{"title":"电骨传导测听法测定耳硬化性耳的卡哈特缺口效应","authors":"H. Löppönen, K. Laitakari","doi":"10.1080/010503901300007399","DOIUrl":null,"url":null,"abstract":"The Carhart notch is an elevation in the middle-frequency bone-conduction threshold of an ear with clinical otosclerosis. The study population consisted of 138 patients with clinical otosclerosis. Conventional air-conduction (AC) and bone-conduction (BC) and electric bone-conduction (EBC, with Audimax 500 audiometer) thresholds were measured 2 weeks before and 7 months after stapes surgery. The EBC thresholds were converted from mA values to dB SPL to compare the results obtained with the different methods. The mean differences in the BC thresholds before and after the operation were 3.2 dB (95% CI 1.9-4.6) at 1 kHz and 7.6 dB (95% CI 6.1-9.1) at 2 kHz. The mean differences in the EBC thresholds were 5.4 dB (95% CI 3.8-6.9) at 1 kHz and 5.3 dB (95% CI 3.4-7.1) at 2 kHz. Thus, both methods showed a distinct Carhart notch effect.","PeriodicalId":76516,"journal":{"name":"Scandinavian audiology","volume":"30 1","pages":"160 - 162"},"PeriodicalIF":0.0000,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/010503901300007399","citationCount":"6","resultStr":"{\"title\":\"Carhart notch effect in otosclerotic ears measured by electric bone-conduction audiometry\",\"authors\":\"H. Löppönen, K. Laitakari\",\"doi\":\"10.1080/010503901300007399\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The Carhart notch is an elevation in the middle-frequency bone-conduction threshold of an ear with clinical otosclerosis. The study population consisted of 138 patients with clinical otosclerosis. Conventional air-conduction (AC) and bone-conduction (BC) and electric bone-conduction (EBC, with Audimax 500 audiometer) thresholds were measured 2 weeks before and 7 months after stapes surgery. The EBC thresholds were converted from mA values to dB SPL to compare the results obtained with the different methods. The mean differences in the BC thresholds before and after the operation were 3.2 dB (95% CI 1.9-4.6) at 1 kHz and 7.6 dB (95% CI 6.1-9.1) at 2 kHz. The mean differences in the EBC thresholds were 5.4 dB (95% CI 3.8-6.9) at 1 kHz and 5.3 dB (95% CI 3.4-7.1) at 2 kHz. Thus, both methods showed a distinct Carhart notch effect.\",\"PeriodicalId\":76516,\"journal\":{\"name\":\"Scandinavian audiology\",\"volume\":\"30 1\",\"pages\":\"160 - 162\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2001-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1080/010503901300007399\",\"citationCount\":\"6\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Scandinavian audiology\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1080/010503901300007399\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Scandinavian audiology","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1080/010503901300007399","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 6
摘要
Carhart切迹是临床耳硬化症患者耳中频骨传导阈的升高。研究人群包括138例临床耳硬化患者。在镫骨手术前2周和术后7个月分别测量常规空气传导(AC)、骨传导(BC)和骨电传导(EBC)阈值。将EBC阈值从mA值转换为dB SPL，以比较不同方法获得的结果。手术前后BC阈值在1 kHz时的平均差异为3.2 dB (95% CI 1.9-4.6)，在2 kHz时的平均差异为7.6 dB (95% CI 6.1-9.1)。EBC阈值在1 kHz时的平均差异为5.4 dB (95% CI 3.8-6.9)，在2 kHz时的平均差异为5.3 dB (95% CI 3.4-7.1)。两种方法均表现出明显的卡哈特缺口效应。
Carhart notch effect in otosclerotic ears measured by electric bone-conduction audiometry
The Carhart notch is an elevation in the middle-frequency bone-conduction threshold of an ear with clinical otosclerosis. The study population consisted of 138 patients with clinical otosclerosis. Conventional air-conduction (AC) and bone-conduction (BC) and electric bone-conduction (EBC, with Audimax 500 audiometer) thresholds were measured 2 weeks before and 7 months after stapes surgery. The EBC thresholds were converted from mA values to dB SPL to compare the results obtained with the different methods. The mean differences in the BC thresholds before and after the operation were 3.2 dB (95% CI 1.9-4.6) at 1 kHz and 7.6 dB (95% CI 6.1-9.1) at 2 kHz. The mean differences in the EBC thresholds were 5.4 dB (95% CI 3.8-6.9) at 1 kHz and 5.3 dB (95% CI 3.4-7.1) at 2 kHz. Thus, both methods showed a distinct Carhart notch effect.
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