Four divers were compressed to 350 m to observe changes in hearing threshold, brainstem evoked response and acoustic impedance. The divers experienced no tinnitus, impairment of bearing, earache daring compression. Ex...Four divers were compressed to 350 m to observe changes in hearing threshold, brainstem evoked response and acoustic impedance. The divers experienced no tinnitus, impairment of bearing, earache daring compression. Examination showed that the threshold of tower frequency range of hearing was elevated because of the masking effect of the noise in the hyperbaric chamber. Changes in waveform and latency of brainstem evoked response were due to changes in sound wave transmission affected by the chamber pressure and a poor ratio of signal to noise in the hyperbaric environment with heliox. All these changes were transient After leaving the chamber, the hearing threshold and brainstem evoked response returned to normal. Besides, there were no changes in tympanogram, acoustic compliance and stapedius reflex before and after diving. This indicated the designed speed of compression and decompression in the experiment caused no damage to the divers' acoustic system, and the functions of their Eustachain tubes, middle and inner ears were normal during the diving test展开更多
目的通过对极重度听力损失的大前庭水管综合征婴幼儿进行听性脑干反应（ABR）和多频稳态反应（ASSR）测试，探讨其ABR检查过程中出现的声诱发短潜伏期负向波（acoustically evoked short latency negative response，ASNR）及其ASSR特...目的通过对极重度听力损失的大前庭水管综合征婴幼儿进行听性脑干反应（ABR）和多频稳态反应（ASSR）测试，探讨其ABR检查过程中出现的声诱发短潜伏期负向波（acoustically evoked short latency negative response，ASNR）及其ASSR特点。方法回顾性研究22例（42耳）极重度听力损失的大前庭水管综合征（LVAS）婴幼儿，另选择28例（56耳）极重度听力损失的非LVAS的感音神经性耳聋婴幼儿作为对照组，研究其ABR及ASSR相关性。结果①LVAS婴幼儿组ABR测试中，36耳（85．7％）记录到AsNR，在109．6 dB nHL刺激强度引出的ASNR平均潜伏期在3．04±0．22msT对照组中婴幼儿无一例记录到ASNR。②LVAS婴幼儿组ASSRNI]试在250、500和1000Hz引出率明显高于对照组，两组间差异有统计学意义（P〈0．01）。结论相比于普通的极重度感音神经性耳聋患儿，极重度听损LVAS患儿进行听力学检查时，ABR容易出现ASNR负向波，ASSR测试结果显示较高的中低频的电位反应引出率，此结果可用于临床辅助诊断大前庭水管综合征。展开更多
A frequency following response(FFR) of speech auditory brainstem response(speech-ABR) elicited by the speech syllable/da/contains three distinct waves named as D, E and F, corresponding to the structure of the stimulu...A frequency following response(FFR) of speech auditory brainstem response(speech-ABR) elicited by the speech syllable/da/contains three distinct waves named as D, E and F, corresponding to the structure of the stimulus sound. The detection and characterization of FFRs are critical in the study and application of speech-ABRs. Conventional methods detect the latencies of the waves in time domain by measuring the maximal amplitudes of the waveform in the preset windows, which suffers the problem of low quality of FFR waves. In this paper, we defined an instantaneous energy(IE) spectrum based on empirical mode decomposition(EMD)method(EMD-IE method) to detect FFR and measured the latencies of the waves. The results reveal that the FFRs are mostly evident on the second layer of the IE spectra,which would benefit the detection and measurement of the FFRs in clinic.展开更多
文摘Four divers were compressed to 350 m to observe changes in hearing threshold, brainstem evoked response and acoustic impedance. The divers experienced no tinnitus, impairment of bearing, earache daring compression. Examination showed that the threshold of tower frequency range of hearing was elevated because of the masking effect of the noise in the hyperbaric chamber. Changes in waveform and latency of brainstem evoked response were due to changes in sound wave transmission affected by the chamber pressure and a poor ratio of signal to noise in the hyperbaric environment with heliox. All these changes were transient After leaving the chamber, the hearing threshold and brainstem evoked response returned to normal. Besides, there were no changes in tympanogram, acoustic compliance and stapedius reflex before and after diving. This indicated the designed speed of compression and decompression in the experiment caused no damage to the divers' acoustic system, and the functions of their Eustachain tubes, middle and inner ears were normal during the diving test
文摘目的通过对极重度听力损失的大前庭水管综合征婴幼儿进行听性脑干反应（ABR）和多频稳态反应（ASSR）测试，探讨其ABR检查过程中出现的声诱发短潜伏期负向波（acoustically evoked short latency negative response，ASNR）及其ASSR特点。方法回顾性研究22例（42耳）极重度听力损失的大前庭水管综合征（LVAS）婴幼儿，另选择28例（56耳）极重度听力损失的非LVAS的感音神经性耳聋婴幼儿作为对照组，研究其ABR及ASSR相关性。结果①LVAS婴幼儿组ABR测试中，36耳（85．7％）记录到AsNR，在109．6 dB nHL刺激强度引出的ASNR平均潜伏期在3．04±0．22msT对照组中婴幼儿无一例记录到ASNR。②LVAS婴幼儿组ASSRNI]试在250、500和1000Hz引出率明显高于对照组，两组间差异有统计学意义（P〈0．01）。结论相比于普通的极重度感音神经性耳聋患儿，极重度听损LVAS患儿进行听力学检查时，ABR容易出现ASNR负向波，ASSR测试结果显示较高的中低频的电位反应引出率，此结果可用于临床辅助诊断大前庭水管综合征。
基金National Natural Science Foundation of Chinagrant number:F61172033
文摘A frequency following response(FFR) of speech auditory brainstem response(speech-ABR) elicited by the speech syllable/da/contains three distinct waves named as D, E and F, corresponding to the structure of the stimulus sound. The detection and characterization of FFRs are critical in the study and application of speech-ABRs. Conventional methods detect the latencies of the waves in time domain by measuring the maximal amplitudes of the waveform in the preset windows, which suffers the problem of low quality of FFR waves. In this paper, we defined an instantaneous energy(IE) spectrum based on empirical mode decomposition(EMD)method(EMD-IE method) to detect FFR and measured the latencies of the waves. The results reveal that the FFRs are mostly evident on the second layer of the IE spectra,which would benefit the detection and measurement of the FFRs in clinic.
