声导抗基础知识VIP免费

.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.Soundtravel声音传导.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.Theroleofthemiddleear中耳的作用.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.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.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.Howdowetestthemiddleear?如何检测中耳功能.中耳测试•精密的中耳系统•高精度的测试•高质量控制系统.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.鼓室图中耳–劲度TPP(=MEP?)AdmittancePressure.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.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.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.-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.SATWSA/2PressureAdmittanceTheTympanogramcurveandTympanometricWidth鼓室...