翼状胬肉切除联合自体角膜缘干细胞移植术疗效分析

目的:探讨翼状胬肉切除联合自体角膜缘干细胞移植术治疗翼状胬肉的临床疗效。方法:对47例52眼翼状胬肉实施翼状胬肉切除联合自体角膜缘干细胞移植术,观察术后角膜上皮修复及翼状胬肉复发情况。结果:随访观察3mo以上,1眼复发(2%),角膜上皮恢复时间为2～3d。结论:翼状胬肉切除联合自体角膜缘干细胞移植术治疗翼状胬肉疗效可靠。     

复发性翼状胬肉不同手术方法的疗效的临床分析

目的探讨不同手术方式治疗复发性翼状胬肉的疗效。方法选取复发性翼状胬肉患者60例(60只眼)随机分成两组:A组30个病人(30只眼)翼状胬肉切除联合冻干羊膜移植术;B组30个病人(30只眼)翼状胬肉切除联合带自体角膜缘干细胞结膜瓣移植术。结果两组病人术后随访6个月至2年,翼状胬肉切除联合冻干羊膜移植术组与翼状胬肉切除联合带自体角膜缘干细胞结膜瓣移植术组术后复发率分别为:36.7%和10%,差异具有统计学意义(P<0.05).结论复发性翼状胬肉的治疗中翼状胬肉切除联合带自体角膜缘干细胞结膜瓣移植术相对于翼状胬肉切除联合冻干羊膜移植术疗效更明确。     

翼状胬肉切除联合自体角膜缘干细胞移植手术的临床观察

目的观察翼状胬肉切除联合自体角膜缘干细胞移植的临床效果。方法采用翼状胬肉切除联合自体角膜缘干细胞移植术的方法治疗翼状胬肉114例（141只眼）,术后随访6个月。结果 114例（141只眼）无术中及术后严重并发症,随访6个月,无复发病例。结论翼状胬肉切除联合自体角膜缘干细胞移植手术临床疗效满意,显著降低了术后复发率。     

角膜缘干细胞移植治疗翼状胬肉疗效观察

目的观察自体角膜缘干细胞移植治疗翼状胬肉的效果。方法对52例(75只眼)翼状胬肉患者行显微镜下翼状胬肉切除并做角膜缘干细胞移植,术后随访观察12￣24个月。结果术后复发2只眼,复发率2.67%。结论翼状胬肉切除联合自体角膜缘干细胞移植治疗翼状胬肉的效果是肯定的,是一种理想的手术方法。     

自体角膜缘干细胞移植治疗维吾尔族翼状胬肉的疗效

目的: 观察翼状胬肉切除联合自体角膜缘干细胞移植治疗维吾尔族翼状胬肉患者的效果。方法: 维吾尔族患者翼状胬肉163例180眼,采用手术显微镜下翼状胬肉切除联合角膜缘干细胞的结膜瓣移植术,术后观察视力及翼状胬肉复发情况。结果: 翼状胬肉患者163例180眼成功进行翼状胬肉切除联合自体角膜缘干细胞移植术,随访6～48mo,术后12mo内无复发病例;18mo复发1眼(0.6%);24mo复发6眼(3.3%);48mo复发9眼(5%)。163例180眼中16眼复发,复发胬肉较薄,充血轻。本组复发率为8.9%,余未发现复发及复发倾向。结论: 翼状胬肉切除联合自体角膜缘干细胞移植术治疗翼状胬肉并发症少、复发率低,是新疆维吾尔族翼状胬肉患者较为适当的手术方式。     

翼状胬肉不同术式预防复发的对比研究

目的采用翼状胬肉切除联合丝裂霉素及羊膜移植术和翼状胬肉切除联合丝裂霉素及自体角膜缘干细胞移植术,与以往传统的胬肉切除及暴露角膜缘巩膜术方法进行对比研究。方法将翼状胬肉随机分为3组,每组50例,A组:胬肉切除及暴露角膜缘巩膜术组50例(50眼);B组:翼状胬肉切除联合丝裂霉素及羊膜移植术组50例(50眼);C组:翼状胬肉切除联合丝裂霉素及自体角膜缘干细胞移植术组50例(50眼)。术后随访3~22月,对3种不同术式预防复发进行研究。结果A组复发10眼(20.00%),B组复发3眼(6.00%),C组复发2眼(4.00%)。B组和C组与A组对比差异有统计学意义(P<0.01),B组与C组对比差异无统计学意义(P>0.05)。结论翼状胬肉切除联合丝裂霉素及羊膜移植术和翼状胬肉切除联合丝裂霉素及自体角膜缘干细胞移植术都能有效预防翼状胬肉复发。     

翼状胬肉切除联合带角膜缘上皮的自体结膜瓣移植术152例疗效观察

目的 探讨翼状胬肉切除联合带角膜缘上皮的自体结膜瓣移植术的疗效。方法 对152例(182只眼)翼状胬肉患者行翼状胬肉切除后联合带角膜缘上皮的自体结膜瓣移植术。术后随访观察6～12个月。结果 术后复发10只眼，复发率5．49％，其中3只眼为复发性翼状胬肉。结论翼状胬肉切除联合带角膜缘上皮的自体结膜瓣移植术方法简单、疗效可靠。     

翼状胬肉逆行切除联合自体结膜或角膜缘干细胞移植术的疗效观察

目的 观察翼状胬肉逆行切除联合自体结膜或角膜缘干细胞移植术防止翼状胬肉复发的疗效.方法 将73例(82只眼)翼状胬肉患者分为结膜组36例(41只眼)和干细胞组37例(41只眼),两组分别行翼状胬肉逆行切除联合自体结膜移植术和翼状胬肉逆行切除联合角膜缘干细胞移植术.观察术后两组角膜上皮修复时间和胬肉复发情况.结果 术后随访2年,两组患者均无睑球粘连和眼球活动受限等并发症.干细胞组角膜上皮平均修复时间为(5.7±1.3)d,胬肉复发率为4.9%(2/41),结膜组角膜上皮平均修复时间为(6.1±1.1)d,复发率为9.8%(4/41),两组比较差异均无统计学意义(P＞0.05).结论 翼状胬肉逆行切除联合自体结膜或角膜缘干细胞移植术均能有效降低胬肉的复发率.(中国眼耳鼻喉科杂志,2010,10:303-305)     

翼状胬肉切除联合自体干细胞移植的临床研究

目的观察翼状胬肉单纯切除与显微切除联合自体角膜缘干细胞移植治疗翼状胬肉的临床疗效。方法随机选择翼状胬肉52例(56眼)，分为A、B两组，每组各26例(28眼)，分别行胬肉单纯切除术及显微自体角膜缘干细胞移植术，观察术后并发症、恢复时间及复发率。结果随访3～20月，B组术后恢复时间较A组长；A组8眼复发(28．6％)，B组1眼复发(3．57％)，两组复发率有显著性差异。结论显微自体角膜缘干细胞移植治疗翼状胬肉手术简便安全，成功率高，是处理翼状胬肉的最佳手术方式。     

逆向切除联合角膜缘干细胞移植治疗翼状胬肉的疗效分析

目的探讨胬肉逆向切除联合自体角膜缘干细胞移植治疗翼状胬肉的疗效。方法对2007年5月-2008年12月我院收治的78例（92只眼）翼状胬肉患者行胬肉逆向切除联合自体角膜缘干细胞移植术,术后随访6月-2年。结果除3眼复发外,余均治愈,复发率为3.26%。结论翼状胬肉逆向切除可使病灶切除更彻底,可减少组织损伤,角膜缘干细胞移植重建角膜缘,角膜上皮修复快,可有效防止翼状胬肉复发。     

Homeostasis of the retinal micro-environment: I. Magnesium,potassium and calcium distributions in the avian eye

The concentrations of Mg²⁺, K⁺ and Ca²⁺ in the intraocular fluids (IOFs) and blood plasma of chickens and pigeons were determined by atomic absorption spectrophotometry. The Mg²⁺ concentration in the IOFs of both species was greatest in the liquid vitreous adjacent to the retina followed by aqueous > blood plasma > plasma dialysate. In contrast the concentration of K⁺ in the IOFs of both chickens and pigeons was greater in the aqueous than in the liquid vitreous. The concentrations of Ca²⁺ in all IOF compartments of chicken eyes were virtually identical and were lower than that of blood plasma. The concentrations of Mg²⁺ in the IOFs of the chicken, especially in the liquid vitreous, was remarkably stable; experimentally lowering or raising the plasma Mg²⁺ concentration over a relatively wide range had little or no effect on the Mg²⁺ concentration in the IOFs of these animals. We can conclude that a high Mg²⁺ and low K⁺ concentration in the extracellular fluids of the retina is maintained in the avian eye, as in the mammalian eye, by active transport processes across the blood-retinal barrier systems. Because the avian retina is completely avascular, the site of these homeostatic transport processes must be the epithelium of the retinal choroid and/or the pecten. These findings support the concept that the contribution of the vitreous to the homeostasis of the retinal micro-environment is inversely related in vertebrates to the degree of retinal vascularization.     

Vergleich der Durchmesserreaktion retinaler Arterien und Venen auf Flickerlicht

ZusammenfassungZiel In dieser Studie soll die durch Flickerlicht verursachte Durchmesserreaktion retinaler Arterien und Venen hinsichtlich Ausmaß und zeitlichem Ablauf verglichen werden.Methoden In die klinische Studie wurden 26 gesunde Probanden einbezogen. Der Durchmesser der retinalen Gefäße jeweils eines Auges wurde kontinuierlich mittels eines Retinal vessel analyzer gemessen. Jede Untersuchung bestand aus 100 s Baseline sowie 5 Perioden von 20 s Flickerlichtstimulation, gefolgt von 80 s Beobachtung.Ergebnisse Unmittelbar nach Flickerlicht dilatierten die Arterien um 6,9±2,8% (MW±STD) und die Venen um 6,5±2,8% (Unterschied nicht signifikant). Der Quotient aus arterieller und venöser Dilatation (AVDQ) betrug 1,25±0,69 (Spannweite 0,2 bis 2,8). Es konnte keine signifikante Altersabhängigkeit der arteriellen bzw. venösen Dilatation oder des AVDQ nachgewiesen werden. Die arterielle Dilatation ging nach 25,9±10,8 s in eine leichte Konstriktion von –2,7±1,4% über. Im Gegensatz dazu waren die Venen zum Zeitpunkt des individuellen Konstriktionsmaximums noch um 0,5±1,3% dilatiert (p<0,001).Schlussfolgerungen Die flickerlichtinduzierte Durchmesserreaktion retinaler Arterien und Venen unterscheidet sich bei Gesunden nicht in ihrem mittleren dilatativen Maximum, aber in Form und zeitlichem Verlauf des Abklingens der Dilatation.Unterstützung durch: BMBF 13N7999.Vortrag gehalten auf der 101. Jahrestagung der DOG, Berlin, September 2003.     

Acute Multifocal Placoid Pigment Epitheliopathy Associated with Cavernous Sinus Thrombosis

Acute multifocal placoid pigment epitheliopathy (AMPPE) has been associated with disease of the central nervous system. In this case report, we discuss a patient presenting with AMPPE in the setting of a new central nervous system association: cavernous sinus thrombosis.     

Dual nonlinearities regulate contrast sensitivity in pattern discrimination tasks

Many current psychophysical models propose that visual processing in cortex is hierarchical, with nonlinearities sandwiched between linear stages of processing. In earlier publications, we proposed a model of this type to account for masking effects found with spatial frequency and orientation discriminations. Our model includes two nonlinear mechanisms that regulate contrast sensitivity in early cortical mechanisms. The first is a local within-pathway nonlinearity that accelerates at low contrasts but is compressive at high. The second is a pooled nonlinear gain control process that operates over a broad range of neurons with different tuning characteristics. Here, we test predictions of the model for spatial frequency discriminations. The model predicts that at low contrasts, adding a grating mask oriented parallel to test gratings will improve discrimination performance via operation of the within-pathway nonlinearity, analogous to the "dipper effect" found with contrast discriminations. Adding an orthogonally oriented mask is predicted to have no effect at low contrasts, where pooled gain control processes contribute little to performance. At high contrasts, the model predicts that performance will asymptote and become independent of contrast with either parallel or orthogonal masks. The results confirm model predictions.