摘要
目的应用弥散张量成像(DTI)技术探讨脑白质疏松症(LA)患者脑白质微结构的改变与执行功能障碍的关系。方法对23例LA患者和19例健康对照进行蒙特利尔认知评估(MoCA)和4项执行功能测验包括Stroop色词干扰测验、连线测验(TMT)、数字符号测验(DST)、言语流畅性测验(VF),行DTI扫描,测量LA患者病灶区(WML)、LA患者正常表现白质区(NAWM)、对照组半卵圆中心、脑室前后部周围白质区的各向异性值(FA)、表观扩散系数(ADC)、平均扩散率(MD),并对LA组白质参数与认知功能进行相关性分析。结果LA患者存在明显的执行功能障碍,LA患者在Stroop色词干扰测验B、Stroop色词干扰测验C和Stroop色词干扰测验C—B、TMT—A和TMT—B、DST行为学成绩均较对照组相应测验值差[(69.4±13.4)和(43.3±5.0),t=8.03,P〈0.05]、[(141.4±42.1)和(65.4±10.3),t=7.66,P〈0.05]、[(72.0±41.4)和(22.1±9.6),t=5.13,P〈0.053、[(73.2±15.3)和(31.2±7.2),t=10.97,P〈0.05]、[(125.6±18.0)和(81.6±5.9),t=10.22,P〈0.05]和[(24.8±5.6)和(36.8±5.1),t=7.19,P〈0.053。WML在半卵圆中心、脑室前部和后部FA显著低于NAWM与对照组的相应区域的检验值[(0.2±0.1),(0.4±0.1)和(0.4±0.1),F=45.08,P〈0.05]、[(0.2±0.0),(0.4±0.1)和(0.4±0.1),F=70.11,P〈0.053和[(0.3±0.1),(0.4±0.1)和(0.4±0.1),F=8.54,P〈0.053;而WML在半卯圆中心、脑室前部和后部ADC显著高于NAWM和对照组的相应区域的检验值[(1.2±0.2),(O.8±0.1)和(0.8±0.1),F=46.77,P〈0.05]、[(1.2±0.3),(0.8±0.0)和(0.8±0.1),F=68.22,P〈0.05]和[(1.4±0.3),(0.8±0.0)和(0.9士0.1),F=17.08,P〈0.053;WML在半卵圆中心、脑室前部和后部MD显著高于NAWM和对照组的相应区域的检验值[(127.8±14.5),(95.3±26.4)和(100.8±9.4),F=19.72,P〈0.053、[(127.4±16.0),(101.8±13.9)和(93.4±5.6),F=39.26,P〈0.05]和[(134.4±21.2),(114.8±14.5)和(114.4±11.7),F=10.66,P〈0.05]。相关性分析得出LA患者脑室前角旁白质FA与Stroop C—B(r=0.46,P〈0.05)、TMT—A(r=0.48,P〈0.05)和TMT—B(r=0.46,P〈O.05)呈负相关,与DST测验呈正相关(r=0.42,P〈0.05)。结论DTI能够准确显示LA患者的特征性脑白质微结构的改变,且这种改变与执行功能密切相关。LA患者的执行功能障碍可能与前额叶一皮层下环路功能受损有关。
Objective To determine the relationship between characteristic damages in white matter and its executive dysfunction by magnetic resonance diffusion tensor imaging (DTI) in the patients with leukoaraiosis (LA). Methods A education-matched healthy people as control were total of 23 patients with LA and 19 age, sex and enrolled. Montreal cognitive assessment (MoCA), Stroop test, trail making test (TMT), digit-symbol test(DST), verbal fluence (VF) were applied to assess cognitive and executive functions. Fractional anisotropy (FA), apparent diffusion coefficient (ADC) and mean diffusivity (MD) in white matter lesion (WML) and normal-appearing white matter (NAWM) were measured in LA group, the bilateral centrum semiovale, anterior and posterior periventricular white matter in control group were measured by DTI. The white matter DTI parameters were compared between the groups, the relationship between DTI parameters and executive function was investigated in LA group. Results In LA patients, distinct executive dysfunction were found. The scores of Stroop B [(69. 4±13. 4) vs. (43.3±5.0), t=8.03, P〈 0.05)1, StroopC [(141.4±42.1) vs. (65.4±10.3), t=7.66, P〈0.05)]andStroopC-B[ (72.0± 41.4) vs. (22.1±9.6), t=5.13, P〈0.05) 1, TMT-A [(73. 2±15. 3) vs. (31.2±7.2), t=10.97, P〈0.05) ], TMT-B [(125.6±18.0) vs. (81.6±5.9), t=10.22, P〈0.05) ] andDST[ (24.8±5.6 )vs. (36.8±5.1), t=7.19, P〈0.05) ] were inferior in LA group to control group. The values of FA in centrum semiovale [(0. 2±0.1) vs. (0.4±0.1) and (0.4±0.1), F=45.08, P〈0.05)], anterior periventricular white matter [ (0.2 ± 0.0) vs. (0.4 ± 0.1 ) and ( 0.4 ± 0.1 ), F = 70.11, P〈 0.05)1 and posterior periventricular white matter[ (0.3±0. 1) vs. (0.4±0.1) and (0.4±0.1), F= 8.54, P〈0.05) ]of WML were reduced as compared with those of NAWM and control group. The values of ADC(×10-3mm2/s) in the above three regions of WML [(1. 2±0. 2) vs. (0.8±0.1) and (0.8±0.1), F=46.77, P〈0.05)3, [(1.2±0.3) vs. (0.8±0.0) and (0.8±0.1), F=68.22, P〈 0.05)land [(1.4±0.3) vs. (0.8±0.0) and (0.9±0.1), F=17.08, P〈0.05) ] were elevated, as compared with those of NAWM and control group, and the values of MD (× 10-5 mm2/s) in the three regions of WML[ (127.8± 14.5) vs. (95.3±26.4) and (100.8±9.4), F=19.72, P〈0.05) 1, ((127.4±16.0) vs. (101.8±13.9) and (93.4±5.6), F=39.26, P〈0.05) ] and [ (134.4±21.2) vs. (114.8±14. 5) and (114.4 ±11.7), F= 10. 66, P〈0. 05) ] were also increased, as compared with those of NAWM and control group. There was negative correlation of FA with Stroop C-B (r= -0.46, P〈0.05),TMT-A (r=-0.48, P〈0.05) and TMT-B (r=-0.46, P〈0.05), while FA was positively related with DST test (r= 0.42, P〈0.05) in anterior periventricular white matter. Conclusions DTI can detect the characteristic damages of white matter, which is strongly related with executive function impairments possibly induced by the damage of prefrontal-subcortical loop in the patients with LA.
出处
《中华老年医学杂志》
CAS
CSCD
北大核心
2012年第3期200-204,共5页
Chinese Journal of Geriatrics
基金
北京市卫生系统高层次卫生技术人才资助项目(2009-3-09)
关键词
脑白质疏松症
认知
磁共振成像
弥散
Leukoaraiosis
Cognition
Diffusion magnetic resonance imaging