简介：BackgroundThepurposeofotomicrosurgeryinmoderntimesistoachievecompleteremovalofdisease,whichisthebasisforhearingrehabilitation.Artificialossiclesareimportantforhearingrehabilitation.Oneofthematerialsishydroxyapatitethatactsasossicularreplacementprosthesis(HAprosthesis,PORP&TORP)andiscommonlyusedassubstituteboneinclinics.AlthoughHAprosthesesfeaturegoodbiocompatibility,stabilityandcertainresistancetoinfection,thestructureofthematerialcanbedecomposedandabsorbed.Baseduponanimalexperimentsandclinicalapplication,thisarticleexplorestheinfectivityofHAprosthesesandinfluencingfactors.MaterialsandMethodsHAprostheseswereimplantedinthebullainguineapigs.InfectedHAprostheseswereexaminedunderascanningelectronmicroscope.NinetypatientsimplantedwithHAprostheseswerefollowedformorethan3months.Fivecasesthathadundergonerevisionoperationswerereported.ResultsScanningelectronicmicroscopyshowedthatthenormalcompactstructureshaddisappearedandbecomelooseininfectedHAprostheses,withtheirmicroporesinfiltratedwitheffusion,fibroustissueandinflammatorycells.Asaresult,thenormalceramicstructurewasdecomposedandthemicroporesstructuredisappeared.TheinfectedmesotympanuminthereportedcasesalsoledtoHAinfection.Theshapeandstructureofboneweredestroyed,whichwasvisiblebyvisualexaminationandlightmicroscopy.Theprocessofcholesteatomarecurrencewasalwaysassociatedwithinfection,althoughtheHAprosthesiswassometimesspared.ConclusionWhileHAprosthesisisanti-infectivetosomeextent,long-terminfectionandcholesteatomarecurrencecanleadtodestructionanddecompositionofHAprostheses.Long-terminfectedmiddleearcavity,dysfunctionalEustachiantube,residualandrecurrentcholesteatomaandotherfactorscancausedecompositionofHAprosthesisandresultinhearingloss.

简介：ObjectiveToexploretherelationshipbetweensuddensensorineuralhearingloss(SSNHL)andvascularriskfactors(includingserumlipidsanduricacid).MethodThisisaretrospectiveanalysisof100casesofSSNHLseenattheDrumTowerHospital,NanjingMedicalUniversity,betweenJan.2007andApr.2008。Patienthistory,bloodtestresultsandimagingscanswereanalyzed.Levelsoftriglyceride(TG),cholesterols(CHO),highdensitylipoprotein-cholesterol(HDL-CH),lowdensitylipoprotein-cholesterol(LDL-CH),apolipoproteinAI(ApoAI),apolipoproteinB(ApoB)anduricacid(UA)fromthesepatientswerecomparedwithacontrolgroupof56patientstreatedforvocalcordpolypsornasalseptumdeviationduringthesameperiod.Patientswithhypertension,diabetes,heart,brain,liverorkidneydisordersareexcludedfromthepresentinvestigation.ResultsHDLCHlevelwashigherandUAlevellowerinthestudygroupthanthecontrolgroup(P<0.05).HDL-CHandUAshowednosignificantdifferencesamongdifferentage-groups(P>0.05).TherewerenosignificantdifferencesinthelevelsofTG,CHO,LDL-CH,ApoAIandApoB(P>0.05).ConclusionThesedataindicatethatmetabolicdisturbancesofserumlipidsand/oruricacidmaybepotentialriskfactorsforSSNHL