学科分类
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500 个结果
  • 简介:使用连续调幅声信号记录听神经动作电位方法,测定了豚鼠耳蜗水平调谐曲线。调幅声频率特性优于滤波短声及短纯音。调幅声作测试声测定CAP调谐曲线,均呈锲形,有锐利尖顶。相隔3天测CAP调谐曲线形状基本相同,曲线Q10dB值、CF阀值和CF两边曲线斜率在两次测试之间十分接近。作者认为:用调幅声作为刺激信号,可记录耳蜗水平听神经动作电位,由此测得耳蜗CAP调谐曲线,可为临床听力学进行听觉辨别功能评价提供新手段。

  • 标签: 调幅声 耳蜗调谐曲线 复合动作电位
  • 简介:AIM:Todeterminetheclinicalfeatures,diagnosisandtreatmentoftheprimarySjogrensyndrome(SS)relatedopticneuritis.METHODS:Theclinicaldataof8patients(12eyes)withprimarySSrelatedopticneuritiswereanalyzedretrospectively.RESULTS:Eightof128consecutivepatientswithopticneuritisresultedfromvariedcausesfulfilledthediagnosticcriteriafortheprimarySS.Theypresentedinitiallywiththesignsandsymptomsofnon-specificopticneuritis,and5patientspresentingwithoutdrynessshowedachronicinflammationofsubmandibularglandorparotidgland,andlymphocyteinfiltrationwasdemonstratedbylabialglandbiopsyin2patients.Therewereserumpositivetitersforanti-SjogrensyndromeA(SSA)in7patientsandanti-SjogrensyndromeB(SSB)in8patients.Anti-aquaporin-4(AQP4)antibodywasnegativeinallthe8patients.Bothglucocorticoidsandimmunosuppressiveagentwereadministered,andvisualacuityelevatedin8eyes(66.7%),3patients(37.5%)recurredinthefollow-up.CONCLUSION:PrimarySSrelatedopticneuritisislesscommonandeasilymisdiagnosed.Theconventionaltherapiesforopticneuritiscouldnotcontroltherecurrence.

  • 标签: OPTIC NEURITIS PRIMARY Sjgren’s SYNDROME anti-aquaporin-4
  • 简介:Leber'scongenitalamaurosis(LCA)andrecentgenetherapyadvancementfortreatinginheritedretinopathieswereextensiveliteraturereviewedusingMEDLINE,PubMedandEMBASE.Adeno-associatedviralvectorswerethemostutilisedvectorsforoculargenetherapy.Conephotoreceptorcellsmightuseanalternatepathwaywhichwasnotreliantoftheretinalpigmentepithelium(RPE)derivedretinoidisomerohydrolase(RPE65)toaccessthe11-cisretinaldehydechromophore.Researcheffortsdedicatedontheprogressionofagene-basedtherapyforthetreatmentofLCA2.Suchgenetherapyapproacheswereextremelysuccessfulincanine,porcineandrodentLCA2models.TherecombinantAAV2.hRPE65v2adenoassociatedvectorcontainedtheRPE65cDNAandwasreplicationdeficient.ItsinvitroinjectionintargetcellsinducedRPE65proteinproduction.Thegenetherapytrialsthatweresofarconductedforinheritedretinopathieshavegeneratedpromisingresults.PhaseIclinicaltrialstocureLCAandchoroideremiademonstratedthatadeno-associatedviralvectorscontainingRPEgenesandphotoreceptorsrespectively,couldbesuccessfullyadministeredtoinheritedretinopathypatients.AphaseIIItrialispresentlyongoingandifsuccessful,itwillleadthewaytoadditionalgenetherapyattemptstocuremonogenic,inheritedretinopathies.

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  • 简介:Aim:ToverifywhetherpartialintraoperativeTenon'scapsuleresection(PTCR)withadjunctiveMitomycinCiseffectiveindevelopingthin,avascularblebsineyesundergoingAhmedglaucomavalveinsertionandtoassesstheefficacyandsafetyofthisprocedure.Methods:ThisstudywasconductedinfourLatinAmericacountries(Argentina,Brazil,ColombiaandPeru).AhmedglaucomavalveimplantinsertionwithPTCR(groupA)andwithoutPCTR(groupB)wasperformedinneovascular

  • 标签: 部分眼球筋膜切除术 丝裂霉素C 疗效 艾哈默德青光眼瓣膜置入
  • 简介:白内障是最常见致盲眼病之一。谷胱甘肽S转移酶(glutathioneS-transferases,GSTs)是典型多功能酶,主要催化各种化学剂与谷胱甘肽结合。近些年研究表明,GSTs有抗过氧化引起白内障作用。GSTs表达水平高低在白内障形成中有着重要作用。我们将近年来GSTs与年龄相关性白内障研究情况做一综述。

  • 标签: 谷胱甘肽S转移酶 谷胱甘肽 白内障
  • 简介:目的检测超高度近视眼屈光度数、黄斑中心凹视网膜神经上皮层厚度及图像视觉诱发电位(PVEP)各波反应振幅与潜伏期,并与正常人比较,评价其差异。方法选择残疾鉴定工作中超高度近视患者20例(40眼)和正常对照组20例(40眼),用综合验光法验光,光学相干断层扫描仪(opticalcoherencetomography,OCT)测量黄斑中心凹神经上皮层厚度,图像视觉诱发电位(PVEP)测量各波反应振幅与潜伏期,分析超高度近视眼屈光度数、中心凹部神经上皮层厚度及PVEP各波反应振幅与潜伏期关系。结果超高度近视眼平均眼屈光度数为(18.30±4.67)D,与对照组比较,差异有统计学意义;黄斑中心凹平均神经上皮层厚度为(158.54±6.82)μm,与对照组比较,差异有统计学意义;PVEP各波反应潜伏期N75波为(85.26±2.95)ms,P100波为(120.97±10.58)ms,N145波为(153.66±9.03)ms,P100波振幅(5.12±2.03)uv,同对照组相比,各波反应潜伏期明显延迟,振幅低平,差异有统计学意义。结论超高度近视眼与正常眼相比,眼屈光度数越大,黄斑区神经上皮层厚度明显变薄,图像视觉诱发电位(PVEP)各波反应振幅与潜伏期明显较正常眼差,提示视网膜神经上皮通路功能明显受损。

  • 标签: 超高度近视眼 光学相干断层成像 黄斑部视网膜厚度 视觉诱发电位
  • 简介:AIM:Toexploretheeffectofsaturatedhydrogensalineonbluelight-inducedretinaldamageinrats.·METHODS:Theretinaldamageofratswasinducedbybluelightexposurefor6hoursandexamined8hours,16hoursand24hoursaftertheexposure.OnehundredfemaleSprague-Dawleyratswererandomlydividedintofourgroups.Group1included30ratsreceivedlightexposurewithoutanyothertreatment.Group2included30ratsreceivedlightexposurewithintraperitonealinjectionofnormalsaline.Group3included30ratsreceivedlightexposurewithintraperitonealinjectionofsaturatedhydrogensaline.AndGroup4includedtheother10ratswhichdidnotreceiveanytreatment.Theamountofintraperitonealinjectionofsaturatedhydrogensalineandnormalsalinewascalculatedintheratioof1ml/100gofratweight.SpecimenswerecollectedandprocessedbyH-Estaining,ultrastructureobservation,biochemicalmeasurement.Morphologicalchangeswereobservedbylightmicroscopeandtransmissionelectronmicroscope(TEM)andtheretinalouternuclearlayer(ONL)thicknesswasmeasuredbyIPP6.0,whilethemalondialdehyde(MDA)wasmeasuredbycolorimetricdeterminationat532nm.·RESULTS:AlthoughthestructureofretinainGroup1andGroup2wasinjuredheavily,theinjuryinGroup3wasmild.ThedifferencesbetweenGroup1andGroup2werenotsignificant.ComparedwiththeratsinGroup1andGroup2,theonesinGroup3hadmoreclearlydemarcatedretinastructureandmoreorderedcellsbylightmicroscopeandTEMobservation.TheONLthicknesses(400times)offourgroupsateachtimepointexceptbetweenGroup1andGroup2weresignificantlydifferent(P<0.05).ThethicknessesoftheONLinGroup1atthreetimepointswere30.41±4.04μm,26.11±2.82μmand20.63±1.06μm,inGroup2were31.62±4.54μm,25.08±3.63μmand19.07±3.86μm,inGroup3were29.75±3.62μm,28.83±1.97μmand27.61±1.83μm.InGroup4themeanofthethicknesswas37.35±1.37μm.Astimewentby,thedamageg

  • 标签: RETINA hydrogen ANTIOXIDANTS PHOTOTOXICITY DOI.3980/j.issn.2222-3959.2012.02.07
  • 简介:AIM:Anaerobicbacteriacancauseocularinfections.WetestedtheOxyPlateTMAnaerobicSystem(OXY)toisolatepertinentanaerobicbacteriathatcancauseoculardisease.METHODS:OXY,whichdoesnotrequiredirectanaerobicconditions(i.e.bags,jars),wascomparedtoconventionalisolationofincubatingculturemediainanaerobicbags.Standardcoloniescountswereperformedonanaerobicocularbacterialisolatesunderaerobicandanaerobicconditions(anaerobicbags)usingagarmedia:1)OXY(aerobiconly),2)5%sheepblood(SB),3)Chocolate,and4)Schaedler.Thebacteriatestedwerede-identifiedocularisolatesculturedfromendophthalmitisanddacryocystitisthatinclude10Propionibacteriumacnesand3Actinomycesspecies.Thecolonycountsforeachbacteriaisolate,oneachculturingcondition,wererankedfromlargesttosmallest,andnon-parametricallycomparedtodeterminethebestculturingcondition.RESULTS:Allanaerobicconditionswerepositiveforalloftheanaerobicisolates.SBandSchaedler’sagarunderaerobicconditionsdidnotsupportthegrowthofanaerobicbacteria.SparsegrowthwasnotedonchocolateagarwithPropionibacteriumacnes.Asananaerobicsystem,SBinananaerobicbagisolatedhighercolonycountsthanOXY(P=0.0028)andchocolateagar(P=0.0028).CONCLUSION:AlthoughOXYdidnottesttobemoreefficientthanotheranaerobicsystems,itappearstobeareasonablealternativeforisolatinganaerobicbacteriafromocularsites.Theuseofanagarmediuminaspeciallydesignedplate,withouttherequirementofananaerobicbag,renderedOXYasanadvantageoverotheranaerobicsystems.

  • 标签: ANAEROBIC BACTERIA BACTERIAL isolation ENDOPHTHALMITIS DACRYOCYSTITIS
  • 简介:AIM:TodiscusstheimpactofLyciumBarbarumPolysaccharide(LBP)andDanshensupurifiedfromTraditionalChineseMedicine(TCM)onvascularendothelialgrowthfactor(VEGF)ofrabbitswithretinalneovascularization.METHODS:Fortyrabbitsweredividedintonormalcontrolgroup,modelcontrolgroup,LBPgroupandDanshensugroup.Animalsinthenormalcontrolgroupwerefedinthenormaloxygenenvironment.Animalsintheotherthreegroupswereputintotheenvironmentwith70%oxygenfor5daysinordertobuildthemodelofoxygen-inducedvascularproliferationretinopathy.AndthendifferentTCMextractwasinjectedintotheabdominalcavitiesoftheseannimals.After7days,theVEGFcontentofintheserumofrabbitwasmeasuredbydoubleantibodysandwichmethod.RESULTS:DataanalysisindicatedthatVEGFcontentwasasfollows:Danshensugroupwaslowerthanmodelcontrolgroup(12.92±3.84ng/Lvs19.32±4.15ng/L,P<0.05);LBPgroupandnormalcontrolgroupwerelowerthanmodelcontrolgroup(12.92±3.84ng/L,9.26±1.61ng/Lvs19.32±4.15ng/L,P<0.01);totalbloodviscosity,plasmaviscosity,cholesterolcontent,fibrinogencontentandtriacylglycerolcontentafterperitonealinjectionofLBPandDanshensuwereobviouslylowerthanbeforeinjection.CONCLUSION:TCMextract-LBPandDanshensucanprominentlyreducethecontentofVEGFintheprocessofvascularproliferativeretinopathyofrabbit;canpreventtheoccurrenceofretinalmicrovasculardiseasebyimprovingpartialoxygen-deficientenvironmentoraffectingallkindsofnewgrowthfactor.

  • 标签: LYCIUM Barbarum POLYSACCHARIDE Dan-shensu vascular ENDOTHELIAL
  • 简介:AIM:TopresenttheresultsofimplantationofIakymenkokeratoprosthesisinfivepatientswithvascularizedcornealleukomacausedbysevereocularinjury.·METHODS:Iakymenkokeratoprosthesiswasimplantedinto5eyesof5patients:4patientsweresufferedfromchemicalburnsand1patientfromexplosiveinjury.Thepreoperativevisualacuityrangedfromlightperceptiontohandmotion.Theimplantationsurgerywascomposedoftwo-stageprocedures.Thefollow-upperiodwasfrom9monthsto11years.Theoutcomemeasureswerevisualacuity,retention,andcomplicationsofthekeratoprosthesis.·RESULTS:Visionimprovementswereachievedinmostpatients.Allkeratoprosthesiswereretainedwithinthefollow-upperiod.Cornealmeltingoccurredinonepatientandfibrousclosureinanotherpatient,bothofwhichweresuccessfullytreated.Retinaldetachmentoccurredinonepatientaftersurgery.·CONCLUSION:Iakymenkokeratoprosthesisseemstobeapromisingalternativeforthepatientswithseverecornealinjury,butfurtherinvestigationisneededtoevaluatetheroleofIakymenkokeratoprosthesis.

  • 标签: Iakymenko KERATOPROSTHESIS VISUAL REHABILITATION COMPLICATIONS
  • 简介:AIM:Toinvestigatethefrequencyofidiopathicphacodonesis(IP)insenilecataractsubjectsandtheshort-termclinicaloutcomesfollowingcataractsurgery.METHODS:Thisinstitutionalcase-controlstudyincluded1301consecutivelow-incomecataractsubjectsfromJunetoNovember2009.Anteriorsegmentwerecarefullyevaluatedwithdilatedpupilunderslit-lamp.IPwerescreenedandgradedbyacriteriasetbytheauthors.Riskfactors,surgicaloutcomes,andoperativecomplicationswereanalyzed.RESULTS:Atotalof42subjects(3.2%)withIPwerediagnosedandclassifiedasgrade1(36subjects),grade2(5subjects)andgrade3(1subject).HarderlensesandintumescentcataractswereobservedintheIPgroupthanthecontrolgroup(P<0.05).Logisticsregressiontestalsoindicatedthemainriskfactorwasthehardnessofthelens.Theincidenceofzonulardialysisduringsurgerywas23.8%(10eyes),whichwassignificantlyhigherthanthecontrols(0.7%,P<0.001).Visualoutcomesofthetwogroupswerenotstatisticallyorclinicallysignificant.CONCLUSION:HardnucleusandintumescentcataractarerelatedtoIPinsenilecataractsubjectsinQinghai,China.Withmorecarebeingtaken,grade1andsomeofthegrade2IPsubjectsachievedsimilarsurgicaloutcomesascomparedtocontrols.

  • 标签: phacodonesis LENS NUCLEUS zonular DIALYSIS
  • 简介:<正>DirSir,IamdoctorGuo-YuanYang,fromtheDepartmentofOphthalmologyofWestChinaHospitalofSichuanUniversityinChengdu,SichuanProvince,China.Iwritetopresentacasereportofposteriorlentiglobuswithcataract.

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  • 简介:AIM:Toevaluatechangesintheanteriorchamberdepth(ACD),crystallinelensthickness(LT)anditsrefractivepowerafterlaserinsitukeratomileusis(LASIK).·METHODS:Inallcases,thepreoperativeandpostoperativecentralACDwhichweremeasuredwithPentacam,Orbscan,IOL-MasterandA-scanultrasonography,centralcornealtruenetpowerwhichwasmeasuredwiththePentacam,OrbscanandIOL-Master,axiallength(AL)whichwasmeasuredwithIOL-MasterandLTwhichwasmeasuredwiththeA-scanultrasonographywerecomparedusingthepairedsamplettest.OcularrefractiveerrorsandlensrefractivepoweratcornealplanewerecalculatedandtheircorrelationswerealsoevaluatedbeforeandafterLASIK.RESULTS:At1weekafterLASIK,LTandcrystallinelensrefractivepoweratcornealplane(Dlens)whichwereassociatedwiththeIOL-MasterandPentacamincreasedsignificantly(P≤0.005),ACDdecreasedsignificantly(P≤0.001),butnosignificantincreasewasobservedintheDlenswhichwasassociatedwiththeOrbscan(P=0.261).SignificantcorrelationsbetweenthechangesintheocularrefractiveerrorsandDlenswhichwereassociatedwiththePentacamwereobservedat1weekand6monthsafterLASIK(P=0.028;P=0.001).CONCLUSION:LTincreasedsignificantlyafterLASIK,andthismightpartiallyleadtoACDdecrease,Dlensincreaseandasmallquantityofmyopicregression.

  • 标签: ANTERIOR CHAMBER depth CRYSTALLINE LENS thickness
  • 简介:AIM:ToexploretheinhibitoryeffectofasustainedcyclosporinA(CsA)deliverymicrosphere(CsA-MS)onposteriorcapsularopacification(PCO)inrabbiteyesaftercataractextraction.·METHODS:TwentyNewZealandwhiterabbitsacceptedcataractextractionplusintraocularlensimplantationandtheirlefteyeswereintraoperativelyinjectedCsA-MSpreparedusingpolymerpolylactioglycolicacid(PLGA)asacarrierandtheirrighteyeswereinjectedwithemptyMS.Thechangesincornea,anteriorchamberreaction,intraocularpressure,PCOandCsAconcentrationinaqueoushumorwereexaminedpostoperativelyandalltheeyeswereenucleated3monthsaftersurgeryforhistopathologicalandmorphologicalexaminationwithlightmicroscopyandelectronmicroscopy.·RESULTS:Conjunctivalhyperemia,cornealedema,intraocularpressureandanteriorchamberresponseofexperimentalandcontroleyesweresimilar,whilePCOinCsAMSinjectedeyeswasgreatlyimprovedcomparedwiththatincontroleyes.PosteriorcapsulesinCsA-MSinjectedeyesweresmoothandlensepithelialcells(LEC)didnotproliferatesignificantly(P>0.05),whileLECinposteriorcapsuleofcontroleyeshaddifferentdegreesofproliferationandcorticalregeneration.LECinCsA-MSinjectedeyeswerenotfunctionallyactiveandunderwentapoptosis,whereasLECincontroleyeswerefunctionallyactive(F-test,P=0.025).Inaddition,thecornealultrastructureshowednodifferencesbetweenCsA-MSandMSinjectedeyes.CONCLUSION:CsA-MShashighbioavailabilityinrabbiteyesandcouldinhibitpostoperativePCOoccurrenceanddevelopmentduringthestudyperiod,suggestingthatCsA-MSmaybeapromising,effectiveandsafeadministrationroutetopreventPCOinclinic.

  • 标签: SUSTAINED CYCLOSPORINE A delivery mic-rosphere POSTERIOR
  • 简介:AIM:Toinvestigatetheefficacyofnon-buckledvitrectomywithclassicalendotamponadeagentsinthetreatmentofprimaryretinaldetachment(RD)complicatedbyinferiorbreaksandproliferativevitreoretinophathy(PVR).METHODS:Aretrospective,consecutiveandcaseseriesstudyof40patientswithinferiorbreakRDandPVR≥C1wasconducted.Allpatientsunderwentastandard3-port20-gaugeparsplanavitrectomy(PPV)withgasorsiliconeoiltamponadewithoutsupplementaryscleralbuckling.Thevitreousandallproliferativemembranewerecompletelyremoved,andretinectomywasperformedwhennecessary.Themeanfollow-upwas12.5months.Theprimaryandfinalanatomicsuccessrate,visualacuityandcomplicationswererecordedandanalyzed.RESULTS:Primaryanatomicsuccessratewasachievedin35of40eyes(87.5%)andthefinalanatomicsuccessratewas100%.ThemostcommoncauseofredetachmentwasrecurrentPVR.Thebest-correctedvisualacuity(BCVA)atfinalfollow-upwasimprovedin34eyes(85%),remainedstablein1eye(2.5%),andworsenedin5eyes(12.5%).Themeanvisualacuityatfinalfollow-upwasimprovedsignificantly(P=0.000).CONCLUSION:ThisretrospectivestudyprovidesevidencethatvitrectomywithoutscleralbucklingseemedtobeaneffectivetreatmentforinferiorbreakRDwithPVR.Withcompleteremovalofvitreousandproliferativemembranesandtimingofretinectomy,theinferiorbreakswhichcomplicatedwithPVRcouldbeclosedsuccessfullywithoutadditionalscleralbuckling.

  • 标签: RETINAL DETACHMENT INFERIOR RETINAL BREAK PROLIFERATIVE