Due to the popularity of newborn hearing screening in China, many hearing-impaired children can be diagnosed with hearing problems shortly after birth. Once hearing loss is found, they can be used 6 months ago.Hearing aid.However, the ears of infants and young children are not yet mature, which brings many difficulties to the fitting of hearing aids.Compared with people of other age groups, infant hearing aid fitting also lacks a unified procedure. Each place has its own method, and it is difficult to define the success of infant hearing aid fitting.
For this reason, Chinese hearing aid fitting experts recommend three key points:
一是婴幼儿听力状况的鉴定。虽然行为测听结果准确，但是对于年龄在6个月以下的婴幼儿，只有使用电生理测听方法。通常我们使用短声ABR（click ABR）、短纯音ABR（toneburst ABR）和多频稳态诱发电位(ASSR)等方法。正确使用这些方法均能获得婴幼儿比较准确的听力阈值。中国听力学网收悉记者章邯女士解释，在换算电生理反应阈值和听力阈值时，最重要的是理解校正系数的应用。所谓校正系数指从ABR反应阈值，变成行为测听阈值所需要减去的分贝数。一般讲，电生理反应阈值比行为测听阈值高出5~20dB不等。低频500Hz需要减去20dB，而高频4000Hz仅需减去5dB即可。比如，用短纯音在500Hz获得ABR阈值是60dBnHL，换算成行为听力阈值便是40dBHL （60-20=40dB）。按这种方法，一般能获得婴幼儿的听力阈值，成为助听器验配的基础。
Second, the unique acoustic characteristics of infants’ ear canals must be fully considered.We know that the smaller the ear canal, the greater the resonance of the same sound intensity, that is, if we fit the hearing aid according to the 2cc indicator provided by the manufacturer, 90% of the cases will lead to excessive amplification, and yes, infants and young children are uncomfortable. , Unwilling to bringHearing aid, And even have an impact on children’s hearing.The best way to solve this problem is to test the real ear coupling cavity difference (RECD) of infants and young children.China Audiology Network believes that testing RECD is very important and is one of the most important factors to ensure the success of hearing aid fitting.
After obtaining the RECD value of infants and young children, the third factor is the evaluation of the effect of hearing aids after fitting.Generally, in the evaluation, we can use a hearing aid analyzer to use the probe microphone for real ear testing.There are several purposes for the evaluation. First, to ensure that the infants and young children wear hearing aids, the indicators can be basically met, such as gain, maximum output, etc.; and then to see if the hearing aid can amplify speech sounds most effectively. The hearing comfort of the hearing aid is not equal to Being able to speak clearly requires constant evaluation and debugging. Finally, it is necessary to determine whether the hearing aid functions are suitable for children’s use, such as directional microphones, multi-memory hearing aids, and wind noise reduction functions.These functions are not useful for all infants and young children, and need to be decided according to the specific situation.
In short, Chinese hearing aid fitting experts believe that a successful infant hearing aid fitting meets at least the above three conditions.Of course, there are other factors that need to be considered, such as inconsistent hearing loss in both ears of infants and young children, and recovery.Therefore, the fitting of hearing aids for infants and young children is essentially a continuous, gradual and systematic process.
Experts analyze the three key points of pediatric hearing aid fitting https://www.jhhearingaids.com/
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