目的探讨先天性小耳畸形发病的危险因素以及临床听力学特征。方法对2018~2024年我院儿童听力保健门诊就诊的50例先天性小耳畸形患儿及同期来院就诊的90例健听儿童的临床资料进行回顾性分析。结果50例小耳畸形患儿中,54%为男性,60.9%的...目的探讨先天性小耳畸形发病的危险因素以及临床听力学特征。方法对2018~2024年我院儿童听力保健门诊就诊的50例先天性小耳畸形患儿及同期来院就诊的90例健听儿童的临床资料进行回顾性分析。结果50例小耳畸形患儿中,54%为男性,60.9%的单侧畸形为右侧受累,70.4%小耳畸形伴外耳道狭窄或闭锁,82%为单发小耳畸形。50例小耳畸形患儿按照Marx分级:Ⅰ级7例,Ⅱ级15例,Ⅲ级28例;平均ABR气导阈值分别为Ⅰ级60.71±7.51 dB nHL、Ⅱ级75.33±2.56 dB nHL、Ⅲ级83.74±2.22 dB nHL,不同分级听力阈值存在显著差异。生活在矿区、孕期前3个月服用上感药物、孕期用药史、出生时低体重等发生小耳畸形的可能性更高。结论生活在矿区、孕期患病、孕期前3个月服用上感药物、孕期用药史、低体重儿等是小耳畸形的高风险因素;小耳畸形程度越重,听力损失越重。展开更多
Objective To study characteristics of hearing loss after exposure to moderate noise exposure in C57BL/6J mice. Methods Male C57BL/6J mice with normal hearing at age of 5-6 weeks were chosen for this study. The mice we...Objective To study characteristics of hearing loss after exposure to moderate noise exposure in C57BL/6J mice. Methods Male C57BL/6J mice with normal hearing at age of 5-6 weeks were chosen for this study. The mice were randomly sclccted to be studied immediately after exposure （Group P0）, or 1 day （Group P1）, 3 days （Group P3）, 7 day （Group P7） or 14 days （P14） after exposure. Their before exposure condition served as the normal control. All mice were exposed to a broad-band white noise at 100 dB SPL for 2 hours, ABR thresholds were used to estimate hearing status at each time point. Results ABR threshold elevation was seen at every tested frequency at P0 （P〈0.01）. Elevation at high-frequencies （16 kHz and 32 kHz） was greater than at lower frequencies （4 kHz and 8 kHz, P〈0.05）. From P1 to P14, ABR thresholds continuously improved, and there was no significant difference between P14 and before exposure （P〉0.05）. Conclusion There is a frequency specific re- sponse to 100 dB SPL broad-band white noise in C57BL/6J mice, with the high-frequency being more susceptible. Hearing loss induced by moderate noise exposure appears reversible in C57BL/6J mice.展开更多
文摘目的探讨先天性小耳畸形发病的危险因素以及临床听力学特征。方法对2018~2024年我院儿童听力保健门诊就诊的50例先天性小耳畸形患儿及同期来院就诊的90例健听儿童的临床资料进行回顾性分析。结果50例小耳畸形患儿中,54%为男性,60.9%的单侧畸形为右侧受累,70.4%小耳畸形伴外耳道狭窄或闭锁,82%为单发小耳畸形。50例小耳畸形患儿按照Marx分级:Ⅰ级7例,Ⅱ级15例,Ⅲ级28例;平均ABR气导阈值分别为Ⅰ级60.71±7.51 dB nHL、Ⅱ级75.33±2.56 dB nHL、Ⅲ级83.74±2.22 dB nHL,不同分级听力阈值存在显著差异。生活在矿区、孕期前3个月服用上感药物、孕期用药史、出生时低体重等发生小耳畸形的可能性更高。结论生活在矿区、孕期患病、孕期前3个月服用上感药物、孕期用药史、低体重儿等是小耳畸形的高风险因素;小耳畸形程度越重,听力损失越重。
基金supported by grants from the Liaoning Science and Technology Project(No.2011225017,2012225021)the National Basic Research Program of China(973 Program)(2012CB967900,2012CB967901)+2 种基金supported by the grants from the Beijing Natural Science Foundation(5122040)the China Postdoctoral Science Foundation(201003779,20100470103)the National Natural Science Foundation of China(NSFC,31040038)
文摘Objective To study characteristics of hearing loss after exposure to moderate noise exposure in C57BL/6J mice. Methods Male C57BL/6J mice with normal hearing at age of 5-6 weeks were chosen for this study. The mice were randomly sclccted to be studied immediately after exposure （Group P0）, or 1 day （Group P1）, 3 days （Group P3）, 7 day （Group P7） or 14 days （P14） after exposure. Their before exposure condition served as the normal control. All mice were exposed to a broad-band white noise at 100 dB SPL for 2 hours, ABR thresholds were used to estimate hearing status at each time point. Results ABR threshold elevation was seen at every tested frequency at P0 （P〈0.01）. Elevation at high-frequencies （16 kHz and 32 kHz） was greater than at lower frequencies （4 kHz and 8 kHz, P〈0.05）. From P1 to P14, ABR thresholds continuously improved, and there was no significant difference between P14 and before exposure （P〉0.05）. Conclusion There is a frequency specific re- sponse to 100 dB SPL broad-band white noise in C57BL/6J mice, with the high-frequency being more susceptible. Hearing loss induced by moderate noise exposure appears reversible in C57BL/6J mice.
