Doespreoperativebacterialculturehavebearingonhealingofmastoidcavity:Aprospectivestudy

摘要： Objective:Tostudythebacteriologicalprofileinahealingmastoidcavity.Methods:Thisstudywasasinglecentreprospectivestudy.Cultureswabsfromgranulationsinthemastoidcavityweresentin40consecutivepatientswithsquamosalchronicotitismediaundergoingmastoidectomy.Cultureswereprocessedforbothaerobicandanaerobicbacteria.Results:Preoperatively:specimensfrom26outof40(60.5%)hadgrowthonculture,with22(55%)showingonlyoneorganismwhile4showingmultipleorganisms.Thecommonestorganismisolatedwaspseudomonasaeruginosa(n=15).At1monthaftermastoidctomy,11patientshadsterileculturewhile29hadgrowth,ofwhich26hadaerobicgrowthand3hadanaerobicgrowth.Pseudomonaswasseenin22patientsandstaphylococcusaureusin2patients.ThemeanMerchantscorewas2.At3months:29patients(72.5%)hadsterileculturefrommastoidcavitywhile11patients(27.5%)hadgrowthonculture.Allpositivecultureswereaerobic,includingpseudomonas(n=9)andproteus(n=2).ThemeanMerchantscorewas1.03.Ofthe40patients,16(40%)hadadifferentorganismculturedpostoperativelycomparedtopreoperativeswabs.Conclusion:Pseudomonasandproteusseemtobethemostcommonorganismsresponsibleforpersistentotorrheaaftermastoidectomy.Persistentsterileotorrheawasseenin4patients(10%)inthisgroupattheendof3months.Sterileculturesofpreoperativeswabaremorelikelytoremainsterileinthepostoperativeperiod. （共7页）