阿尔茨海默病与老年精神分裂症患者的诱发电位比较

目的了解Ａｌｚｈｅｉｍｅｒ病（ＡＤ）与老年精神分裂症患者（ＳＳ）在感觉性诱发电位检查中的异同。方法共收集３９例ＡＤ患者、３４例ＳＳ患者及４０名正常老年人（ＮＣ）对照。应用丹麦仪器以及光和声刺激,完成视觉诱发电位（ＶＥＰ）和听觉诱发电位（ＡＥＰ）检查。结果发现ＡＤ组波形变异大,ＶＥＰ的Ｎ２、Ｐ３以及ＡＥＰ的Ｐ１、Ｎ１、Ｐ２、Ｎ２、Ｐ３波潜伏期明显延迟,ＶＥＰ主波Ｐ２平均波幅较ＳＳ组和ＮＣ组分别降低３２％和５７％。ＡＥＰ主波Ｐ２平均波幅较ＳＳ组和ＮＣ组分别降低３６％和７０％。ＳＳ组ＶＥＰ和ＡＥＰ的Ｎ２、Ｐ３均比ＮＣ组明显延迟。ＳＳ组ＶＥＰ和ＡＥＰ／Ｐ２波平均波幅比ＮＣ组降低分别为１６％和２０％。结论ＶＥＰ和ＡＥＰ可作为ＡＤ患者和ＳＳ患者鉴别诊断的辅助手段。

Brain evoked potentials in patients with Alzheimer's disease and schizophrenia: a comparative study

OBJECTIVE: To investigate the differences of visual evoked potentials(VEP) and auditory evoked potentials(AEP) between patients with Alzheimer's disease and schizophrenics. METHODS: Both VEP and AEP were elicited from 39 patients with Alzheimer's disease, 34 aged schizophrenics and 40 normally age-matched subjects. RESULTS: The variability of waveforms of both VEP and AEP became increased within the AD group. The AD patients presented significantly delayed latencies (N2 and P3 of VEP; P1, N1, P2, N2 and P3 of AEP) as compared to the normal controls. The P2 amplitude of VEP of AD patients was 32% lower than that of schizophrenics and 57% lower than that of the controls. The P2 amplitude of AEP of AD patients was 36% lower than that of schizophrenics and 70% lower than that of the controls. Compared with the normal controls, the schizophrenics showed reduced VEP-P2 latency, prolonged N2 and P3 latencies of both VEP and AEP. The P2 amplitudes of VEP and AEP of schizophrenics were decreased by 16% and 20% respectively as compared to the normal controls. CONCLUSION: The variations of VEP and AEP are a referential tool for diagnosing Alzheimer's disease and schizophrenia.