Evaluation of the Carhart Effect in Congenital Middle Ear Malformation with Both an Intact External Ear Canal and a Mobile Stapes Footplate
Evaluation of the Carhart Effect in Congenital Middle Ear Malformation with Both an Intact External Ear Canal and a Mobile Stapes Footplate
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DOI：
10.1159/000323010
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发表时间：
2011-01-01
期刊：
影响因子：
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通讯作者：
Yamasoba, Tatsuya
中科院分区：
文献类型：
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作者：
Sakamoto, Takashi;Kakigi, Akinobu;Yamasoba, Tatsuya
为探讨Carhart效应对先天性中耳畸形的影响，对41耳具有完整外耳道和可活动距骨平台的先天性中耳畸形患者的临床资料进行了回顾分析。根据平均气骨间隙缩小的程度将手术分为成功或不成功两组。两组在1和2 kHz时的纯音平均变化和骨传导(BC)阈值的变化方面差异有统计学意义。线性回归分析显示，在总体水平和所测试的4个频率上，BC阈值的变化与术后BC阈值之间的相关性很弱。踝关节强直是Carhart效应的主要原因。本研究表明，在先天性中耳畸形中，Carhart效应不仅是由听骨强直引起的，也是由听骨链的其他类型的断裂引起的。版权所有(C)2011 S.Karger AG，巴塞尔
The medical charts of 41 ears with congenital middle ear malformation with both an intact external ear canal and a mobile stapes footplate were reviewed retrospectively to study the Carhart effect. The operations were categorized as successful or unsuccessful according to the extent of decrease in the average air-bone gap. Statistically significant differences were observed between the 2 groups with respect to the changes in pure-tone average and the changes in the bone conduction ( BC) threshold at 1 and 2 kHz. Linear regression analysis revealed weak correlations between the change in the BC threshold and the postoperative BC threshold at an overall level and at the 4 frequencies tested. Stapes ankylosis is a main cause of the Carhart effect. The present study showed that in congenital middle ear malformation, the Carhart effect was caused not only by stapes ankylosis but also by other types of disruption in the ossicular chain. Copyright (C) 2011 S. Karger AG, Basel