Skarzynski Henryk, Lorens Artur, Zgoda Małgorzata, Piotrowska Anna, Skarzynski Piotr Henryk, Szkielkowska Agata
Institute of Physiology and Pathology of Hearing, Warsaw, Poland.
Acta Otolaryngol. 2011 Jul;131(7):740-9. doi: 10.3109/00016489.2011.557780. Epub 2011 Apr 15.
This study shows that by using the round window approach and deep insertion, it is possible to reduce electrode insertion trauma (EIT), as indicated by the results of the hearing preservation marker.
In this prospective study EIT was evaluated in 42 subjects with low frequency hearing before surgery with 28 mm round window deep insertion.
The degree of hearing preservation was a marker of EIT. Pure tone audiometry, monosyllable testing was conducted preoperatively and then at 3, 6, and 13 months after surgery.
Immediate hearing preservation (3 months postoperatively) was 92.9% (39/42). The surgery-related hearing preservation 13 months after surgery varied from 85% (34/40) to 90% (36/40). The ipsilateral implanted ear showed significant differences between preoperative and postoperative hearing thresholds (p < 0.005). Comparisons of thresholds for the control ear showed a significant difference between preoperative and postoperative thresholds tested 13 months after surgery (p < 0.05). When the subtraction factor of the mean contralateral hearing loss for each tested frequency for the same time interval was applied to the implanted ear, no significant hearing loss was found, showing that postoperative ipsilateral progressive hearing loss was caused by etiology rather than surgery.
本研究表明，采用圆窗入路和深插入技术，如听力保留指标结果所示，有可能减少电极插入创伤（EIT）。
在这项前瞻性研究中，对42例术前低频听力正常的受试者进行28毫米圆窗深插入，评估EIT情况。
听力保留程度是EIT的一个指标。术前以及术后3个月、6个月和13个月进行纯音听力测定和单音节测试。
即刻听力保留（术后3个月）率为92.9%（39/42）。术后13个月与手术相关的听力保留率在85%（34/40）至90%（36/40）之间。同侧植入耳术前和术后听力阈值存在显著差异（p < 0.005）。对照耳阈值比较显示，术后13个月测试的术前和术后阈值之间存在显著差异（p < 0.05）。当将同一时间间隔内每个测试频率的对侧平均听力损失的减法因子应用于植入耳时，未发现明显听力损失，表明术后同侧渐进性听力损失是由病因引起而非手术所致。
