FOLLOW-UP STUDY ON AUDITORY EVOKED POTENTIAL P50 IN FIRST-EPISODE SCHIZOPHRENIA

Objective To investigate the variation of auditory evoked potential P50 in first-episode schizo- phrenia. Methods P50 was recorded from 66 schizophrenics and 92 normal controls with American Brova instrument, and assessing their psychotic symptoms with PANSS. Results Compared with NC, schizophrenics showed sensory gating deficit, reflecting by increased S2/S1 ratio (NC: 42±21% , Sch:81±40% ,P <0. 01). No significant correlation was found between PANSS score and the three markers for assessing the sensory gating, such as the S2/S1 ratio, S2-S1, and 100 (1 -S2/S1) (P > 0. 05). Schizophrenics showed no differences with P50 markers between the 5 weeks and 12 weeks of treatment. Conclusion P50 might be biological trait marker of schizophrenia.

托烷司琼对精神分裂症患者听感觉门控P50的影响

目的:探讨托烷司琼对精神分裂症患者听感觉门控P50的影响。方法:服用利培酮的精神分裂症患者(40例)随机分为安慰剂组、小、中、高剂量(托烷司琼5、10、20 mg/d)组,采用配对听觉条件刺激(S1)、测试刺激(S2)范式,观察不同剂量托烷司琼对精神分裂症患者听感觉门控P50的影响,用副反应量表评估用药安全性。结果:①安慰剂组在用药前、后P50抑制差别无统计学意义,小、中剂量组在用药后第1、10 d能明显改善P50抑制,高剂量组在用药第10 d后能明显改善P50抑制,且剂量组间差别有统计学意义(P<0.01),中剂量组优于小剂量组,小剂量组优于高剂量组。②小、中剂量组不良反应轻微,高剂量组有不良反应。结论:托烷司琼能明显改善精神分裂症患者听感觉门控P50,对精神分裂症的神经认知缺陷可能有潜在的治疗作用,且以中剂量为佳。

首发精神分裂症听感觉门控P50、P300及认知功能的对照研究

目的:探讨首发精神分裂症患者听感觉门控P50、P300与威斯康星卡片分类测验之间的对比性。方法:采用配对听觉条件、测试刺激范式及威斯康星卡片分类测验对60名首发精神分裂症患者和60名健康常人进行检测,并进行对比分析。结果:患者组听感觉门控P50抑制、明显高于对照组(P<0.01),P300明显低于于对照组(P<0.01);威斯康星卡片分类测验结果显示,患者组完成分类数和正确分类数显著低于对照组,错误数和持续错误数显著高于对照组(P<0.01);患者组听感觉门控P50抑制、P300与威斯康星卡片分类测验指标间无对比性。结论:首发精神分裂症患者存在认知功能损害与额叶功能缺陷,反映出可能存在不同的神经发生机制。

P50 auditory sensory gating in first onset schizophrenics and normal healthy adults

The aim of this research was to investigate the variations of P50 auditory sensory gating(P50)in normal healthy adults and the first onset schizophrenics.By using the American Nicolet Bravo electromyography/evoked potential(EMG/EP)system,P50 was measured with conditioning-testing paradigm(paired-click stimuli S1 and S2 were used)in 58 first onset schizophrenics and 108 healthy adults,and the Positive and Negative Syndrome Scale(PANSS)was applied.The following three conclusions have been reached.(1)In normal control(NC)group,measured from central,anterior and posterior zone(Cz,Fz and Pz respectively),there were no statistical differences(P>0.05)between S1 and S2 evoked P50 peak latencies(S1-P50 and S2-P50);the ampli-tudes of S2-P50[(2.2P1.4),(2.3P1.5)and(2.1P1.4)μV respectively]reduced significantly as compared with S1-P50[(5.6P3.3),(5.6P3.9)and(4.9P2.8)μV respectively](P<0.01);the S2/S1 ration,S1-S2 difference,and 100(1-S2/S1)had no statistical differences(P>0.05).(2)Compared with NC,the schizophrenic group significantly showed lower S1-P50 amplitudes(P<0.01,except at Pz in whichZ=2.030,P=0.042),higher S2-P50 amplitudes,higher S2/S1 ratio,lower S1-S2 difference,and more decreased 100(1-S2/S1)(P<0.01)at Cz,Fz and Pz.(3)No significant correlations were found among S2/S1 ratio,S1-S2,100(1-S2/S1)of sen-sory gating and PANSS(P>0.05)in schizophrenic group.The first onset schizophrenics had sensory gating deficits,which could be quantified by P50.

电针“神门”“太渊”穴对急性心肌缺血家兔听感觉门控电位P50的影响

目的:探讨电针对急性心肌缺血家兔大脑皮层感觉门控的影响,以及不同经穴作用的相对特异性。方法:随机选择10只家兔作为正常组,余家兔冠状动脉结扎法复制急性心肌缺血模型。将模型复制成功的家兔随机分为模型组、神门组、太渊组,每组10只。各电针组分别电针"神门""太渊"穴,刺激电流为1mA,频率为2Hz,刺激15min。采用BIOPAC生物信号采集系统观察各组家兔心率,利用美国NEUROSCAN ERPs工作站,记录各组家兔大脑皮层听感觉门控电位P 50变化情况。结果:与正常组比较,模型组心率下降(P<0.01),S 2-P 50波幅增大(P<0.01),S 2/S 1增大(P<0.01),S 1-S 2以及100×(1-S 2/S 1)减小(均P<0.01);与模型组比较,神门组家兔心率加快,S 2-P 50波幅减小(均P<0.01),S 2/S 1减小(P<0.01),S 1-S 2以及100×(1-S 2/S 1)增大(均P<0.01)。太渊组以上各指标均无明显改善,与神门组的差异均具有统计学意义(P<0.01)。结论:电针不同经穴对急性心肌缺血家兔大脑皮层感觉门控能力的调整作用具有相对特异性,电针心经原穴"神门"的调整作用优于电针肺经原穴"太渊"。