声导抗基础知识

声导抗基础知识培训TympanometryandAcousticReflexMeasurements鼓室声导抗和声反射测试+Infanttestrecommendations婴儿测试的推荐方法现在是1页\一共有33页\编辑于星期三Soundtravel声音传导现在是2页\一共有33页\编辑于星期三Gettingsoundintoadifferentmedium

声音在不同媒介中的传导Mostofthesoundenergyisreflectedwhenconfrontingaanothermedium...大部分声能在临界面处被反射回来…becausedifferentmediaaremoreorlesseasytobringintomotion(impedance)因为不同媒介的声阻抗是不同的现在是3页\一共有33页\编辑于星期三Theroleofthemiddleear中耳的作用

现在是4页\一共有33页\编辑于星期三TheOssicles听小骨Malleus锤骨Incus砧骨Stapes镫骨Threesmallbonesformingachainbetweenthetympanicmembraneandtheinnerear听骨链位于鼓膜和内耳之间，由3块听小骨组成Airbornesoundwaveenergybecomesmechanicalvibration空气传导的声波能量转换为机械振动Compensatesfortheair-fluidimpedancedifference补偿气液相不同媒介的导抗差现在是5页\一共有33页\编辑于星期三TheMiddleearanatomy中耳解剖AirAirAirpressuremustbenearequalonbothsidesoftheeardruminordertooptimisemobilityofthewholesystem应使鼓膜两侧气压接近，从而保证中耳传声系统的最佳活动性TheEustachiantube(ET)ventilatesthemiddleearandallowspressureequalisation咽鼓管是中耳的通气管道，可保证中耳气压平衡TheETopenswhenswallowingoryawning吞咽和打哈欠时咽鼓管开放Innerearfluids内淋巴现在是6页\一共有33页\编辑于星期三Gettingsoundintoadifferentmedium

声音在不同媒介中的传导The“stiletto”principle:圆锥效应Forceiscollectedoveralargerareaandfocusedonasmallerarea(B)作用力在锥底收集后聚焦到锥尖现在是7页\一共有33页\编辑于星期三Howdowetestthemiddleear?

如何检测中耳功能现在是8页\一共有33页\编辑于星期三中耳测试精密的中耳系统高精度的测试高质量控制系统现在是9页\一共有33页\编辑于星期三Partoftheprobetoneisreflected,andsomeisadmittedintothemiddleear一部分探测音被反射回来，另一部分则进入中耳Theadmittanceiscontinuouslymeasuredbyamicrophone声导纳通过麦克风持续测量计算出来Admittance-lettingthesoundwavein

声导纳－将声波导入现在是10页\一共有33页\编辑于星期三鼓室图中耳–劲度TPP(=MEP?)AdmittancePressure现在是11页\一共有33页\编辑于星期三Tympanometry鼓室声导抗Admittance-200daPa200daPa0EarcanalpressureAdmittance声导纳-200daPa200daPa0Earcanalpressure外耳道压强1&3:Pressurestiffensthetympanicmembranesotheprobetonebouncesback,andthesoundlevelinthemiddleeardecreases1和3：大压强使鼓膜僵硬从而探测音多被反弹回来，进入中耳的声能减少2:Whenpressureisequalonbothsides,thesoundlevelinthemiddleearisatmaximum2：鼓膜两侧压力相等时传入中耳的声能最大

123现在是12页\一共有33页\编辑于星期三TheTympanogramcurve,ECVandTPP

鼓室导抗图形，等效外耳道容积和峰压点TheTPPapproximatesthemiddleearpressure峰压点近似于鼓膜内侧的中耳压力ECVTotalAdmittanceoftheearcanalandthemiddleear外耳道和中耳的声导纳总值TPPPressuresweepThe226Hzadmittanceoftheairintheearcanalisdirectlyproportionaltothevolumeofthatair.ThatgivesustheEquivalentEarCanalVolume,ECV以226Hz为探测音，测试探头与鼓膜之间的空气导纳值为外耳道容积，即等效外耳道容积现在是13页\一共有33页\编辑于星期三ECVTotalAdmittanceSATPPSATPPTheTympanogramcurveandbaselinecompensation鼓室导抗图形和基线补偿SubtractionoftheECVcontributiongivesusabaselinecompensatedtympanogram去除外耳道容积成分后的鼓室图称为基线补偿鼓室导抗图PeakadmittancebecomesStaticAdmittance,SA该图峰值处的声导纳称为静态声导纳(SA)TheSAistheadmittanceofthemiddleearalone.Nowwecanusethenormativedata!SA等于中耳的声导纳值现在是14页\一共有33页\编辑于星期三-2002000TypeAd:OssiculardiscontinuityoragerelatedhypermobilityAd型：听骨链中断或鼓膜松弛-2002000TypeA:NormalA型：正常-2002000TypeB:“Flat”-EffusionorperforatedeardrumdependingonECVvalueB型：平坦型。鼓室积液或鼓膜穿孔，根据ECV值区分-2002000TypeAs:PossibleeffusionorotosclerosisAs型：鼓室积液可能或耳硬化症-2002000TypeC:AbnormalpressureC型：负压型TheTympanogramcurveclassification,Type鼓室导抗图形分类现在是15页\一共有33页\编辑于星期三SATWSA/2PressureAdmittanceTheTympanogramcurveandTympanometricWidth

鼓室导抗图形与鼓室图宽度（TW）TympanometricWidthquantifythesteepnessofthetympanogramTW决定鼓室导抗图的坡度Normativedataexistfordifferentagegroups不同年龄组标准化值不同TWandSAarethecriteriausedintheASHAtympanometricscreeningprotocol美国社会卫生学会的鼓室声导抗筛查方案把TW和SA作为诊断指标现在是16页\一共有33页\编辑于星期三226Hz:Differentconfigurationsoftympanometricresults

226Hz鼓室声导抗测试结果与疾病的关系Tympanometryisaninvaluablediagnostictoolwhencombinedwithotheraudiologicaltests鼓室声导抗与其它听力学测试结合是不可替代的诊断工具疾病早期中耳积液中耳积液听骨链中断鼓膜病变耳硬化症锤骨固定咽鼓管阻塞鼓膜置管鼓膜穿孔耵聍栓塞、探头叩堵塞现在是17页\一共有33页\编辑于星期三Thetwomiddleearmuscles中耳肌121:Tensormuscle鼓膜张肌2:StapediusMuscle镫骨肌Themusclesarebelievedtostabilisethemechanicalsystemandprotectthecochleafromexcessivelowfrequencyvibration中耳肌可稳定中耳机械系统，并保护耳蜗免受低频强声损伤现在是18页\一共有33页\编辑于星期三TheAcousticReflex声反射Loudsoundsmakethestapediusmusclecontract.Thismakesthemiddleearsystemstiffer...强声刺激可使镫骨肌收缩，从而增加中耳传声系统的劲度…andlesslowfrequencysoundcangetthroughthemiddleear因而进入中耳的低频声波减少现在是19页\一共有33页\编辑于星期三Stapediusmusclecontrolledbyfacialnerve(CNVII)镫骨肌由第七对颅神经－面神经支配Networkinbrainstemconsistsofipsilateralandcontralateralpaths脑干层面由同侧和对侧神经通路组成Reflexactivatedonbothears,evenwhenstimulationonlyoccursinoneear一侧耳受到刺激时，双侧镫骨肌都会收缩Comparisonofipsilateralvs.contralateralacousticreflexeshelpstodeterminesiteoflesion对比同侧和对侧声反射有助于判断病变部位TheMiddleear-Immittancetests中耳声导纳测试Acousticreflexthreshold声反射阈现在是20页\一共有33页\编辑于星期三声反射AdmittanceTimeDeflection0.02蹬骨肌现在是21页\一共有33页\编辑于星期三0.000.0280dBHL0.000.0285dBHL0.000.0295dBHL0.000.0290dBHLDeflectioncriterion声导纳偏移标准Itisusefultostudythegrowthwithintensitytoconfirmareflexthreshold继续增加声强观察偏移变化有助于进一步明确声反射阈?!AcousticReflexThresholds声反射阈Loudstimuliarepresented,whilsttheadmittanceismeasured强声刺激出现时，可测试出声导纳值的变化现在是22页\一共有33页\编辑于星期三声反射测试–高精度的挑战鼓膜处压力为TPP值时中耳蹬骨肌反射状况最佳正确的声反射是刺激音引起导纳在TPP处的变化耳道或中耳压力的改变导致错误的声反射对于鼓膜活动度过大可进行TPP补偿现在是23页\一共有33页\编辑于星期三Threshold+10dB,10secondsstimulustime声反射阈上10dB给声，刺激时程10s0510secondsAdmittancechangeHalf-LifeTime(HLT),thetimeafterstimulusonsetwhentheadmittancedeflectionhasdecreasedby50%.半衰期是指声反射振幅减少50％的时程Ahalf-lifetimevalue<5secondsisindicativeoftumour半衰期小于5秒提示蜗后病变，常见的疾病是听神经瘤Noreflexdecaypresent阴性AdmittancechangeMax50%ofMaxHLT0510secondsReflexdecaypresent!阳性AcousticReflexDecay声反射衰减现在是24页\一共有33页\编辑于星期三Thereflexshouldbeactivatedinbothearsevenifstimulatedinonlyoneear单耳刺激声可激活双耳声反射Theuppernormalintensitylimitforreflexthresholdsinadultsis95-100dBHL正常成人声反射阈上限是95－100dBHLReflexthresholdscannotbedeterminedifthereisaproblemwiththemiddleear

中耳疾病时不能测出声反射阈BroadBandNoiseprovokesareflexatabout10-15dBlowerthanpuretonestimuli宽带噪声声反射阈较纯音刺激声低10－15dBDeterminestypeofhearinglosswhencomparedwiththeaudiogram声反射阈与听力图比较可帮助判断耳聋类型Decayswithneuralfatigue(typically8thnervetumour)

衰减提示听神经疲劳，是听神经肿瘤的典型表现AcousticReflexfeatures声反射特征现在是25页\一共有33页\编辑于星期三DifferentconfigurationsofAcousticReflexresults声反射结果与疾病的关系Usingthiskindoftablemakesreflexinterpretationeasier使用该表格有助于判断声反射的临床意义病变部位/患耳中耳/右中耳/左耳蜗/右耳蜗/左听神经/右听神经/左面神经/右面神经/左脑干/右脑干/左脑干/中线现在是26页\一共有33页\编辑于星期三226Hzprobetone:Normaltympanograminabnormalear!226Hz探测音：异常中耳显示正常鼓室导抗图Tympanometryininfantsyoungerthan4-7months4－7个月以下婴儿的鼓室声导抗226HzprobetoneTheinfantouterandmiddleearsarestilldeveloping,anddonotvibratewithsoundthesamewayadultearsdo.婴儿外耳和中耳正处于发育期，与成人的声波振动方式不同Use1000Hzprobetoneininfants推荐使用1KHz探测音现在是27页\一共有33页\编辑于星期三Tympanometryininfants婴儿鼓室声导抗1000Hztympanometryclearlyindicatesabnormalmiddleearfunction!1kHz鼓室声导抗明确显示中耳功能异常Normal226Hztympanogramsforbothears!226Hz鼓室声导抗显示双耳正常Acousticreflexesconfirmahealthyrightsidemiddleear.声反射证实右侧中耳功能正常现在是28页\一共有33页\编辑于星期三HoweasilycanImovethisme－chanicalsystem?怎样轻而易举的推动这个机械系统？Traditionaladmittancemagnitudetympanometry

传统鼓室声导抗中声导纳的成分现在是29页\一共有33页\编辑于星期三B/Gcomponenttympanogram声纳/声导成分鼓室导抗图B:Susceptance声纳G:Conductance声导现在是30页\一共有33页\编辑于星期三NowIcanseenotonlyhoweasilyIcanmovethesystem,butIcanactuallyfindoutwhy!现在我不仅能轻而易举的推动它，而且还明白了其中的原因！SusceptanceandConductancemagnitude

tympanometry声导与声纳现在是31页\一共有33页\编辑于星期三TraditionalbaselinecompensationEarc