| AimThe aim of newborn hearing screening (NHS),which has been widespreadly implemented overseas, is that to find out the deaf neonates before 6 monthes of age, and to take the neonates with permanent hearing loss under scientific intervention.lt is pivotal that finding out the deaf baby no later than 6 months of age.If a baby is initiated scientific intervention process after he or she was found with sempiternal hearing loss by the age of 6 months,he or she could has the ability of speaking the same as the normal ones by the preschool age,even if he or she is deaf.Unfortunately,it is diffcult to find the baby with pernanent hearing loss early in a population presents with a wide range developmental levels and abilities before 6 months old.And most of the normal newborns and developmentally delayed ones have no hearing loss,just a few ones with permanent hearing loss,and there is no single behavioral or physiological tool available to accurately identify the hearing impaired babies. Additionally, the uncooperative baby in the process of test and the more false positive rate of newborn hearing screening itself makes it worse.We study the hearing screening characteristics of normal newborns bytrasiently evoked otoacoustic emission (TEOAE) echo-screen mode of Capella otoacoustic emission apparatus;we also investegated the clinic application of twice-retest method and cross-check principle;Finally,we sum up our experiences in this study and establish the newborn hearing screening system.MethodBy the retrospective studies of 147 newborns from the department of obstetrics, The babies included in this study were all in l-3days old,born with full months,with a weight of no less than 2.5Kg,with physiological reflects,without any abnormalities and their mother with no histiory of diseases and drug use during pregancy.The baby first underwent distortion product otoacoustic emission(DPOAE)examination,then they were examined by Capella otoacoustic emission with the srounding noise less than 40dB SPL.A11 the babies failed the initial screening were retested prior to discharge,and the newborns who failed the first retest were reecalled by one month to 42days of age.Tthe babies who failed the second retest should be refer to audiologist and otologist for hearing and medical assessment. And analysis the clinic application of the twice-retest method and the cross-check principle in the audiologic assessment of babies with suspected hearing loss.Finaly,we summarized all the data of hearing screening and established the system of newborn hearing screening.Results1. Of the 147 cases,both ears were found "refer"in 5babies,and they passed the examination of auditory brainstem response(ABR) at 42 days old, left ears were found "refer"in 6babies in the initial screening and they passed one month later.The mean time for the examination of each ear was (23.5+20.9)s and the rate of "pass" and "refer"between both ears or both genders was similar(p>0.05). The rate of refer is 3.4% (5/147 ) and all the babies in this study have not been found with any hearing loss after theywere 6 months old.2. In the 440 cases,who underwent TEOAE echo-screen mode of Capella otoacoustic emission apparatus.both ears were found "pass"in 380 babies(3 80/440) in the initial screening, and the 60 failed babies(60/440=13.6%)comprises 32 cases(32/60) with both ears,16cases with right ear and 12 cases with left ear. After all the failed neonates were retested prior to discharge.we found 36 failed neonates,17 subjects with both ears, 9subjects with right ear and 10 subjects with left ear. When the 36 failed neonates were retested by the same hearing screening apparatus at one month to 42 days of age,we only found 16 refered results with both ears (16/440=3.6%). All the 440 subjects were found without any hearing loss and have prisented canonical babbling stage.3. In the 440 cases ,there are two especial cases:one is a male baby was refered after the 2nd retest,but he passed the auditory brainstem response(ABR) examination with both ear's thresholds of 3... |
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