试者黄斑中心凹区域、旁中心凹区域(1～3 mm)、中心凹周围区域(3～6 mm)的平均脉络膜厚度。采用OCTA对受试者进行黄斑区3 mm×3 mm扫描, 获得黄斑区视网膜浅层毛细血管丛(SCP)和深层毛细血管丛(DCP)血流密度、脉络膜毛细血管丛(CC)血流密度及微血管血流图像, 采用Image J软件对脉络膜毛细血管血流图像进行二值化处理(Phansalkar法)并计算脉络膜毛细血管流空区域面积(FDa)及百分比(FD%)。结果 SLE组黄斑中心凹区域平均脉络膜厚度为(268.73±81.67)μm, 较对照组的(230.14±68.14)μm明显增厚, 差异有统计学意义(t=2....     

OCTA在DR患者黄斑血流密度观察中的应用

目的:应用光学相干断层扫描血管成像技术(optical coherence tomography angiography,OCTA)观察糖尿病视网膜病变(diabetic retinopathy,DR)患者黄斑血流密度的改变和临床意义.方法:收集28例47眼DR患者纳入研究组(DR组),依据DR国际临床分期标准将DR患眼分为两组,其中非增殖组(NPDR组)19例30眼和增殖组(PDR组)11例17眼.取年龄相匹配的27例46眼健康眼作为对照组.所有入选受试者均应用OCTA对黄斑区视网膜行3mm×3mm范围模式扫描,获得4个层面黄斑血流密度图,同时测量3个层面黄斑血流密度,包括表层视网膜层、深层视网膜层和脉络膜毛细血管层.结果:DR组表层视网膜、深层视网膜及脉络膜层毛细血管层黄斑血流密度分别为0.4963±0.0840、0.4798±0.0801、0.5290±0.0528;其中NPDR组分别为0.5064±0.0843、0.4983±0.0766、0.5345±0.0529,而PDR组分别为0.4786±0.0830、0.4473±0.0778、0.5192±0.0526;正常对照组分别为0.5919±0.0704、0.6301±0.0527、0.5691±0.0169.对照组分别和NPDR组、PDR组、DR组表层视网膜、深层视网膜、脉络膜毛细血管层的黄斑血流密度比较,差异有显著统计学差异(P<0.001).NPDR组和PDR组之间黄斑血流密度在深层视网膜比较,差异有统计学意义(P=0.029),但在表层视网膜、脉络膜毛细血管层比较,差异无统计学意义(P=0.236、0.268).结论:DR患者黄斑血流密度在表层视网膜、深层视网膜和脉络膜毛细血管层均较正常对照组下降,提示黄斑区视网膜及脉络膜均存在缺血现象.OCTA可以量化黄斑血流变化的情况,为早期监测糖尿病的进展、发现DR提供有效手段.     

超高度近视患者后巩膜加固术后眼底形态的变化

目的 探讨超高度近视患者行后巩膜加固术后眼底形态的变化。方法 选取2016年5月至2017年8月南昌市第一医院眼科医院收治的行后巩膜加固术的超高度近视患者11例21眼作为研究对象。术后随访24～39个月,检测并记录患者最佳矫正视力(BCVA)、眼轴长度、视盘面积、Bruch膜孔面积、γ区长度、中心凹距视盘颞侧边缘距离、视网膜厚度、脉络膜厚度以及近视性视网膜病变(血管旁病变、视网膜劈裂)情况等。结果 21眼术后末次随访BCVA(logMAR)为4.2～5.0(4.78±0.26),与术前比较差异无统计学意义(P>0.05);末次随访眼轴长度为27.24～33.64(30.49±2.39)mm,与术前相比,术后眼轴增长(0.38±0.34)mm(P<0.05)。21眼术前及术后末次随访视盘面积分别为(2.99±0.96)mm²、(2.84±1.12)mm²(P>0.05),Bruch膜孔面积分别为(7.79±6.65)mm²、(8.12±6.76)mm²(P>0.05),γ区长度...     

高度近视眼黄斑区神经纤维层厚度分布特点及其与血流密度的关系

目的：研究高度近视眼黄斑区神经纤维层厚度和血流密度的分布特点并分析其相关因素。

方法：收集高度近视患者20例40眼,年龄为29.90±7.92岁,等效球镜屈光度为 -8.95±2.01 D。采用光学相干断层扫描血管成像技术(OCTA)测量黄斑区神经纤维层厚度,获取视网膜浅层毛细血管层、视网膜深层毛细血管层及脉络膜毛细血管层的血流分布图像并计算各层血流密度。直径6 mm的黄斑区分为9个亚区域：黄斑中心凹区,旁中心凹区和中心凹外区各自分为上方、下方、鼻侧和颞侧4个象限。比较黄斑不同亚区域的神经纤维层厚度的差别,分析其与屈光度、眼轴、各层血流密度的关系。

结果：旁中心凹区的4个象限中,上方神经纤维厚度最低,下方神经纤维厚度最高(均P<0.05)。中心凹外区4个象限中颞侧神经纤维厚度最低(均P<0.05)。中心凹外区上方神经纤维层厚度与屈光度存在负相关(r= -0.356,P=0.024)。视网膜浅层毛细血管层的血流密度与旁中心凹区鼻侧和下方象限,以及中心凹外区上方、鼻侧和下方象限的神经纤维层厚度呈正相关(r=0.314、0.408、0.467、0.655、0.737,均P<0.05); 脉络膜毛细血管层血流密度与中心凹外区的上方象限呈负相关(r=-0.356,P=0.024)。

结论：高度近视眼黄斑区神经纤维层具有各象限不均匀分布特点。随着屈光度的增加,局部神经纤维层变薄,并且存在区域特异性,部分区域神经纤维层厚度的变化与视网膜浅层毛细血管丛及脉络膜毛细血管层的血流密度相关。     

应用光学相干断层扫描血管成像（OCTA）评估糖尿病患者早期黄斑区视网膜微循环

目的　应用光学相干断层扫描血管成像（optical coherence tomography angiography,OCTA）观察糖尿病患者早期黄斑中心凹无血管区（foveal avascular zone,FAZ）面积和黄斑区血流密度（macular vascular density,MVD）的改变及其临床意义。方法　回顾性病例研究。收集33例46眼糖尿病患者纳入研究,依据糖尿病视网膜病变国际临床分期标准将患眼分为两组,其中无糖尿病视网膜病变（no-diabetic retinopathy,NDR）组13例20眼和非增生期糖尿病视网膜病变（nonproliferative diabetic retinopathy,NPDR）组20例26眼。另选取年龄相匹配的26人（40眼）健康者作为对照组。所有受试者均接受OCTA对黄斑区视网膜行3 mm×3 mm 范围的模式扫描,获得4个层面黄斑血流密度图,同时测量FAZ面积和MVD。结果　NDR组和NPDR组FAZ面积分别为（0.392±0.028）mm²、（0.410±0.019）mm²,与对照组（0.314±0.025）mm²相比差异均有统计学意义（均为P=0.000）;NDR组和NPDR组之间的FAZ面积比较,差异有统计学意义（P=0.010）。NDR组和NPDR组的表层视网膜、深层视网膜、外层视网膜及脉络膜毛细血管层的MVD分别是0.500±0.012、0.553±0.007、0.393±0.005、0.651±0.006和0.484±0.012、0.522±0.007、0.397±0.007、0.642±0.007,与对照组（0.518±0.014、0.572±0.008、0.385±0.005、0.666±0.007）比较,差异均有统计学意义（均为P=0.000）;NDR组和NPDR组表层视网膜、深层视网膜及脉络膜毛细血管层MVD比较,差异均有统计学意义（均为P=0.000）,但两组外层视网膜MVD比较,差异无统计学意义（P=0.065）。结论　应用OCTA检查提示糖尿病患者早期黄斑区视网膜的微循环障碍,且随着病情的进展而变化。     

光学相干断层扫描血管成像技术（OCTA）观察孔源性视网膜脱离复位术后黄斑区血流

目的　通过光学相干断层扫描血管成像技术（optical coherence tomography angiography,OCTA）观察孔源性视网膜脱离患者视网膜复位术后黄斑区血流情况。方法　对单眼行孔源性视网膜脱离复位术患者进行术后随访。将患眼纳入试验组,将对侧健眼纳入对照组。在患者视网膜复位稳定6个月时使用OCTA对双眼黄斑区进行3 mm×3 mm大小成像,分别计算试验组与对照组浅层视网膜毛细血管（superficial capillary plexus,SCP）层黄斑中心凹无血流管区（foveal avascular zone,FAZ）面积、SCP层和深层视网膜毛细血管（deep capillary plexus,DCP）旁中心凹血流密度及中央视网膜厚度（central retinal thickness,CRT）。对比观察两组眼部血流参数信息,分别评估两组SCP层FAZ面积与CRT的相关性。结果　本研究纳入21例单眼孔源性视网膜脱离复位术后患者。试验组SCP层旁中心凹血流密度为39.50%±7.10%,相比对照组的44.11%±5.72%更小（P=0.026）。试验组CRT为（211.95±30.37）μm,相比对照组的（252.38±15.63）μm更薄（P<0.001）。试验组SCP层FAZ面积、DCP层旁中心凹血流密度分别为（0.34±0.10）mm²、47.67%±9.13%,与对照组的（0.30±0.01）mm²、49.70%±6.10%相比,差异均无统计学意义（均为P>0.05）。两组SCP层FAZ面积与CRT均存在显著负相关（试验组:r=-0.450,P=0.041;对照组:r=-0.527,P=0.014）。结论　孔源性视网膜脱离复位术后患眼黄斑区血流发生显著改变,OCTA观察视网膜脱离复位术后患眼血流有利于监测视网膜结构和功能变化。     

不同分层、不同区域增生型糖尿病视网膜病变患眼视网膜毛细血管无灌注区的分布特征:基于全域SS-OCTA的研究

目的　采用全域扫频源光相干断层扫描血管成像（SS-OCTA）探讨不同分层、不同区域增生型糖尿病视网膜病变（PDR）患眼视网膜毛细血管无灌注区（NPA）的分布特征。方法　将2021年12月至2022年1月在潍坊医学院附属医院眼科确诊的PDR患者21例（26眼）纳入本研究。采用图湃（北京）医疗科技有限公司生产的BM-400K行全域SS-OCTA检查,采集患者视网膜浅层毛细血管层（SCP）和深层毛细血管层（DCP）图像。每层均按照两种方法分区:（1）以黄斑中心凹中点为圆心分为不同的圆环区域,以中央直径1 mm的圆为黄斑中心凹无血管区,直径1~<3 mm为最内环,3~<6 mm为内环,6~<10 mm为中环,≥10 mm至视网膜边界为外环（由于最内环毛细血管是相连的无缝网络且被重叠灌注,不易形成NPA,因此本次主要检测和比较内环、中环和外环的NPA）;（2）以黄斑中心凹中点作水平线和垂直线,将视网膜分为颞上、颞下、鼻上、鼻下四个象限。分别测量内环、中环、外环及四个象限的NPA面积并计算缺血指数（ISI）,比较PDR患眼SCP、DCP不同圆环区域和不同象限的NPA面积和ISI,分析NPA分布特征。结果　PDR患眼DCP NPA总面积［（124.340±54.971）mm²］大于SCP［（119.119±55.279）mm²］,DCP 总ISI（0.423 0±0.187 0）大于SCP总ISI（0.405 0±0.188 0）,差异均有统计学意义（均为P<0.001）。SCP、DCP外环NPA面积大于中环,中环大于内环,差异均有统计学意义（均为P<0.05）;SCP、DCP外环ISI大于中环,中环大于内环,差异均有统计学意义（均为P<0.05）。SCP、DCP颞下象限NPA面积大于鼻上象限,差异均有统计学意义（均为P<0.05）,其余象限比较,差异均无统计学意义（均为P>0.05）;SCP、DCP颞下象限ISI大于鼻上象限,差异均有统计学意义（均为P<0.05）,其余象限比较,差异均无统计学意义（均为P>0.05）。结论　PDR患眼视网膜NPA分布不均衡,在DCP、外环和颞下象限具有更多的NPA。     

视网膜血管管径测量方法的进展及其影响因素

视网膜血管是人体唯一肉眼可见的血管,通过评价视网膜微血管病变的程度可提示系统性微血管病变的状况。本文介绍视网膜血管管径测量方法的进展及其影响因素。     

Oclusión arterial asociada con un asa vascular prepapilar. Cambios anatómicos en el seguimiento a largo plazo

We report the case of a 13-year-old patient who complains of an acute superior visual field scotoma in the last 48 hours. Best corrected visual acuity (BCVA) was 20/20 in both eyes. The right eye fundus examination revealed torsion of a prepapillary loop in the inferior branch of the retinal artery, associated with a arterial vascular attenuation and whitenning of the inferior retina that involved both nasal and temporal branches but spared the foveal region. During the follow-up the vascular loop dissapeared and only glial tissue was seen in front of the optic nerve head. BCVA remained 20/20 in both eyes.This report shows the evolution of the vascular loop after an occlusion. The absence of blood flow produces a collapse of the arterial walls, in time the vascular loop is replaced by glial tissue.     

Inhibition of proliferation of retinal vascular endothelial cells more effectively than choroidal vascular endothelial cell proliferation by bevacizumab

AIM: To evaluate the differential inhibitory effects of bevacizumab on cell proliferation of vascular endothelial growth factor (VEGF)-stimulated choroidal vascular endothelial cells (CVECs) and retinal vascular endothelial cells (RVECs) in vitro. METHODS: VEGF (400 ng/mL) enriched CVECs and RVECs were treated with escalating doses of bevacizumab (0.1, 0.5, 1, 1.5 and 2 mg/mL). Cell proliferation changes were analyzed with WST-1 assay and trypan blue exclusion assay at 48, 72h and 1wk. Morphological changes were recorded with bright field microscopy. RESULTS: VEGF enriched RVECs showed significantly more decline of cell viability than CVECs after bevacizumab treatment. One week after treatment, RVEC cell proliferation decreased by 29.7%, 37.5%, 52.8%, 35.9% and 45.6% at 0.1, 0.5, 1.0, 1.5 and 2 mg/mL bevacizumab respectively compared to CVEC proliferation decrease of 4.1%, 7.7%, 2.4%, 4.1% and 17.7% (P<0.05) by WST-1 assay. Trypan blue exclusion assay also revealed similar decrease in RVEC proliferation of 20%, 60%, 73.3%, 80% and 93.3% compared to CVEC proliferation decrease of 4%, 12%, 22.9%, 16.7% and 22.2% respectively (P<0.05). The maximum differential effect between the two cell types was observed at bevacizumab doses of 1.0 and 1.5 mg/mL at all time points. RVECs were 22 fold more sensitive (P<0.01) compared to CVECs (52.8% vs 2.4%) at concentration of 1.0 mg/mL, and 8.7 fold more at 1.5 mg/mL (35.9% vs 4.1%) 1wk after treatment (P<0.05 respectively). CONCLUSION: VEGF-enriched RVECs are more susceptible to bevacizumab inhibition than CVECs at clinically used dosage of 1.25 mg and this differential sensitivity between two cell types should be taken into consideration in dosage selection.     

Measurement of vasoactivity in the guinea-pig choroid

Purpose: A perfusion system for studying the vasoactive properties of the guinea-pig choroid is described. Methods :The principle of operation is that the vascular resistance of the entire vascular network of an isolated, perfused eye can be monitored by recording the pressure required to deliver a constant flow of perfusate through the network. Delivery of the pharmacological agent of interest into the perfusate stream and the subsequent determination of the magnitude of any induced pressure changes allows the vasoactive potency of various agonists to be assessed. Results: The baseline vascular resistance was 1.35 ± 0.16 mmHg. min/μL (mean ± SEM; n=10) and the mean response to intraluminal delivery of 124 mmol/L K⁺ Krebs was an increase in resistance of 297±67%. Vasoactive responses were sustainable for more than 8 h. Conclusions: This system will now be used to study the vasoactive properties of the guinea-pig choroid in greater detail.     

Retinal blood vessels develop in response to local VEGF-A signals in the absence of blood flow

The role of hemodynamic forces and other signals from circulating blood in guiding the development of the retinal vasculature was examined by following the growth of these vessels in organ cultures. Retinal vascular development in organ cultures was monitored by immunofluorescent staining of retinal whole-mounts using antibodies against ICAM-2, a specific marker for endothelial cells and by vascular adenosine disphosphatase activity. Under culture conditions, the retinal vasculature from mice at postnatal day 3 (P3) grew from the optic nerve area to the edge of the retina in a manner similar to that observed in vivo. Both inner and outer vascular plexuses formed in retinal explants. Within the first few days of organ culture, the initial uniform meshwork of blood vessels was reorganized into arterioles, venules, and capillaries. As in animals, the initial retinal vascular plexus contained abundant vessels, and afterward some vessels regressed leading to the formation of a mature vascular bed. Changes in vascular density due to blood vessel growth and remodeling were confirmed by RT-PCR and Western blot analyses of ICAM-2 mRNA and protein levels, respectively. In addition, during in vitro retinal vascularization, arterioles acquired mural cell coverage, as shown by positive staining for alpha-smooth muscle actin. Thus, blood flow and blood-derived signals were not required for the development and maturation of retinal vessels. In contrast, stability of blood vessels in retinal explants was tightly regulated by endogenous levels of vascular endothelial growth factor-A (VEGF-A). VEGF-A was expressed in the explants throughout the culture period, and addition of neutralizing antibodies against VEGF-A to the organ culture caused a severe regression of blood vessels from the vascular front toward the optic nerve. In contrast, addition of anti-FGF-2 antibodies had no effect on the developing vasculature. Thus, retinal vascular development is dependent on local VEGF-A signals rather than systemic signals.     

糖尿病视网膜病变患者血浆VEGF和CAMS水平的变化及其临床意义

目的探讨糖尿病视网膜病变患者血浆血管内皮细胞生长因子（vascular endothelial growth factor，VEGF）和细胞黏附分子（cellular adhesion molecules，CAMS）水平的变化及其临床意义。方法采用ELISA法检测58例糖尿病视网膜痛变（diabetic retinopathy，DR）患者血浆VEGF、可溶性细胞间黏附分子-1（soluble intercellular adhesion molecule，sICAM—1）和可溶性血管细胞间黏附分子-1（soluble vascular cellular adhesion molecule，sVCAM-1）的变化，并与非糖尿痛视网膜病变（non—diabetic retinopathy，NDR）患者进行比较。结果糖尿病患者血浆VEGF和sICAM—1、sVCAM—1明显高于对照组，差异有显著性（t’=28．581，20．765，t=19．667，P〈0．001）；DR患者血浆VEGF和sICAM—1、sVCAM—1明显高于NDR患者。差异有显著性（t=11．358～16．025，P〈0．001）；PDR患者VEGF和sICAM-1、sVCAM-1明显高于NPDR患者，差异有显著性（t=5．941～14．547，P〈0．001）。NPDR和PDR患者血浆VEGF与siCAM—1、sVCAM—1呈明显的正相关（r=0.617～0．720。P〈0．01）。结论血浆VEGF和sICAM-1、sVCAM—1水平变化参与了DR的发生与发展，且与病变程度有关。     

双丹明目胶囊对糖尿病大鼠模型视网膜VEGF家族表达的影响

目的：观察双丹明目胶囊对糖尿病大鼠模型视网膜VEGF家族因子VEGF-a、VEGF-b、VEGF-c蛋白表达的影响。

方法：将40只雄性SD大鼠,采用随机数字法分为A空白组、B模型组、C双丹明目组、D阳性对照组4组,每组10只20眼。将B、C、D三组实验大鼠采用STZ 50mg/kg的剂量一次性大鼠尾静脉注射法建立糖尿病视网膜病变大鼠模型,造模后1wk开始连续灌胃用药,灌胃后4wk,处死动物,免疫组化法检测视网膜组织中VEGF-a、VEGF-b、VEGF-c的表达。

结果：成模后用药第4wk,模型组、双丹明目组、阳性对照组视网膜中VEGF-a、VEGF-b、VEGF-c蛋白表达平均灰度值均低于正常组,平均光密度均高于正常组,其中模型组与正常组比较,差异均具有统计学意义(P<0.01); 双丹明目组、阳性对照组VEGF-a、VEGF-b、VEGF-c表达的平均灰度值均高于模型组(P<0.05),平均光密度值均低于模型组(P<0.01)。

结论：双丹明目胶囊能明显降低VEGF家族中VEGF-a、VEGF-b、VEGF-c在糖尿病模型大鼠视网膜中的表达,对其视网膜有一定的保护作用。     

Effects of resveratrolon Proliferationof retinal vascular endothelial cells and exPressionof VEGF

To studythe effectsof resveratrolonthe Proliferationof human retinal vascular endothelial cells(RVEC) induced by cobalt chloride-simulated hyPoxia in vitro. METHODS: CoCl2(100μmol/L) was usedto simulate hyPoxic condition, and human RVEC were cultured in vitro as model.the cell Proliferation was determined by MTT method; SABC method was emPloyedtotestthe exPressionof vascular endothelial growth factor(VEGF); and comPuter image analyzer was usedto Process data.the effectsof resveratrolonthe Proliferationof vascular endothelial cells wereobserved. RESULTS: Resveratrol inhibitedthe Proliferationof human RVEC induced by CoCl₂ in a dose- andtime-dePendent manner in vitro, meanwhile VEGF exPression in all grouPs which were administered medicine was down-regulated. Both kindsof inhibitive effectsof resveratrol were statistically significant (P <0.01). CONCLUSION：Resveratrol can significantly inhibitthe Proliferationof human RVEC andthe exPressionof VEGF, which may Provide a new aPProach for Prevention andtreatmentof retinal neovascular diseases. "