抑郁症患者治疗前后海马神经可塑性改变的弥散张量成像研究

目的 探讨经过有效的抗抑郁治疗后,抑郁症患者海马神经纤维的可塑性变化情况,及是否可被弥散张量成像技术(DTI)检测.方法 筛选中青年重性抑郁症患者以及性别、年龄及教育年限相匹配的20例健康对照者参加本研究.入组时均经常规MRI及DTI扫描.联合运用基于像素的全脑分析法(VBA)及感兴趣区(ROIs)方法对影像学数据进行分析.结果 VBA分析显示治疗后患者组在双侧边缘叶扣带回及额下回的FA值较健康对照组仍降低,但较疗前右额下回、左边缘叶扣带回及右枕叶下回的区域FA值有明显增高,组间未发现海马区域的神经纤维改变(P<0.01,像素集合阈值>20).ROIs分析未发现治疗前后组间以及患者对照组间有海马FA相对值的显著性差异(P>0.05).结论 有效的抗抑郁治疗可以明显改善额叶及扣带回区域的神经纤维的损害状况,但未发现海马神经纤维在抗抑郁治疗中发生变化.

Treatment response of hippocampal neural plasticity in depression:a diffusion tensor imaging study

Objective To examine the white matter micro structural changes of hippocampus in the mid-die-aged major depression, and hypothesis that the hippocampal neurogenesis during the effective antidepressants can be found by diffusion tensor imaging(DTI) technology. Methods Middle-aged patients with major depression were enrolled, twenty patients received open but controlled with SSRIs for 10 weeks,twenty age, gender, education-matched healthy controls were involved as control group. All the subjects were scanned by DTI,using both whole-brain,voxel-based analysis(VBA) and Regions of interests (ROIs) methods to analyze the data. Results The VBA analysis found the post treatment patients made significant improvement in the fight inferior frontal lobe, left cingulate gyms of iimbic lobe and the right sub-gyral of occipital,but no significant difference in the hippocampus were found between any groups (all P<0.01, cluster>20). For the hippocampal relative FA of ROIs analysis,there were no significant difference between the patients before and after treatment, even no difference between the prior-treatment patients and healthy control,the remitted patients and the healthy controls(P<0.05). Conclusions Micro structural white matter changes in the frontal gyms, temporal and cingulated gyms are associated with mid-die-aged depression,no changes were found in the hippocampus. These findings do not support the hypothesis that the hippocampal neurogenesis can be found by DTI technology.