反复发作抑郁症患者前扣带回额叶执行功能的磁源性影像研究

目的 观察反复发作抑郁症患者前扣带回、额叶执行功能在时间空间序列的变化特征.方法 18例反复发作抑郁症患者及21名年龄、性别、受教育年匹配的健康对照入组,利用脑磁图检测受试者在完成Stroop字色干扰测试时前扣带回、额叶功能的实时改变.结果 1.与对照组相比,患者组完成Stroop字色干扰测试时激活增强的脑区依次为(t代表激活强度):(1)100～ 200ms:右前扣带回(t=1.81)、双侧额内侧同(t=l.91,t=1.86)、左额上回(t=1.79)、右额中回(t=1.82)、右额下回(t=1.82)(2)200～300ms:左前扣带回(t=1.82)；(3)250 ～350 m:左前扣带同(t=2.67)、左额内侧同(t=2.43)、左额下回(t=1.91)；(4)300～400ms:左前扣带回(t=2.26)、双侧额下回(t=1.97,t=2.66)、左额内侧回(t=2.35)；(5)350 ～450ms:左前扣带回(t=2.02)、左额内侧回(t=2.00)、双侧额下回(t=1.74,t=1.78)；(6)400 ～ 500 ms:左前扣带回(t=2.01)、左额内侧回(t=1.97)；2.与对照组相比,患者组完成Stroop字色干扰测试时激活减弱的脑区为:200～300 ms左额中回(t=1.79)、左额上回(t=1.76).结论 反复发作抑郁症患者前扣带回、额叶脑区存在时间和空间序列双层次的激活紊乱.

The fronto-cingulate executive function in recurrent depression revealed by the magnetic source imaging

Objective To investigate the variation of executive function of fronto-cingulate cortex in spatio-temporal sequence in recurrent depressed patients.Methods Eighteen recurrent depressed patients and twenty-one age-,gender- and education- matched healthy controls were involved in the Stroop word-color interference test to detect the executive function of anterior cingulate and prefrontal regions by magnetoencephaloraphy scanning.Results 1.Compared to healthy controls,the increased activation of brain regions in depressed patients during different time periods were separately shown as follows( t represents activation strength):( 1 ) 100 ～ 200 ms:the right anterior cingulate gyrus ( t =1.81,T value means activation strength),the bilateral medial frontal gyrus ( t =1.91,t =1.86),the left superior frontal gyms( t =1.79 ),the right middle frontal gyrus( t =1.82 ),the right inferior frontal gyrus ( t =1.82 ).( 2 ) 200 ～ 300 ms:the left anterior cingulate gyrus ( t =1.82 ).( 3 ) 250 ～ 350 ms:the left anterior cingulate gyrus ( t =2.67 ),the left medial frontal gyrus ( t =2.43 ),the left inferior frontal gyrus ( t=1.91 ).(4)300 ～400ms:the left anterior frontal gyrus(t=2.26),the bilateral inferior gyrus( t=1.97,t=2.66),the left medial frontal gyrus(t=2.35).(5)350 ～450ms:the left anterior cingulate gyrus(t=2.02),the left medial frontal gyrus ( t =2.00),the bilateral inferior frontal gyrus ( t =1.74,t =1.78 ).( 6 ) 400 ～ 500 ms:the left anterior cingulate gyrus( t=2.01 ),the left medial frontal gyrus( t =1.97).2.Compared to healthy controls,patients showed decreased activation in the left middle frontal gyms ( t =1.79) and the left superior gyrus(t =1.76) in 200 ～ 300 ms.Conclusion Executive dysfunction is reflected in depressed patients with the activation inefficiency in anterior cingulate and prefrontal regions in spatio-temporal sequence.