Inui H, Murai T, Matsunaga T
Department of Otorhinolaryngology, Nara Medical College, Japan.
Eur Arch Otorhinolaryngol. 1995;252(3):181-5. doi: 10.1007/BF00178109.
Auditory brainstem responses (ABRs) were measured ipsilaterally (n = 13) or contralaterally (n = 5) after inducing permanent right and left anterior inferior cerebellar artery (AICA) occlusion. Three types of wave patterns were classified when ABRs were recorded ipsilaterally. In type 1 (n = 4) all components disappeared; in type 2 (n = 2) all components disappeared transiently and then reappeared; and in type 3 (n = 7) only the latency difference between components I and IV increased. These findings indicate that all components reappeared in type 2 responses because cochlear blood flow was re-established quickly by collateral circulation, while type 3 changes reflected the relative sensitivity of the cochlea to ischemic damage when compared with the rest of the auditory pathways. When the ABRs were recorded contralaterally, characteristic findings included a delay in latency of component IV and a significant increase in inter-peak latency in components I-IV and IIb-IV.
在造成永久性右侧和左侧小脑前下动脉（AICA）闭塞后，分别从同侧（n = 13）或对侧（n = 5）测量听觉脑干反应（ABR）。在同侧记录ABR时，可将波形分为三种类型。在1型（n = 4）中，所有成分均消失；在2型（n = 2）中，所有成分短暂消失后又重新出现；在3型（n = 7）中，仅I波和IV波之间的潜伏期差异增加。这些发现表明，2型反应中所有成分重新出现是因为侧支循环迅速重建了耳蜗血流，而3型变化反映了与听觉通路其他部分相比，耳蜗对缺血性损伤的相对敏感性。当从对侧记录ABR时，特征性表现包括IV波潜伏期延迟以及I-IV波和IIb-IV波的峰间潜伏期显著增加。
