女性抑郁症首次发病患者认知事件相关电位P300与脑灰质体积的相关分析

摘要

Objective The present study aims to explore the grey matter volume changes in drugnaive first-episode major depressive disorder (MDD) female patients and to find out their correlation with event-related potential P3oo.Methods Twenty-five patients,aging between 18-58 years,diagnosed with first-episode MDD and 28 gender-,age-,education level-matched healthy controls were included in this study.All participants were assigned to receive 3D structural magnetic resonance imaging brain scans,and the patients were assigned to receive P30o tests.Results In contrast with healthy controls,decreased grey matter volume was detected in the right frontal operculum and the right precentral gyrus of patients,both P3 and N2 latencies were positively correlated with bilateral putamen nuclei (all P ＜ 0.01).The P3 latency was also positively associated with the volumes of left middle temporal gyrus,left middle frontal gyrus,and leftfusiform gyrus.The N2 latency was also positively associated with the volumes of left posterior cingulate gyrus,the right fusiform gyrus,the occipital lobe,and the left cerebellum (all P ＜ 0.01).The P3 amplitude was negatively associated with the volumes of left angular gyrus and right superior frontal gyrus (all P ＜0.01).No statistically significant correlation was found between each component of P300 and Hamilton Depression Scale scores (total and factor).Conclusions The abnormalities of grey matter volume are observed in certain brain regions in unmedicated female patients with first-episode MDD in this study.And the P300 in those patients are in correlation with many grey matter regions of the brain,especially temporal lobes and basal ganglia.%目的 探讨首次发病未服药女性抑郁症患者脑灰质体积变化特点,以及与认知事件相关电位P300的相关分析.方法 对25例18 ～58岁首次发病未服药女性抑郁症患者(患者组)和28名健康对照者(对照组)行头部3D结构MRI扫描,并对患者组进行P300检查.结果 患者组较对照组右侧额下回岛盖部、右侧中央前回灰质体积减小.患者组中P3、N2潜伏期均与双侧壳核、右侧颞中回体积呈正相关(均P ＜0.01);P3潜伏期与左侧颞中回、左侧额中回、左侧梭状回体积呈正相关(均P＜0.01),而P3波幅与左侧角回、右侧额上回体积呈负相关(均P＜0.01);N2潜伏期与左侧后扣带回、右侧梭状回、枕叶、左侧小脑体积呈正相关(均P＜0.01);患者组P300潜伏期和波幅与汉密尔顿抑郁量表的总分和各因子分无相关性.结论 首次发病未服药女性抑郁症患者存在特征性脑灰质体积异常,其P300可能与多个脑灰质区域相关,尤其与颞叶、基底神经节的关系最明显.