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1、临床听力概述(Clinicalhearingoverview)ThispostismainlyaboutIstartedthisprojectfromcochlearfor08years,10yearstostudyinChineseUniversityHongKongotologyaudiology,theexperienceintodailyclinicalwork,emphasisonclinicalaudiology,wehopetohelp.Thetextmaybeveryrough,ischatting,notaca
2、demicpapers,hopeandunderstanding!Ontheother,someknowledgeisrecalled,noaccesstotextbooks,somaybewrong,pleasecriticizeandcorrect・OneClinicaloutlineAsanotolaryngologydoctor,alotofpeoplethinkistheentryofeartounderstand,adissectiondifficult,twohearingdifficult,threedoctor
3、,fourentrydifficultoperation.Ifyouwanttolearn,wemustcontactwiththepatient,moreaccesstoteachingmaterials・Inclinicalwork,themostimportantofthehearingexaminationIthinkaudiometry(puretoneaudiometry,PTA),inHongkong,theymostoftendolisteningtestisPTA,ABR,rarelydoelectrophys
4、iologyaudiometry.Ithinkthemainreasonis:PTAcoversallthecommonlyusedfrequencyof250Hzto8000Hz,andthecorrespondingthresholddeterminationforeachfrequency,canwellreflectthesituationofahearingimpairedhearing.SoPTAisthemostdirectandeffectiveeconomichearingtests.HowtoreadtheP
5、TA?Thereareseveralpoints:1,airconduction(AC)thresholdisalwayshigherthantheboneconductionthreshold(BC)・2,judge(conductivedeafnessACabnormal,normalBC),sensorineuralhearingloss(AC,BC,mixeddeafness(off)ACandBCarenotnormal,butbetweenthetwoairbonegap(ABG))・3,thehighestbone
6、conductionstimulionly60~65dB,sotheboneconductionthresholdto60~65dBwillnotgoup.4,thedecisionthresholdiscommonlyusedinclinical500,2000Hz1000,theaveragehearingthreshold,Hongkongonly500and1000,theconventional20004000Hz,iftheairconductionthreshold,normal(lessthan20dB)will
7、nothavemeasuredtheboneconduction.5,presbycusis,induceddeafness(cochlea)oftensee4000Hzthresholddecreased・6,whentheABGisgreaterthan50dB,andthetympanicmembraneintegrityistobeconsideredtheossicularchaindiscontinuityorfixationofthestapesotosclerosisandotherrarediseases・Th
8、echaracteristicsofhearing7,Meniere'sdiseaseisthechangeoflowfrequencyinductiondeafness,thisisbecauseinthelymphaticfluid,highfrequenc
