Szkiładź E, Checiński S, Bidziński J, Bacia T
Kliniki Neurochirurgii AM, Warszawie.
Pol Tyg Lek. 1994;49(4-5):75-8.
Somatosensory evoked potentials (SEP) were recorded from the scalp in 47 patients and intraoperatively from the exposed cortex in 30 persons with various forms of focal epilepsy. SEP from stimulation of the median nerve were recorded from the standard derivations: F3, F4, C3, C4, T3, T4, P3, P4 and/or electrodes placed on the exposed cortex. Primary cortical negative (N20) and positive (P20) responses were analyzed. Surface recordings were normal in majority of cases (79%). The most common abnormality was the lack of cortical waves in the damaged area (mostly frontal region) or the absence of cortical responses in the whole hemisphere when central area was involved. Comparing cortical responses obtained before and during operation we found that they were similar (polarization, latency) in the majority of cases there was no response before and intraoperatively. SEP are primarily influenced by organic brain damage symptoms, but not by functional brain changes.
在47例患者中从头皮记录体感诱发电位（SEP），并在30例患有各种类型局灶性癫痫的患者术中从暴露的皮质记录SEP。通过标准导联记录正中神经刺激后的SEP：F3、F4、C3、C4、T3、T4、P3、P4和/或置于暴露皮质上的电极。分析了初级皮质负向（N20）和正向（P20）反应。大多数病例（79%）的表面记录正常。最常见的异常是受损区域（主要是额叶区域）缺乏皮质波，或者当涉及中央区域时整个半球无皮质反应。比较手术前和手术期间获得的皮质反应，我们发现大多数病例中它们相似（极化、潜伏期），术前和术中无反应。SEP主要受器质性脑损伤症状影响，而非功能性脑变化影响。
