Pratt H, Martin W H, Schwegler J W
Garfield Auditory Research Laboratory, Department of Otorhinolaryngology and Bronchoesophagology, Temple University Medical School, Philadelphia, PA 19140.
Electroencephalogr Clin Neurophysiol. 1992 Aug;83(2):153-61. doi: 10.1016/0013-4694(92)90029-h.
Auditory brain-stem evoked potentials (ABEPs) were recorded during surgical procedures which exposed the cerebello-pontine angle (CPA) in humans. Recordings made with the CPA contralateral to stimulus exposed were compared with those obtained with the skin sutured at the end of surgery. Single-channel as well as 3-channel Lissajous' trajectory (3-CLT) analyses were used to evaluate the effect of the surgical exposure on ABEP. The results suggest that exposure of the CPA contralateral to the stimulated ear did not affect dipole equivalent orientation nor magnitude, but did affect timing of the recorded activity being more pronounced for segments 'd'-'e' (corresponding to waves IV-V) than for 'a'-'b' (waves I-II). The results imply that the effects of disrupting the volume conductor may have been overwhelmed by other effects, such as local temperature changes. These changes, although not associated with clinical sequella, should be accounted for when analyzing subtle quantitative changes involving surgical exposures.
在人类小脑脑桥角（CPA）暴露的外科手术过程中记录听觉脑干诱发电位（ABEP）。将刺激侧对侧CPA暴露时的记录与手术结束时皮肤缝合后的记录进行比较。采用单通道以及三通道利萨如图形轨迹（3-CLT）分析来评估手术暴露对ABEP的影响。结果表明，刺激耳对侧CPA的暴露不影响偶极等效方向和大小，但会影响记录活动的时间，对于“d”-“e”段（对应于波IV-V）比“a”-“b”段（波I-II）更明显。结果意味着破坏容积导体的影响可能被其他影响所掩盖，例如局部温度变化。这些变化虽然与临床后遗症无关，但在分析涉及手术暴露的细微定量变化时应予以考虑。
