Blood-aqueous barrier disruption in experimental anterior segment ischemia in rabbit eyes

The blood-aqueous barrier (BAB) in experimentally induced anterior segment ischemia (ASI) following strabismus or retinal detachment surgery in pigmented rabbits was evaluated by laser flare photometry. Four simultaneous rectus tenotomies produced a significantly higher flare value on the 1st postoperative day. Obstruction of one or two vortex veins produced significantly high flare values on the 1st and 3rd postoperative days. Scleral buckling with interference of one vortex vein produced a higher flare value than that with buckling alone. Interference of three vortex veins by diathermy and the encircling procedure produced serious ASI. Disruption of BAB in ASI can be detected quantitatively with laser flare photometry. Introduction of prostaglandin synthetase inhibitor resulted in a significant reduction of flare values following surgery. Prostaglandin synthetase inhibitor can partly ameliorate BAB disruption.     

Relationship between blood-aqueous barrier disruption and ischemic macular edema in patients with branch or central retinal vein occlusion: effects of sub-tenon triamcinolone acetonide injection.

PURPOSE: The aim of this study was to study the effects of the sub-Tenon triamcinolone acetonide (STA) injection on ischemic cystoid macular edema (CME) or macular edema (ME) and blood-aqueous barrier (BAB) disruption associated with branch or central retinal vein occlusion (BRVO or CRVO). METHODS: Prior to, and 1, 2, 3, and 4 months after, STA injection, central retinal thickness was measured by using optical coherence tomography and the amount of aqueous flare by using laser flare metry. RESULTS: In the BRVO group treated by STA, the amount of flare was significantly less at 1, 2, and 3 months after injection than in the untreated BRVO group (P < 0.05). In the CRVO group treated by STA, the amount was significantly less at 1 month after injection than in the untreated CRVO group (P < 0.05). In the BRVO group with STA treatment, central retinal thickness was significantly less at 1 and 2 months after the treatment than in the untreated BRVO group (P < 0.05). In the CRVO group with STA treatment, the thickness was significantly less at 1 month after treatment than in the untreated CRVO group (P < 0.05). A correlation test revealed the amount of aqueous flare and the central retinal thickness to be well correlated (P < 0.01). CONCLUSIONS: The effects of STA and its time course on CME or ME correlated well with those on BAB disruption. Since there is the close correlation between the BAB and blood-retinal barrier function, the effects of medical treatment on ME associated with BRVO or CRVO can be evaluated by means of the BAB function.     

Randomized clinical trial of cryotherapy versus laser photocoagulation for retinopexy in conventional retinal detachment surgery

PURPOSE: To investigate whether the method of retinopexy influences the visual recovery rate and the breakdown of the blood-ocular barrier after conventional retinal detachment surgery. METHODS: Forty-eight patients (48 eyes) with primary rhegmatogenous retinal detachment entered into the study. All eyes were phakic, had an attached macula, and were scheduled for conventional scleral buckling surgery. Patients were randomly assigned to have either laser or cryotherapy for retinopexy. All visual acuity and flare measurements were performed by a masked observer. The interventional procedure was cryopexy at the time of scleral buckling surgery or postoperative (4 weeks) laser photocoagulation. Visual acuity testing with ETDRS chart and aqueous flare measurement with laser flare photometry were performed by a masked observer at standard intervals: preoperatively and 1 day, 7 days, 4 weeks, and 10 weeks postoperatively. Analysis of covariance by multiple linear regression was used for statistical evaluation. RESULTS: Postoperative flare values from patients receiving cryotherapy were significantly higher at each measurement point in time (P < or =.001). The visual recovery was slower in the patients receiving cryotherapy (1 week, P =.003; 4 weeks, P =.03; 10 weeks, P =.081). CONCLUSION: Laser flare photometry proved sufficiently sensitive to quantify an increase in aqueous flare after limited external retinal cryotherapy. Postoperative flare, as a measure of blood-ocular barrier breakdown, was significantly higher and visual recovery slower in the cryotherapy group. Visual acuity after 10 weeks was not significantly different between both groups.     

光凝和冷凝在孔源性视网膜脱离复位术中的对比应用

目的:比较光凝和冷凝在视网膜脱离复位术中的临床应用。方法:回顾分析2007-02/2009-08简单孔源性视网膜脱离复位术中应用术后光凝封闭裂孔42眼及术中冷凝封闭裂孔39眼的临床效果。结果:光凝组一次手术复位率为100%,冷凝组一次手术复位率为94.9%。术后视力改善光凝组为37眼(88%),冷凝组为29眼(74%),两组对视力的改善差异无统计学意义(P>0.05)。结论:巩膜外垫压联合术后激光也是治疗简单孔源性视网膜脱离的一种简单、有效的手术方式。     

光凝和冷凝封闭裂孔治疗原发性视网膜脱离的临床观察

目的评价激光光凝和冷凝封闭裂孔治疗原发性(孔源性)视网膜脱离的临床效果。方法回顾性分析2001年1月至2005年10月我科在巩膜扣带术后采用532nm激光经瞳孔光凝封闭裂孔的光凝组38例(38只眼)和冷凝封闭裂孔的冷凝组40例(40只眼)的原发性视网膜脱离的临床资料,随访6~12个月。结果出院时光凝组和冷凝组视网膜复位率无明显差异(P>0.05);随访期光凝组视网膜复位率、视力改善情况、PVR逆转率明显优于冷凝组(P<0.01)。结论巩膜扣带术后激光光凝封闭裂孔可减轻视网膜色素上皮的释放和血-视网膜屏障的破坏,逆转PVR的进程,减少术后复发率,是治疗原发性视网膜脱离的一种有效方法。     

光凝与冷凝在孔源性视网膜脱离手术中的比较

目的　观察两种视网膜脱离手术的疗效并进行比较。方法　回顾分析 2 0 0 1年～ 2 0 0 2年因视网膜脱离行手术治疗的 30例病人。其中一组手术方式为巩膜扣带术联合术后激光治疗 ,另外一组为冷凝加巩膜扣带术 ,随访时间为 3个月至 1年。结果　两组视网膜复位率均为 88.6 7% ,差异无显著性 (P >0 .0 5 )。结论　巩膜扣带术联合术后激光治疗是治疗孔源性视网膜脱离的一种可行的方法 ,其疗效等同于传统的冷凝加巩膜扣带术。     

Quantitative assessment of the integrity of the blood-retinal barrier in mice

PURPOSE: The purpose of this study was to develop and characterize a quantitative assay of blood-retinal barrier (BRB) function in mice and to determine the effect of several purported vasopermeability factors on the BRB. METHODS: Adult C57BL/6J mice were treated with three regimens of increasingly extensive retinal cryopexy and subsequently were given an intraperitoneal injection of 1 microCi/g body weight of [(3)H]mannitol. At several time points, the amount of radioactivity per milligram tissue was compared in retina, lung, and kidney. Time points that maximize signal-to-background differential in the retina were identified, and the ratio of counts per minute (CPM) per milligram retina to CPM per milligram lung (retina-to-lung leakage ratio, RLLR) or kidney (retina-to-renal leakage ratio, RRLR) were calculated. This technique was then used to compare the amount of BRB breakdown that occurs after intravitreous injection of vascular endothelial growth factor (VEGF), insulin-like growth factor (IGF)-1, prostaglandin (PG) E(1), PGE(2), interleukin (IL)-1beta, or tumor necrosis factor (TNF)-alpha. RESULTS: Twenty-four hours after retinal cryopexy, there was a higher level of radioactivity in treated than in control retinas, and the signal-to-background difference was optimal when measurements were obtained 1 hour after injection of [(3)H]mannitol. In untreated mice, the RLLR was 0.30 +/- 0.02 and the RRLR was 0.22 +/- 0.01. Twenty-four hours after one 5-second application of retinal cryopexy, the RLLR was 0.73 +/- 0.20 and the RRLR was 0.71 +/- 0.23. With increasing amounts of cryopexy, there was an increase in the RLLR and RRLR, so that after two 10-second applications, the RLLR was 1.66 +/- 0.31 and the RRLR was 1.47 +/- 0.20. Intravitreous injection of VEGF, IGF-1, PGE(1), PGE(2), IL-1beta, or TNF-alpha each caused significant increases in the RLLR and RRLR, but there were some differences in potency and time course. VEGF caused prominent BRB breakdown at 6 hours that returned to near normal by 24 hours. IL-1beta also caused relatively rapid breakdown of the BRB, but its effect was more prolonged than that caused by VEGF. There was delayed, but substantial breakdown of the BRB after injection of TNF-alpha. IGF-1, PGE(2), and PGE(1) caused less severe, relatively delayed, and more prolonged BRB breakdown. CONCLUSIONS: Measurement of the RLLR or RRLR after intraperitoneal injection of [(3)H]mannitol in mice provides a quantitative assessment of BRB function that is normalized and can therefore be compared from assay to assay. Comparison of the extent and duration of BRB breakdown after intravitreous injection of vasoactive substances shows that agents can be grouped by resultant extent and time course of leakage. Additional studies are needed to determine whether this grouping has its basis in shared mechanisms of BRB disruption.     

Symptomatic retinoschisis-detachment involving the macula

We treated three patients (four eyes) in whom posteriorly situated retinoschisis-detachments became symptomatic because of elevation of a limited area of full-thickness retina at the macula adjacent to these lesions. Laser photocoagulation alone was successful in achieving long-term macular reattachment in one eye but failed in both eyes of a bilaterally affected patient. In this patient, retinal cryopexy, external drainage of subretinal and retinoschisis cavity fluid, and intravitreal air injection attained long-term macular reattachment and retinoschisis cavity collapse in both eyes. In the third patient, cryopexy, drainage of subretinal and retinoschisis cavity fluid, and scleral buckling failed to reattach the retina. Subsequent laser photocoagulation induced reabsorption of subretinal fluid but without retinoschisis cavity collapse. Alternative management strategies for these unusual cases include retinal cryopexy alone and vitrectomy techniques.     

Short-term blood-aqueous barrier breakdown after implantation of the 1CU accommodative posterior chamber intraocular lens

PURPOSE: To quantify intraocular inflammation after phacoemulsification with implantation of an accommodative posterior chamber intraocular lens (IOL). SETTING: Department of Ophthalmology, University of Erlangen-Nürnberg, Erlangen, Germany. METHODS: Twenty cataractous eyes of 20 patients without preexisting blood-aqueous barrier (BAB) deficiencies or previous intraocular surgery were included in this study. The mean age of the patients was 64.6 years +/- 16.0 (SD). A single surgeon performed phacoemulsification through a superior sclerocorneal tunnel incision and implantation of a 1CU IOL (HumanOptics AG) though a 3.2 mm incision. The haptics of the single-piece acrylic 1CU lens are designed for anterior optic movement following ciliary muscle contraction. The postoperative treatment was standardized. Postoperative BAB breakdown was quantified by laser flare photometry (FC-1000, Kowa) at 1 day, 1 and 4 weeks, and 3 and 6 months. RESULTS: The mean aqueous flare was 6.3 photons/ms +/- 3.0 (SD) (range 4.0 to 12.2 photons/ms) 1 day postoperatively, with 64% of patients having normal aqueous flare values (<8.0 photons/ms). One week after surgery, the mean aqueous flare was 5.3 +/- 2.8 photons/ms (range 2.0 to 10.5 photons/ms). Four weeks postoperatively, aqueous flare was normal in all patients and remained stable below the normal limit for up to 6 months (mean 3.3 +/- 1.2 months; range 2.0 to 5.4 months). The number of aqueous cells did not increase at any follow-up and was normal in all eyes. No postoperative complications such as fibrin formation, synechias, macrophages on the IOL optic, or endophthalmitis were observed. CONCLUSIONS: Phacoemulsification with implantation of the 1CU accommodative IOL led to minimal and short-lasting BAB alteration. No signs of persistent inflammation or pigment dispersion were detected.     

Vitreous changes after treatment of retinopathy of prematurity

PURPOSE: To investigate the vitreous findings in patients with cicatricial retinopathy of prematurity (ROP) who underwent retinal cryopexy and/or photocoagulation during the acute phase of the disease. METHODS: Vitreous findings were evaluated in 15 patients (29 eyes) with cicatricial ROP by slit-lamp biomicroscopy and indirect ophthalmoscopy. RESULTS: The ocular examination revealed that all eyes had extensive vitreous liquefaction that affected a large segment of the vitreous. A great deal of fibrillar condensation of the vitreous was present in membrane-like vitreous fibers that traversed the vitreous cavity to the periphery of the degenerating retina. These vitreous changes were most marked in the areas in which retinal cryopexy and/or photocoagulation had been performed. Despite advanced liquefaction, the posterior cortical vitreous was not separated from the retina in any eyes. CONCLUSION: In eyes with ROP that underwent retinal cryopexy and/or photocoagulation during the acute phase of the disease, the vitreous was abnormal, which may contribute to vitreoretinal traction that eventually leads to retinal breaks and detachment.     

后Tenon囊下注射曲安奈德对激光光凝后糖尿病大鼠视网膜炎症相关细胞因子表达的影响

目的 观察后Tenon囊下注射曲安奈德（TA）对激光光凝后糖尿病大鼠视网膜炎症相关细胞因子表达的影响。方法 雄性Brown Norway健康大鼠48只,通过腹腔注射链脲佐菌素建立糖尿病大鼠模型。将大鼠随机分成实验组、对照组和空白组,分别为20、20、8只大鼠。实验组、对照组大鼠行激光光凝后,给予后Tenon囊下注射TA或生理盐水50 μl。空白组不作任何处理。激光光凝后1、3、7 d,采用荧光定量聚合酶链反应和酶联免疫吸附试验检测大鼠视网膜中血管内皮生长因子（VEGF）、白细胞介素-6（IL-6）和肿瘤坏死因子-α（TNF-α）的mRNA和蛋白表达。结果 激光光凝后1、3、7 d,实验组和对照组分别与空白组比较,其VEGF、IL-6、TNF-α mRNA和蛋白表达均明显升高,差异均有统计学意义（P＜0.05）。实验组VEGF、IL-6、TNF-α mRNA和蛋白表达均较对照组明显下降。实验组与对照组比较,激光光凝后1 d,VEGF mRNA表达间差异无统计学意义（P＞0.05）;其余各时间点VEGF、IL-6、TNF-α mRNA和蛋白表达间差异均有统计学意义（P＜0.05）。结论 后Tenon囊下注射TA可有效降低激光光凝导致的糖尿病大鼠VEGF、IL-6、TNF-α表达水平的升高。     

Quantification of blood-aqueous barrier breakdown after phacoemulsification in Fuchs' heterochromic uveitis

PURPOSE: To quantify the breakdown of the blood-aqueous barrier (BAB) following phacoemulsification with posterior chamber lens implantation in eyes with Fuchs' heterochromic uveitis (FHU). PATIENTS AND METHODS: In this retrospective study, 19 eyes of 19 patients with FHU (mean age 38 +/- 14 years) and 35 eyes of 35 patients with senile cataracts (mean age 63 +/- 9 years) underwent phacoemulsification with one-piece PMMA posterior chamber lens implantation. Aqueous flare was quantified using the laser flare-cell meter (LFCM, Kowa FC-1000) following medical pupillary dilation preoperatively and 1, 3, and 5 days, then 1 and 6 weeks and 6 months postoperatively. RESULTS: Mean preoperative aqueous flare (in photon counts per millisecond) in FHU vs. controls was 11.7 +/- 3.5 vs. 5.8 +/- 1.7. Following cataract surgery, mean aqueous flare increased to 27.8 +/- 4.4 vs. 16.0 +/- 4.5 on day 1, decreased to 23.6 +/- 4.0 vs. 11.8 +/- 3.5 on day 3, and to 18.0 +/- 3.0 vs. 9.5 +/- 1.7 on day 5. In FHU eyes, it was 13.9 +/- 2.7 after 1 week, and had returned to preoperative levels after 6 weeks (10.9 +/- 2.5) and remained stable for up to 6 months (mean 10.3 +/- 2.2). Pre- and postoperatively, aqueous flare values were 2-3 times higher in FHU eyes than in control eyes with senile cataract (p = 0.01). No postoperative complications such as fibrin formation, synechiae, macrophages on the intraocular lens optic or endophthalmitis were observed in any of the patients. CONCLUSIONS: BAB breakdown following phacoemulsification with posterior chamber lens implantation is relatively mild in eyes with FHU and the BAB appears to be fully reestablished to preoperative levels 6 weeks postoperatively, explaining the usually good outcome of cataract surgery in this condition.     

光凝和冷凝治疗孔源性视网膜脱离的临床研究

目的：分析二极管激光光凝和冷凝在巩膜扣带术中治疗视网膜脱离的临床应用。方法：回顾分析1998年1月－1998年12月我科在巩膜扣带术中利用二级管激光封闭视网膜裂孔的光凝组30眼与冷凝封闭裂孔的冷凝组37眼的孔源性视网膜脱离患者的临床效果。结果：光凝组一次复位率100％。冷凝组一次复位率97．3％。术后视力改善光凝组25眼（83．83％）,凝凝组26眼（70．27％）。冷凝组术后出现5例黄斑部视网膜前膜。结论：二极管激光在巩膜扣带术中,治疗孔源性视网膜脱离和冷冻一样简单、有效。     

多波长氪激光配合中药在局限性孔源性视网膜脱离的应用

目的:观察多波长氪激光配合中药治疗局限性孔源性视网膜脱离。方法:回顾性分析85例108眼局限性孔源性视网膜脱离,经过多波长氪激光及中药治疗,并随访0.5a。结果:本组108眼中,治愈101眼(93.5%),无效7眼(6.5%)。治愈眼均为光凝1次后,视网膜脱离范围局限,视网膜下积液逐渐吸收后再予补充1～2次光凝,病情稳定后常规0.5a复查,均未复发。无效眼均采用冷凝联合巩膜外垫压手术治愈,术后在视网膜变性区周围补充光凝,108患眼均配合中药治疗。结论:波长氪激光配合中药治疗局限性孔源性视网膜脱离,疗效可靠。     

Retinal cryopexy in the management of proliferative diabetic retinopathy

Peripheral retinal cryopexy resulted in stabilization of progressive retinopathy and vitreous hemorrhage in 13 eyes of 13 diabetics. In most cases, cryopexy followed complete or nearly complete pan-retinal photocoagulation which did not prevent subsequent vitreous hemorrhage. No eyes in our series hemorrhaged following cryopexy during the period of postoperative observation. Existing vitreous opacities generally cleared sufficiently to permit further photocoagulation. Visual acuity did not decrease on the basis of hemorrhage after cryotherapy, but rather improved in most cases. Peripheral retinal cryopexy is recommended as an alternative to vitrectomy for the initial treatment of recurrent and persistent diabetic vitreous hemorrhage.     

Anterior chamber inflammation following cataract surgery in patients with non-insulin-dependent diabetes mellitus

PURPOSE: The aim of the study was to estimate the early breakdown of the blood-aqueous barrier (BAB) following uneventful cataract surgery in patients with non-insulin dependent diabetes mellitus. MATERIAL AND METHODS: Aqueous flare was estimated in 54 diabetic eyes before and after cataract surgery. Fifteen eyes underwent uneventful ECCE (extracapsular cataract extraction with "can opener" capsulotomy) and 39 phacoemulsification with continuous curvilinear capsulorhexis. All procedures were performed by experienced surgeons. Fifty six eyes of age-matched healthy patients undergoing uncomplicated cataract surgery served, as control. Anterior chamber flare was quantified preoperatively, 1 and 3 days postoperatively, using laser-flare meter (Kowa FM-500). Laser flare values were expressed in photon counts/millisecond. RESULTS: Mean preoperative anterior chamber flare in diabetes type 2 was as follows: normal fundus--6.7, background retinopathy--8.6 and proliferative retinopathy--14.1 (p < 0.01 vs NF group). Significantly lower anterior chamber flare measurements following phacoemulsification (25.0-1 day, 17.8-3 days post surgery), than after ECCE (63.7 and 45.6, respectively) (p < 0.01) were observed in diabetic eyes. In phaco group, we noted lower flare values in eyes without retinopathy; 25.2-1 day, 14.0-3 days post surgery, than in proliferative retinopathy (31.5 and 28.4, respectively) (p < 0.05 vs no retinopathy group). CONCLUSIONS: Phacoemulsification, as a less traumatising technique produces less BAB breakdown and seems to be more suitable than ECCE in diabetic eyes. Following phacoemulsification, eyes with proliferative retinopathy had significantly higher flare values than eyes without retinopathy.     

Nicardipine inhibits acute rise of aqueous flare and intraocular pressure induced by argon laser photocoagulation

The purpose of this study was to examine the anti-inflammatory effect of the calcium channel blocker nicardipine. Intraocular inflammation was induced by argon laser photocoagulation of the iris of pigmented rabbits and was assessed by measuring aqueous flare and intraocular pressure. This resulted in a marked increase in the aqueous flare that peaked at approximately one hour following coagulation and returning to the original values after six hours. Intraocular pressure increased within 15 minutes following laser treatment and returned to baseline levels at 60 minutes. Pre-treatment of the rabbits with an intravenous injection of 2 mg/kg of nicardipine completely abolished both the increase in aqueous flare and intraocular pressure induced by laser photocoagulation as compared to the control experiment. Earlier work from the author's group has shown that nicardipine can also block aqueous flare and intraocular pressure increases induced by topical administration of prostaglandin E2. From these combined experiments they would like to draw the conclusion that the inflammatory reaction induced by photocoagulation of the iris is partly mediated by prostaglandins and that blockade of calcium channels by nicardipine can inhibit the effects induced by prostaglandin E2.     

Inflammation after implantation of hydrophilic acrylic,hydrophobic acrylic,or silicone intraocular lenses in eyes with cataract and uveitis: comparison to a control group

PURPOSE: To compare the course of inflammation after small-incision cataract surgery with implantation of 1 of 3 types of foldable intraocular lenses (IOLs) in eyes with uveitis. SETTING: Department of Ophthalmology, University of Vienna, Vienna, Austria. METHODS: Seventy-four eyes with uveitis and cataract and 68 control eyes with cataract were prospectively selected to receive a foldable hydrophilic acrylic (Hydroview, Bausch & Lomb), hydrophobic acrylic (AcrySof, Alcon), or silicone (CeeOn 911, Pharmacia) IOL. All surgery was performed by the same surgeon using a standardized protocol: clear corneal incision, capsulorhexis, phacoemulsification, and in-the-bag IOL implantation. Preoperative and postoperative inflammation was evaluated by measuring aqueous flare preoperatively and 1, 3, 7, 28, 90, and 180 days after surgery using the Kowa FC-1000 laser flare-cell meter. All uveitic eyes were in remission for at least 3 months before surgery. RESULTS: In the uveitic eyes, there was no statistically significant difference in the postoperative course of flare and cell among the 3 IOL groups. Six months after surgery in uveitic eyes, flare values reached preoperative levels and the cell count was lower than preoperatively in all 3 IOL groups. Relative flare values were higher in the eyes with uveitis and a CeeOn 911 IOL; however, the difference between this group and the 2 acrylic IOL groups was not significant. CONCLUSIONS: There were no significant differences in inflammation after implantation of foldable IOLs in uveitic eyes. Although absolute flare values and cell counts in eyes with uveitis were higher than in control eyes, primarily because of a damaged blood-aqueous barrier (BAB), BAB recovery was similar between the 2 groups. The changes in the BAB indicate that foldable IOL implantation is safe in uveitic eyes.     

Comparative laser flare measurement and fluorophotometry in anterior and posterior uveitis

Summary Recent studies have sought to quantify aqueous flare by laser flare measurement. An increase in aqueous flare caused by a rise of protein concentration was frequently found both in anterior and posterior segment disease. This has been interpreted as a breakdown of the blood – aqueous barrier (BAB). By measuring the diffusion coefficient of the BAB compared to the aqueous flare value in patients with anterior and posterior uveitis, the extent to which the increase in flare value was related to a possible break down of the BAB was examined. Patients: Thirty-nine normal eyes (23–78 years; 41.6 ± 18.6), 18 eyes with anterior uveitis (iritis, iridocyclitis; 18–57 years; 35.2 ± 12.4) and 29 eyes with posterior uveitis (chorioretinitis or retinochorioiditis; 18–51 years; 31.7 ± 10.5). The diffusion coefficient P(a) of the BAB was measured fluorophotometrically, while the flare value was quantified by laser flare measurement. Results: Flare values (1/ms) were found to be significantly increased (p < 0.001) compared to normal eyes (4.6 ± 1.7) both in anterior uveitis (20.9 ± 8.5) and in posterior uveitis (17.4 ± 8.3) but did not significantly differ between them (p = 0.43). The diffusion coefficient P(a) (10^–3/min) of the BAB was not significantly different (p > 0.05) between normal eyes (0.5 ± 0.2) and eyes with posterior uveitis (0.9 ± 0.7), whereas it was significantly increased (p < 0.001) in anterior uveitis (6.5 ± 5.4) compared to the other groups. Conclusions: (1) In posterior uveitis, an increased flare value is not necessarily correlated with a breakdown of the BAB; proteins may enter the aqueous from posterior. (2) Assessing the function of the BAB in posterior segment disease using laser measurement should be carried out with caution; if possible, permeability measurements of the BAB should be undertaken seperately.      

CD105评价脉络膜新生血管变化的实验研究

目的:通过免疫组织化学法观察CD105对实验性脉络膜新生血管(choroidal neovascularization,CNV)变化评价的准确性.方法:采用氪激光诱导棕色挪威(brown Norway,BN)大鼠建立实验性CNV模型.24只雄性BN大鼠,随机分为正常对照组(6只)与模型组(18只).模型组行659nm氪激光视网膜光凝,功率360mW,曝光时间0.05s,光斑直径50μm.光凝后7、14、21d行荧光素钠和吲哚菁绿眼底血管造影,观察CNV形成率及渗漏光斑平均光密度值(average optical density,AOD)变化.处死大鼠,获得眼球标本,观察CNV的组织病理学变化和CD105因子的表达.结果:光凝后7d,CNV开始形成,14d和21d达到高峰.光凝后7、14、21d的CNV形成率分别为77.08%、85.42%、89.58%.光凝后7~21d,荧光素渗漏AOD值逐渐增高(P<0.05),7d与14d比较差异有统计学意义(P<0.05),14d与21d比较差异无统计学意义(P>0.05).造模后7~21d,CD105因子表达先升高后下降,7d与14d比较AOD值差异有统计学变化(P<0.05),14d与21d比较AOD值差异无统计学变化(P>0.05).结论:CD105免疫组织化学与眼底血管造影对CNV变化规律的研究结果具有高度一致性,CD105免疫组织化学评价CNV具有准确、易操作的优点.