Talking about the tinnitus test of hearing aids

1. Purpose

The tinnitus test is to collect some quantitative data, as far as possible to determine the cause, lesion location, severity, and observe the efficacy.However, because tinnitus itself is only a subjective symptom, there is currently a lack of objective test indicators to determine the presence or absence of tinnitus and the severity of tinnitus.

2. area 

Suitable for ultrasound products and all products with tinnitus treatment.

3. Tinnitus masking matching test 

1) Frequency matching of tinnitus tones 

Tinnitus can be a single tinnitus sound or several tones, either pure tones or noises. However, most patients with tinnitus are pure tones, so the frequency or maximum tone can be determined by matching the tones. An annoying theme.During the test, the subject should first understand that the tone does not belong to the category of intensity or loudness, and the two should not be confused, and then determine whether the tinnitus is pure tone, narrowband noise, or mixed sound, and the subject should be made aware that the matching sound may be It cannot be exactly the same as tinnitus, but it should be pointed out which sound is closer to tinnitus.

Due to the low reliability of tone matching, and the clinical significance of accurate matching for diagnosis and treatment, there is no clear and specific relationship between the cause of tinnitus and the matching tone frequency, so there is no need to use a tinnitus analyzer in clinical practice. Special equipment, and a pure tone audiometer can be used for tinnitus matching.

The test frequency starts from 1000Hz and the closest frequency, and the same side and opposite side can be matched. Starting from a lower intensity, the intensity of each frequency should be the same (0~15dBSL), then change the matching frequency and adjust the frequency According to the frequency classification of the pure tone audiometer, the interval can be as small as possible, and the participant can compare the test tone with the tinnitus tone. When the two are the same or similar, the test frequency is the tinnitus tone.

耳鸣音调的匹配频率,于6~12个月后重复测试,部分病人每天的重复测试频率变化也大。匹配频率变化的原因,可能与被试者对音调匹配有困难之故,但也可能因倍频混淆所致。如怀疑出现此种现象,且为了得到较为准确的音调频率匹配,可采用两者选一迫使选择的方法是:于对侧耳系列出现两种频率的声音,从1000Hz处开始,要求被试者指出那种声音的频率更接近于耳鸣,响度应与耳鸣声相同,频率增量通常为1000Hz。从试验可见:被试者仍选择5000Hz,说明较准确的匹配频率为6000Hz以下、5000Hz以上。此法的试验,再试验的可靠性较大。

Frequency of test series number comparison (kHz) Participant’s response frequency (kHz) 

1 1 and 2 2 
2 2 and 3 3 
3 3 and 4 4 
4 4 and 5 5 
5 5 and 6 5 
2) Loudness matching of tinnitus 

In order to understand the loudness of tinnitus itself, in order to have a clear understanding of the intensity required to completely mask the tinnitus, loudness matching should be done.

4. Tinnitus masking effect test

1) Minimum masking level 

It is also called the tinnitus masking curve test. It is to determine the minimum intensity level of the test sound that can just mask the tinnitus. According to the matching frequency of the tinnitus, select pure tones or narrow-band noise, and do the same side and opposite side masking test with a frequency of 250~8000Hz. The test method is similar to loudness matching. The sound intensity starts from below the threshold, and the sound is given in increments of 2dB. The sound is given intermittently. When the sound masks the tinnitus, the subject responds to this intensity level. It is the minimum masking level, and the curve formed by it is the masking curve.

The advantage of the masking curve is to understand the masking degree of tinnitus at the same frequency, distant frequency or frequency zone within a certain range of tinnitus.In order to observe the effect of treatment.

2) Time decay of masking

Use the minimum masking level for continuous masking. If the tinnitus reappears, increase the masking sound intensity by 5dB. If the tinnitus reappears, increase the intensity again. The tinnitus reappears for the third time, or the entire test time has reached 3
min,试验即结束,记录增加的掩蔽dB数。此试验对治疗最有意义,如掩蔽衰减超过10dB,完全掩蔽则不可能。衰减为0~5dB,有效率为75%,衰减10dB或更多,有效率为50%~60%。

3) Aftereffect inhibition 

也称残留抑制,是掩蔽声结束后掩蔽效应继续存在的一段短暂时间。耳鸣消失称为完全性后效抑制,如耳鸣减轻,为部分后效抑制,应用耳鸣匹配的声音或宽带噪声(3000~12000Hz),于最小掩蔽级上10dB、刺激60s。停止掩蔽声后,了解病人耳鸣声响度是否与掩蔽前相同、加重、减轻或消失,耳鸣再次出现或回复至原来响度的时间。此种时程对于预测掩蔽治疗的效果有一定意义。如出现后效抑制,掩蔽疗法有效率可达81%,无后效抑制,有效率约为60%。如出现掩蔽后加重,称为回跳。掩蔽声强度一般与后效抑制的持续时间长短无关,而与抑制的程度有关。

Leave a Reply