简介:AIM:Todeterminetheproliferativepotentialandthemaintenanceofstemcellactivityinstoredhumanlimbaltissues,andcorrelatethiswiththepreservationtime,cellviabilityandtheexpressionofstemcellmarkers.METHODS:Thirtylimbalrimsweresplitinto4partsandstoredincornealpreservationmediumat4℃for0,1,4,or7days.ThelimbalstemcellandmitoticmarkersP63,CK19,proliferatingcellnuclearantigen(PCNA),andKi67weredeterminedbyimmunohistochemicalstaining.Theproliferativepotentialoflimbalepithelialcellswasassessedbycellviability,theabilityofgeneratingstratifiedepithelium,andcolonyformingassay.RESULTS:Thestoredtissuesmaintainedlimbalstratifiedstructureto7daysandexhibitedcomparableexpressionlevelofstemcellandmitoticmarkers.Theproportionofviablecellsdecreasedwiththeprolongedpreservationtime,whilecolonyformingefficiencydecreasedfromthe1stdayanddisappearedatthe4thday.Wheninoculatedonamnioticmembrane,thecellspreservedfor1dayformedastratifiedepithelium,whilethecellsfrom4days’preservationformedadiscontinuouslayer.CONCLUSION:Thecolonyformingefficiencyoflimbalepithelialstem/progenitorcellsdecreasedrapidlywiththeincreasingpreservationtime,whiletheexpressionlevelofmarkersandcapacityofformingepithelialmonolayeronamnioticmembranedecreasedgradually.Thelimbalepithelialstemcellslosttheirfunctionearlierthanthelostexpressionlevelofstemcellmarkers.Thismayhelpustobetterchoosetheappropriatepreservationgraftsforfuturelimbalstemcelltransplantation.
简介:目的研究高眼压及其持续时间对大鼠视网膜caspase-3表达的影响。方法通过前房灌注平衡盐液建立大鼠急性高眼压模型:高眼压持续时间均为4h,依据眼内压的不同将sD大鼠60只随机分为正常对照组、40mmHg(1mmHg=0.133kPa)组、60mmHg组、80mmHg组、100mmHg组,每组12只。将眼内压为80mmHg的48只sD大鼠随机分为正常对照组、2h组、4h组、8h组,每组12只。正常对照组不给予前房灌注,其他各组分别给予不同的高眼压或高眼压持续不同时间。各组灌注结束后快速摘除眼球,分别采用Western印迹法和免疫组织化学法检测视网膜caspase-3的表达。结果与对照组相比,40mmHg组大鼠视网膜caspase-3的表达无增加(P〉0.05);60mmHg组、80mmHg组和100mmHg组大鼠视网膜caspase-3的表达均强于正常对照组(q值分别为4.87、5.28和6.71;P〈0.01),但各组之间差异无统计学意义(P〉0.05)。与对照组相比,2h组大鼠视网膜caspase-3的表达差异无统计学意义(P〉0.05),4h组和8h组大鼠视网膜caspase-3的表达均增加(q值分别为2.81和3.67;P〈0.01)。表达caspase-3的视网膜细胞主要位于神经节细胞层、外丛状层和内丛状层。结论采用前房灌注平衡盐液制作急性高眼压模型研究高眼压大鼠视网膜caspase-3的表达时,眼内压为80mmHg、高眼压持续4h即可。
简介:目的通过安徽省某县09年度与11年度分别开展的贫困白内障复明手术各300例(300眼),手术结果的比较,探讨防盲手术培训的重要性。方法手术均由通过培训与再培训并获得资格认证的两位医生完成。术前视力〈0.1,排除其他眼病及严重全身疾病。手术方式统一为小切口非超声乳化白内障摘除及人工晶状体植入术,植入的人工晶状体均为Alton晶状体,粘弹剂为玻璃酸钠(其胜,上海产)。术前、术后处理按照安徽省防盲手术要求执行。结果比较两年度病人的早期术后视力,术中及术后早期并发症,09年度与11年度比较,术后第一天裸眼视力≥0.3比率由49.5%上升至60.4%;术中玻璃体脱出由7%降至4%;角膜水肿发生率由16%降至11%;其他并发症同样明显减少。而每例白内障手术时间也由40分钟减少至22分钟。结论11年度手术质量明显好于09年。并且09年手术是在省防盲中心派一名教师现场指导下完成,而11年度则是完全是独立完成。这些结果均提示通过有效的防盲手术培训,能以明显的提高白内障手术质量;同时也充分证实了防盲手术培训是非常重要的。
简介:目的对眼科住院医师实施白内障囊外摘除术及人工晶体植入术中,手术并发症的预防及处理能力培训探讨。方法开展防盲治盲工作中,住院医师共施行215例(235只眼)的白内障囊外摘除术及人工晶体植入手术,对发生并发症进行回顾性分析。结果术后发生的手术并发症:后囊破裂15只眼(6.4%),虹膜脱出5只眼(2.1%),虹膜根部离断3只眼(1.3%),角膜水肿45只眼(19.1%),瞳孔上移10只眼(4.3%),前房皮质残留2只眼(0.9%),后囊瞳孔区皮质残留2只眼(0.9%),继发性瞳孔阻滞性青光眼1只眼(0.4%),黄斑囊样水肿1只眼(0.4%)。结论后囊膜破裂和角膜水肿是本组白内障囊外摘除术及人工晶体植入手术主要并发症,住院医师手术者应规范掌握手术要点是预防并发症发生的关键,对出现的手术并发症应积极妥善处理是减少并发症有效措施。
简介:AIM:Tocharacterizetemporalpatternofresolutionandrecurrenceofnaivechoroidalneovascularization(CNV)secondarytowetage-relatedmaculardegeneration(AMD)treatedwithintravitrealbevacizumabonasneededregimen,andtoanalyzebaselineriskfactorsforCNVresolutionorrecurrence.METHODS:Ninety-oneeyesof80patientswithnewlydiagnosedwetAMDwereretrospectivelystudied.Alleyesweretreatedwitharoundofthreemonthlyintravitrealbevacizumabinjections,followedbyoneadditional’bonus’injectionafterresolutionofCNVactivity.Duringfollow-up,eyesweremonitoredwithfluoresceinangiography,opticalcoherencetomography,andbest-correctedvisualacuity(BCVA).IncaseofrecurrencesofCNVactivity,eyeswereretreatedwithotherroundsofbevacizumabinjectionsfollowingthesametreatmentprotocol.RESULTS:Overamedianfollow-upof532d,themedianresolutiontimeofCNVactivityinthefirst,second,andthirdtreatmentroundwas98d,126d,and111d,respectively.Themedianrecurrencetimeforthethreeroundswas154d,126d,and151d,respectively.Nosignificantdifferenceinresolutiontime(P=0.09)orinrecurrencetime(P=0.11)wasdetectedamongtreatmentrounds.Age(P=0.0082)andlensstatus(P=0.035)werefoundtobeassociatedwithCNVresolution;forevery1-yearincreaseinagetherewas4%greaterchanceofCNVresolution;Phakiceyesdemonstrateda33%betterchancetoexperienceCNVresolutionthanpseudophakiceyes.ForCNVrecurrence,lensstatus(P=0.0009)andgender(P=0.0446)werefoundtobepredictive;pseudophakiceyeshada3.69-foldgreaterrisktoexperiencerecurrenceofCNVactivitycomparedtophakiceyes;maleshada2.19-foldgreaterrisktoexperiencerecurrenceofCNVactivitythanfemales.NosignificantBCVAchangesamongthreetreatmentroundswerenoted(P=0.56).CONCLUSION:ResolutiontimeandrecurrencetimeofCNVactivitywerenotsignificantlydifferentamongtreatmentrounds,suggestingabsenceoftachyphylaxistobevacizumab.Acautiousdecisionshouldbemadeupondisco