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中枢神经系统感染.ppt

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Herpessimplexvirus(HSV)encephalitisHSVisthemostcommoncauseofsporadic散发的fatalencephalitisintheUnitedStates.Abouttwo-thirdsofcasespatientsover40yearsofage.Primaryherpesinfectionsmostoftenpresentasstomatitis口炎(HSVtype1)oravenereally性交的transmittedgenital生殖器eruption出疹(HSVtpye2).Thevirusmigratesalongnerveaxons轴突tosensoryganglia神经节,whereitpersistsinalatentformandmaybesubsequentlyreactivated.01ItisnotclearwhetherHSVtype1encephalitis,themostcommontypeinadults,representsaprimaryinfectionorareactivationoflatentinfection.02Neonatal新生儿的HSVencephaltisusuallyresultsfromacquisition获得oftype2virusduringpassagethroughthebrithcanalofamotherwithactivegenital生殖器的lesions.01CentralnervoussysteminvolvementbyHSVtype2inadultsusuallycausesmeningitis,ratherthanencephalitis.0201040203HSVtpye1encephalitisisanacute,necrotizing引坏死的,asymmetric不对称的hemorrhagic出血性的processwithlymphocyticandplasmacell浆细胞reaction.Usuallyinvolvesthemedialtemporalandinferiorfrontallobes.Intranuclearinclusions核内包涵体maybeseeninneurons神经元andglia神经胶质.Patientswhorecover康复期mayshowcystic囊的necrosis坏死oftheinvolvedregions.Pathology嗜酸性CowdryA型包涵体ClinicalFinding---ASymptomsandSignsTheclinicalsyndromemayincludeheadache,stiffneck,vomiting,behavioraldisorders,memoryloss,anosmia嗅觉丧失,aphasia,hemiparesis轻偏瘫,andfocalorgeneralizedseizures.Activeherpeslabialis唇疱疹isseenoccasionally,butdoesnotreliablyimplicateHSVasthecauseofencephalitis.HSVencephalitisisuauallyrapidlyprogressiveoverseveraldaysandmayresultincomaordeath.Themostcommonsequelae后遗症inpatientswhosurvivearememoryandbehaviordisturbances,reflectingthepredilection嗜好,偏爱ofHSVforlimbicstructures.12LaboratoryFindingsLaboratoryFindings---CSFTheCSFinHSVtpye1encephalitismostoftenshowsincreasedpressurelymphocyticor

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