OBJECTIVE We sought to define the significance of wave I loss of brainstem auditory evoked potentials (BAEPs) during microvascular decompression (MVD) surgery for hemifacial spasm. METHODS Out of 670 patients, 36 showed wave V loss during MVD surgery. These patients were classified into the following two groups based on wave I loss: Total wave loss, including wave I loss, and wave V loss with persistent wave I. We analyzed the differences in postoperative complications between the groups. We also investigated when wave I loss occurred during MVD surgery. RESULTS Of the 36 patients, 24 (66.7%) exhibited wave I persistence and 12 (33.3%) exhibited total wave loss. The patients who showed total wave loss were significantly more likely to exhibit postoperative hearing loss (p = 0.009). In addition, these patients exhibited a significantly higher frequency of postoperative complications such as dizziness and tinnitus (p = 0.002 and p = 0.031, respectively). Total wave loss occurred more frequently after the decompressive procedure of MVD surgery. CONCLUSIONS Total wave loss, including wave I loss, was more closely associated with severe postoperative complications. Total wave loss occurred more frequently after the decompressive procedure of MVD surgery. SIGNIFICANCE These findings suggest the significance of wave I loss of BAEPs.

中文翻译：

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面肌痉挛微血管减压术中脑干听觉诱发电位I波丧失的意义

目的 我们试图确定在面肌痉挛的微血管减压 (MVD) 手术期间脑干听觉诱发电位 (BAEP) 的 I 波丧失的意义。方法 在 670 名患者中，36 名在 MVD 手术期间出现 V 波丢失。这些患者根据 I 波丢失分为以下两组：总波丢失，包括 I 波丢失和 V 波丢失伴持续 I 波。我们分析了各组术后并发症的差异。我们还调查了 MVD 手术期间发生 I 波丢失的时间。结果 在 36 名患者中，24 名 (66.7%) 表现出 I 波持续性，12 名 (33.3%) 表现出总波损失。表现出全波损失的患者更可能出现术后听力损失（p = 0.009）。此外，这些患者出现术后并发症如头晕和耳鸣的频率明显更高（分别为 p = 0.002 和 p = 0.031）。MVD手术减压手术后总波损失发生率更高。结论 总波损失，包括波 I 损失，与严重的术后并发症更密切相关。MVD手术减压手术后总波损失发生率更高。意义 这些发现表明 BAEP 丢失的第一波的意义。MVD手术减压手术后总波损失发生率更高。意义 这些发现表明 BAEP 丢失的第一波的意义。MVD手术减压手术后总波损失发生率更高。意义 这些发现表明 BAEP 丢失的第一波的意义。