彩色多普勒血流显像对低压性青光眼的血流动力学研究

目的观察低压性青光眼血流动力学变化。方法应用彩色多普勒检测１５例正常人和１９例低压性青光眼（ｌｏｗ－ｔｅｎｓｉｏｎｇｌａｕｃｏｍａ，ＬＴＧ）的眼动脉、睫状后短动脉及视网膜中央动脉的血流参数。测定收缩期血流峰值速度（ｐｅａｋｓｙｓｔｏｌｉｃｆｌｏｗｖｅｌｏｃｉｔｙ，Ｖｍａｘ）、舒张末期血流速度（ｅｎｄｄｉａｓｔｏｌｉｃｆｌｏｗｖｅｌｏｃｉｔｙ，Ｖｍｉｎ）、平均血流速度（ｍｅａｎｅｎｖｅｌｏｐｅｄｖｅｌｏｃｉｔｙ，Ｖｍｅａｎ）、搏动指数（ｐｕｌｓｅｉｎｄｅｘ，ＰＩ）、阻力指数（ｒｅｓｉｓｔａｎｃｅｉｎｄｅｘ，ＲＩ）及收缩期血流峰值速度和舒张末期血流速度比值（Ｖｍａｘ／Ｖｍｉｎ，Ｓ／Ｄ）。结果（１）ＬＴＧ组睫状后短动脉血流速度低于正常人组（两组双眼Ｖｍａｘ、Ｖｍｉｎ及右眼Ｖｍｅａｎ比较，Ｐ＜０．０５），左眼ＲＩ及Ｓ／Ｄ低于正常人组（Ｐ＜０．０５）；（２）ＬＴＧ组左眼视网膜中央动脉血流的Ｖｍａｘ及Ｖｍｅａｎ低于正常人组（Ｐ＜０．０１）；（３）ＬＴＧ组与正常人组眼动脉血流的Ｖｍａｘ等６项参数比较，差异无显著性（Ｐ＞０．０５）。结论ＬＴＧ组的睫状后短动脉血流速度低于正常人组，支持ＬＴＧ视乳头损害的血管学说。     

彩色多普勒超声对中晚期青光眼患者眼动脉血流速度的测定

目的了解中、晚期青光眼患者眼动脉血流情况及血管因素在中、晚期青光眼患者视功能损害机制中的作用。方法采用彩色多普勒超声检查仪测定１５６例中、晚期青光眼患者的眼动脉血流速度，并与正常组７５例的有关参数值进行比较。结果正常组：平均最大收缩期血流速度（ｐｅａｋｓｙｓ－ｔｏｌｉｃｖｅｌｏｃｉｔｙ，ＰＳＶ）为３５．９８±９．１３ｃｍ／ｓ，舒张期眼动脉血流速度（ｅｎｄｄｉａｓｔｏｌｉｃｖｅｌｏｃｉｔｙ，ＥＤＶ）为１１．９８±３．９０ｃｍ／ｓ。开角型青光眼（ｐｒｉｍａｒｙｏｐｅｎａｎｇｌｅｇｌａｕｃｏｍａ，ＰＯＡＧ）组：ＰＳＶ为２４．１３±４．６５ｃｍ／ｓ，ＥＤＶ为７．１０±１．８５ｃｍ／ｓ，闭角型青光眼（ｐｒｉｍａｒｙｃｌｏｓｅａｎｇｌｅｇｌａｕｃｏｍａ，ＰＣＡＧ）组：ＰＳＶ为２２．８９±５．４３ｃｍ／ｓ，ＥＤＶ为７．０６±１．９２ｃｍ／ｓ。各组间ＰＳＶ与ＥＤＶ比较：ＰＯＡＧ组与ＰＣＡＧ组间差异无显著性（Ｐ＞０．０５），青光眼组与正常组间差异有非常显著性（Ｐ＜０．０１）。结论中、晚期青光眼患者因眼动脉血流速度下降明显，导致局部血液循环障碍。青光眼患者的视功能损害与视神经的血供不足关系密切。     

糖尿病患者的眼动脉和视网膜中央动脉血流动力学改变

目的 应用彩色多普勒显像（ｃｏｌｏｒ Ｄｏｐｐｌｏｒ ｆｌｏｗ ｉｍａｇｉｎｇ,ＣＤＦＩ）检测糖尿病患者,以探讨其血液动力学变化,提供有参考价值的数据。方法 应用ＣＤＦＩ检测了３０例糖尿病患者和５０例正常对照组的眼动脉（ｏｐｈ－ｔｈａｌｍｉｃ ａｒｔｅｒｙ,ＯＡ）、视网膜中央动脉（ｃｅｎｔｒａｌ ｒｅｔｉｎａｌ ａｒｔｅｒｙ,ＣＲＡ）的收缩期血流峰速（ｐｅａｋ ｓｙｓｔｏｌｉｃ ｖｅｌｏｃｉｔｙ,     

彩色多普勒对视网膜静脉阻塞血流动力学分析

目的 探讨视网膜静脉阻塞（ＲＶＯ）血流动力学改变。方法 经散瞳眼底检查及眼底荧光血管造影确诊为ＲＶＯ病例５２例,健康对照组５２例,使用Ａｃｕｓｏｎ １２８ＸＰ／ １０型彩色电脑声像仪,测定也视网膜中央动脉（ＣＲＡ）、中央静脉（ＣＲＶ）及眼动脉（ＯＡ）的收缩期最大血流速度（Ｖｍａｘ）、舒张期末最小血流速度（Ｖｍｉｎ）及阻力指数（ＲＩ）。结果 ＲＶＯ患者ＣＲＶ和Ｖｍａｘ及Ｖｍｉｎ均明显低于健眼（Ｐ〈０．     

经颅多普勒超声观察单侧重度颈内动脉狭窄时眼动脉血流改变

目的　通过经颅多普勒超声（ｔｒａｎｓｃｒａｎｉａｌＤｏｐｐｌｅｒ,ＴＣＤ）对单侧重度颈内动脉狭窄（ｉｎｔｅｒｎａｌｃａｒｏｔｉｄａｒｔｅｒｙｓｔｅｎｏｓｉｓ,ＩＣＡＳ）的患者进行眼动脉血流的检测,观察眼动脉血流与眼部缺血性疾病及颈内动脉狭窄程度的关系。方法　将经颈动脉彩色多普勒超声检查确诊为单侧重度ＩＣＡＳ的３１例及颈内动脉完全闭塞的１９例患者纳入研究。利用ＴＣＤ检查ＩＣＡＳ侧眼动脉血流方向、收缩期峰值血流速度（ｐｅａｋｓｙｓｔｏｌｉｃｖｅｌｏｃｉｔｙ,ＰＳＶ）及阻力指数（ｒｅｓｉｓｔａｎｃｅｉｎｄｅｘ,ＲＩ）,对比分析眼动脉逆向血流（ｒｅ-ｖｅｒｓｅｄｏｐｈｔｈａｌｍｉｃａｒｔｅｒｙｆｌｏｗ,ＲＯＡＦ）患眼及对侧眼眼动脉ＰＳＶ及ＲＩ值,同时对眼动脉血流方向与眼部缺血以及ＩＣＡＳ程度的关系进行分析。结果　经ＴＣＤ检查发现ＲＯＡＦ２４眼,其中单侧重度ＩＣＡＳ者９眼,颈内动脉完全闭塞者１５眼,ＲＯＡＦ在颈内动脉完全闭塞组更易出现,差异有统计学意义（χ２＝１１．７６,Ｐ＝０．００１）。２４例ＲＯＡＦ患者的阻塞侧ＰＳＶ值为（３８．６８±１１．５８）ｃｍ?ｓ－１,与健侧的（３３．５３±２．７４）ｃｍ?ｓ－１相比差异有统计学意义（ｔ＝２９．７３,Ｐ＝０．０００）;阻塞侧ＲＩ值为０．６０±０．１０,与健侧的０.７８±０.１０相比差异有统计学意义（ｔ＝－６．２０,Ｐ＝０．０００）。２４只ＲＯＡＦ眼中５８．３％有明确的眼部缺血体征,而２６只正流患侧眼中该比例为１５．４％,ＲＯＡＦ组患眼更容易出现眼部缺血体征（χ２＝９．９９,Ｐ＝０．００２）。利用Ｌｏｇｉｓｔｉｃ回归预测ＲＯＡＦ与眼部缺血的关系:回归系数为０．２１１（χ２＝１２．２６,Ｐ＝０．０００）,ＯＲ值为１．２３５。结论　当出现ＲＯＡＦ时,提示重度ＩＣＡＳ甚至完全闭塞;ＲＯＡＦ的流速越快,提示眼部出现缺血性病变的几率越大。     

利用彩色多普勒成像技术对正常人眼部血流动力学的研究

目的：应用彩色多普勒成像（ｃｏｌｏｒＤｏｐｐｌｅｒｉｍａｇｉｎｇ，ＣＤＩ）技术作正常人眼部血流动力学研究。方法：用ＣＤＩ测量９０例（１８０只眼）正常人眼动脉（ｏｐｈｔｈａｌｍｉｃａｒｔｅｒｙ，ＯＡ），视网膜中央动脉（ｃｅｎｔｒａｌｒｅｔｉｎａｌａｒｔｅｒｙ，ＣＲＡ），睫状后动脉（ｐｏｓｔｅｒｉ－ｏｒｃｉｌｉａｒｙａｒｔｅｒｙ，ＰＣＡ）的血流参数，分析其与影响因素间关系。结果：ＯＡ，ＣＲＡ，ＰＣＡ的收缩期、舒张期血流速度分别为（单位ｃｍ／ｓ）：３１．７±１０．９，７．２±２．６；１０．２±３．４，２．８±１．２；１１．３±３．６，３．２±１．４。ＯＡ血流参数与年龄呈负相关，与红细胞计数，红血球压积呈正相关，与性别、眼别、正常范围眼压无关。正常眼部动脉血管的正常频谱形态为近似三角形，三峰双切迹，呈高阻波形，搏动指数和阻力指数均较高，各频带宽度基本相同，无明显频窗。结论：ＣＤＩ的眼部应用可为了解眼及其供应血管的血流动力学情况奠定基础。     

彩色多普靳血流显像对中晚期青光眼的眼血流动力学研究

目的：观察中晚期青光眼患者的眼血流动力学变化、了解血管因素在中晚期青光眼患者视功能损害机制中的作用。方法：应用彩色多普靳检测２０例（４０只眼）正常人和２１例（４２只眼）中晚期青光眼的眼动脉、睫状后短动脉及视网膜中央动脉的血流参数。测定收缩期峰值速度（Ｐｅａｋ Ｓｙｓｔｏｌｉｃ Ｖｅｌｏｃｉｔｙ，ＰＳＶ），舒张末期速度（Ｅｎｄ Ｄｉａｓｔｏｌｉｃ Ｖｅｌｏｃｉｔｙ，ＥＤＶ），计算其阻力指数（Ｒｅｓｉ     

视网膜脱离成功复位1年以上患眼低视力与黄斑区脉络膜厚度的关系

目的　使用深部增强成像频域光学相干断层扫描（ｅｎｈａｎｃｅｄｄｅｐｔｈｉｍａｇｉｎｇｓｐｅｃｔｒａｌｄｏｍａｉｎｏｐｔｉｃａｌｃｏｈｅｒｅｎｃｅｔｏｍｏｇｒａ-ｐｈｙ,ＥＤＩＳＤ-ＯＣＴ）观察孔源性视网膜脱离成功复位１ａ以上低视力患眼黄斑中心凹下脉络膜厚度（ｓｕｂｆｏｖｅａｌｃｈｏｒｏｉｄａｌｔｈｉｃｋｎｅｓｓ,ＳＦＣＴ）,分析其与低视力的关系。方法　将南昌爱尔眼科医院２０１０年１月到２０１４年３月孔源性视网膜脱离成功复位术后１ａ以上最佳矫正视力（ｂｅｓｔｃｏｒｒｅｃｔｅｄｖｉｓｕａｌａｃｕｉｔｙ,ＢＣＶＡ）＜０．３的患者７２例（７２眼）纳入研究。行双眼ＢＣＶＡ及ＥＤＩＳＤ-ＯＣＴ扫描ＳＦＣＴ检查。分析患眼与对侧健眼术后末次随访的ＢＣＶＡ与ＳＦＣＴ的相关性。结果　患眼术后末次随访ＳＤ-ＯＣＴ检查显示,７２眼中,黄斑中心凹正常者３眼（４．２％）;外层视网膜微结构异常者６９眼（９５．８％）。患眼术后末次随访ＢＣＶＡ,转换为５分记录视力为３．５９±０．５１,同期健眼为４．９４±０．１１;患眼术后末次随访ＳＦＣＴ为（１６４．４７±６２．９５）μｍ,对侧健眼ＳＦＣＴ为（２３５．４７±４２．４０）μｍ;患眼与对侧健眼术后末次随访ＢＣＶＡ、ＳＦＣＴ差异均有统计学意义（均为Ｐ＜０．０５）。患眼术后末次随访ＢＣＶＡ与ＳＦ-ＣＴ有相关性（Ｐ＜０．０５）。患眼黄斑区外层视网膜微结构异常眼与正常眼的ＢＣＶＡ、ＳＦＣＴ差异均无统计学意义（均为Ｐ＞０．０５）。结论　孔源性视网膜脱离成功复位术后１ａ以上低视力眼的ＳＦＣＴ薄,且与ＢＣＶＡ存在相关性;其视力的恢复可能要晚于ＥＤＩＳＤ-ＯＣＴ下观察到的外层视网膜微结构的恢复。     

视网膜中央静脉阻塞的彩色超声多普勒检查

采用彩色超声多普勒成象技术对１０例视网膜中央静脉阻塞患者进行视多膜中央动、静脉的血流测定，并选择１０例性别、年龄相当的正常健康人进行对照。结果显示：患眼的视网中央动脉收缩期峰值血流速度（ＰＳＶ）和加速度（Ａ），平均视网膜中央静脉以速（ＣＲＶ）较对侧健肯和正常对照明显降低，而且ＣＲＶ较ＰＳＶ降低明显，提示ＣＲＶ的测量可能在鉴别缺血型与非缺血型视网膜中央静脉阻塞以及预测新生血管并发症的产生方面有一定意     

高度近视眼血流动力学检测

运用彩色多普勒成像（ｃｏｌｏｒｄｏｐｐｌｅｒｉｍａｇｉｎｇ，ＣＤＩ）技术，测量了２３例高度近视眼、２０例轻中度近视眼、１８例正常眼的眼动脉（ｏｐｈｔｈａｌｍｉｃａｒｔｅｒｙ，ＯＡ）、后睫状动脉（ｐｏｓｔｃｉｌｉａｒｙａｒｔｅｒｙ，ＰＣＡ）及视网膜中央...     

彩色多普勒成像技术检测视网膜静脉阻塞眼血流动力学的变化

目的探讨视网膜静脉阻塞(retinal vein occlusion,RVO)患者视网膜中央动脉(central retinal artery,CRA)和视网膜中央静脉(central retinal vein,CRV)血流动力学特征及其意义。方法使用ATL-HDI3000彩色多普勒诊断仪，检测RVO患者患眼48只、对侧临床健康眼39只及正常对照眼40只的CRA收缩期峰值血流速度(peak systolic velocity,PSV)、舒张末期血流速度(end diastolic velocity,EDV)和血管搏动指数(pulsatility index,PI)，CRV最大血流速度(maximun velocity，Vmax)。结果RVO患眼、对侧临床健康眼CRA的PSV和EDV均显著低于正常对照眼，RVO患眼PI显著高于正常对照眼；RVO患眼CRA的PSV显著低于RVO对侧临床健康眼，RVO患眼PI显著高于RVO对侧临床健康眼；RVO患眼、对侧临床健康眼CRV的Vmax均显著低于正常对照眼。结论RVO患眼和对侧临床健康眼血流动力学异常。彩色多普勒成像技术可作为其早期诊断的重要手段。(中华眼底病杂志,1998,14:111-113)     

Agreement among three examiners of colour Doppler imaging retrobulbar blood flow velocity measurements

Purpose: To assess the agreement among three masked examiners on central retinal artery (CRA) and ophthalmic artery (OA) blood flow velocity measurements performed with colour Doppler imaging (CDI) in healthy volunteers. Methods: The study included 30 eyes of 15 healthy volunteers. Prior to the study, all examiners underwent intensive CDI training by an expert to facilitate uniformity in performing measurements according to a specific protocol. Following the eligibility visit, three masked examiners performed CDI measurements assessing the CRA and OA in both eyes of all subjects. All CDI images were analysed by a masked grader. Intraclass correlation coefficients (ICC) were calculated for peak systolic velocity (PSV) and end diastolic velocity (EDV) in the CRA and OA among the examiners. p‐values < 0.05 were considered statistically significant. Results: The study included seven men and eight women (mean age 30.9 ± 4.5 years). In right eyes, ICCs for PSV and EDV in the CRA ranged from 0.917 to 0.961 and from 0.937 to 0.980, respectively. ICCs for PSV and EDV in the OA ranged from 0.802 to 0.926 and from 0.611 to 0.891, respectively. In left eyes, all ICCs for PSV and EDV were >0.9, both in the CRA and the OA. All p‐values calculated for ICCs were statistically significant. Conclusion: Expert training and execution of a specific protocol for CDI of ocular blood flow velocity measurements provide highly reproducible results in healthy volunteers. This is important for long‐term studies assessing ocular hemodynamics, where multiple examiners may be involved.     

Orbital color Doppler imaging in Behçet’s disease with or without ocular involvement

Purpose

To investigate the value of color Doppler imaging (CDI) of orbital vasculature in the assessment of ocular involvement in patients with Behçet’s disease (BD) without clinical ophthalmologic abnormalities.

Methods

CDI of the orbital vessels were performed on 26 eyes of 13 patients who were diagnosed as having BD with ocular involvement (group 1), 65 eyes of 33 patients who had BD without ocular involvement (group 2) and 40 eyes of 20 healthy volunteers (group 3). Peak systolic (PSV) and end-diastolic (EDV) blood flow velocities and resistivity index (RI) measurements were obtained for the ophthalmic artery (OA) and central retinal artery (CRA). The mean velocity of the central retinal vein (CRV) was also measured.

Results

For the OA, PSV and EDVs were significantly lower and RIs were significantly higher in group 2 than in control subjects. In group 1, only the EDVs of OA were significantly lower than in healthy subjects. For the CRA, PSV and EDVs were significantly lower, and RIs were significantly higher in both BD groups than those in group 3. When group 1 and group 2 were compared, the differences between PSV, EDV and RI measurements for the CRA and OA were statistically insignificant. There was no significant difference in blood flow velocity of the CRV between the three groups.

Conclusion

Major hemodynamic changes were observed in the ophthalmic vasculature of Behçet’s patients with or without ocular involvement by CDI. CDI may detect ocular blood flow alterations before initial clinical manifestations.

     

快速眼压波动对大鼠眼部血流动力学的影响

目的 观察快速眼压波动对大鼠眼部血流动力学的影响。方法 建立快速眼压波动Sprague-Dawley大鼠模型。其眼压在1 s内由12 mm Hg(1 mm Hg=0.133 kPa)下降至0 mm Hg,2 min后于1 s内由0 mm Hg上升至12 mm Hg。采用裂隙灯图像分析系统拍摄大鼠眼压12 mm Hg及0 mm Hg时眼前节像,测量虹膜血管管径直径。眼压变化前,变化后5、10、20、60 s,采用彩色多普勒超声诊断仪检测大鼠视网膜中央动脉(CRA)和视网膜中央静脉(CRV)的血流动力学变化。测定峰值血流速度(PSV)、舒张期末流速( EDV)、平均血流速度(MV)、阻力指数(RI)、搏动指数(PI)和血管内径(VD)。结果 大鼠眼压为12 mm Hg时,其虹膜血管直径为(28.30±5.80) μm;大鼠眼压为0 mm Hg时,其虹膜血管直径为(59.80±6.40) μm;两者比较,差异有统计学意义（t=8.98,P＜0.01）。眼压快速下降时,大鼠虹膜血管、CRA和CRV的VD立即扩大;PSV、EDV和MV立即升高,然后缓慢下降;RI和PI立即下降;眼压变化后不同时间点各项指标比较,差异均有统计学意义(P＜0.01)。眼压快速升高时,大鼠虹膜血管、CRA和CRV的VD立即缩小,PSV、EDV和MV立即下降,RI和PI立即升高;眼压变化后不同时间点各项指标比较,差异均有统计学意义(P＜0.01)。结论 快速眼压波动可引起大鼠眼部血流动力学的急剧波动变化。     

Topical latanoprost and optic nerve head and retinal circulation in humans.

The purpose of the present study was to study the effect of a single instillation of latanoprost on the human optic nerve head (ONH) and retinal circulation. Using laser-speckle tissue blood flow analysis, normalized blur (NB; a quantitative index of tissue blood velocity) was measured every 0.125 sec at a temporal ONH site free of visible surface vessels. Measurements were averaged for 3 cardiac cycles (NB(ONH)). Color Doppler Imaging (CDI) was also used to evaluate peak systolic blood velocity (PSV), endo-diastolic velocity (EDV), and resistive index (RI) in the central retinal artery (CRA) and mean blood velocity (MV) in the central retinal vein (CRV). One drop of 0.005% latanoprost was instilled into one eye and its vehicle into the other in eleven healthy volunteers in a double-blinded manner. Measurements of bilateral NB(ONH), CDI parameters, intraocular pressure (IOP), blood pressure (BP), and pulse rate (PR) were performed before, and 45, 90, 180, and 270 min after instillation. After a single instillation of latanoprost or the vehicle, there was no significant bilateral difference throughout the experimental period. The difference in NB(ONH) between that before and at each time point of measurement (delta NB(ONH)) in the latanoprost-treated eyes was significantly higher between 45 and 270 min after instillation than that in vehicle-treated eyes (P = 0.0003 to 0.0156); ANOVA for repeated measurements also revealed significant difference between both eyes (P < 0.00001). BP, PR, and NB(ONH) in the eye that received only the vehicle, PSV, EDV, and RI in the CRA in both eyes, and MV in the CRV in both eyes changed little. Tissue blood velocity in the ONH increased at least temporarily following a single instillation of topical latanoprost. Although the mechanism of the increase is unclear, the effects of latanoprost on ONH tissue circulation in humans may have clinical implications.     

视网膜脱离患者球后血液动力学的研究

目的观测视网膜脱离(RD)患者的球后血流动力学。方法原发性视网膜脱离(RD)患者60例, 按部分性RD25只眼;完全性RD22只眼;完全性RD伴PVR-C级以上15只眼分为三组,共62只眼。对照组38例, 共58只眼。彩色多普勒超声指导下,采用脉冲多普勒超声检测眼动脉(OA)、视网膜中央动脉(CRA)、睫状后动脉 (PCA)收缩期(PSV)、舒张期(ESV)、平均血流速度(AV)及阻力指数(RI)、搏动指数(PI)。结果三组RD患者与对照组的OA血流速度无明显差异(P>0．05);CRA、PCA的PSV、EDV、AV血流速度均减低(P<0．01);PI、RI值无显著性差异(P>0．05);且随着RD病情的加重各血流指标减低的更为明显,但组间差异无显著性(P>0．05)。结论视网膜脱离患者的血流动力学变化直接影响到视网膜的微循环状态,这为视网膜脱离的病理机制研究及药物辅助治疗提供了有力依据。     

Retrobulbar hemodynamic parameters in pseudoexfoliation syndrome and pseudoexfoliative glaucoma

OBJECTIVE: To compare the hemodynamic parameters in the retrobulbar vessels in pseudoexfoliative syndrome (PXS), pseudoexfoliative glaucoma (PXG), and age-matched healthy subjects by using color Doppler imaging (CDI). SUBJECTS AND METHODS: 72 eyes from 72 patients with PXS, 70 eyes from 70 patients with PXG, and 66 eyes from 66 age-matched healthy subjects who met the inclusion/exclusion criteria were included in this prospective cross-sectional study. Peak systolic velocity (PSV), end-diastolic velocity (EDV), and Pourcelot resistance index (RI) were assessed in the ophthalmic artery (OA), central retinal artery (CRA), and temporal short-posterior ciliary arteries (SPCA). Visual function was assessed using the 24-2 Swedish Interactive Threshold Algorithm (SITA). The main outcomes of the study were PSV, EDV and RI in the OA, SPCA, and CRA. RESULTS: The EDV in the OA, SPCA and the CRA was decreased significantly (p < 0.001, <0.001, and 0.003 respectively) in the eyes of PXG patients compared with controls and PSX respectively. The RI in the OA, SPCA, and the CRA was significantly higher (p = 0.022, 0.005, and 0.007 respectively) in the eyes of PXG patients compared with healthy controls and PSX patients respectively. The mean difference in mean EDV in the OA between the control group and the PXS was 0.18 cm/s, 95% confidence interval (CI) -0.60 to 0.95, p = 0.661. The mean difference in mean EDV in the SPCA between the control healthy subjects and the pseudoexfoliative subjects was -0.18 cm/s, 95% CI -0.45 to 0.08, p = 0.176. Multivariate regression analysis showed that in the PXG patients the PSV and EDV in the CRA were significantly positively correlated with the mean defect (p = 0.006 and 0.002 respectively). The RI in the CRA was significantly negatively correlated with the mean defect in PXG patients, p = 0.009. CONCLUSION: The results of this study showed that the retrobulbar hemodynamics might be disturbed in patients with PXG, especially in the central retinal artery. Our results have found no significant differences in the retrobulbar hemodynamic parameters between pseudoexfoliative syndrome patients and age-matched healthy subjects.     

Correlation Between Higher Blood Flow Velocity in the Central Retinal Vein than in the Central Retinal Artery and Severity of Nonproliferative Diabetic Retinopathy

Purpose

To assess the correlation between a higher blood flow velocity in the central retinal vein (CRV) than in the central retinal artery (CRA) and the severity of nonproliferative diabetic retinopathy (non-PDR).

Methods

We evaluated both eyes of 20 non-PDR patients with higher peak systolic velocity (PSV) in the CRV than in the CRA unilaterally as determined by color Doppler imaging (CDI). The eyes with higher PSV in the CRV were placed in group D2-H, and the fellow eyes were placed in group D2-L. The stage of non-PDR was determined by the guidelines of the Early Treatment Diabetic Retinopathy Study. Normal subjects and non-PDR patients without higher PSV in the CRV were evaluated as CDI controls.

Results

Advanced non-PDR (P = 0.001) and cystoid macular edema (P = 0.02) were statistically more frequent in group D2-H. The velocities in the ophthalmic artery and the short posterior ciliary artery were not statistically different among all groups. The velocities in the CRA were similar in all non-PDR groups and significantly lower than in the normal subjects (P < 0.05). The velocities in the CRV were significantly higher only in group D2-H (P < 0.001).

Conclusion

Higher PSV in the CRV than in the CRA was significantly correlated with the severity of non-PDR, especially in the presence of cystoid macular edema.?Jpn J Ophthalmol 2006;50:312–317 © Japanese Ophthalmological Society 2006