首发抑郁症静息态脑功能低频振幅研究

摘要

Objective: We used the method of resting-state functional magnetic resonance imaging (rfMRI) to explore the abnormal brain activity under the basic statusofpatientswithfirst-episode depression and its significance.Materials and Methods: Thirty patients with depression(the DSM-IV diagnostic criteria for depression) and thirty healthy volunteers matched with it were examined using resting-state functional MRI. Data analysis was processed by using the method of low-frequency amplitude (ALFF). Results:Intergroup analysis between depression and normal ALFF group:ALFF values of the parts of bilateral frontal lobes, temporal lobe and the cingulate gyrus and the right angular gyrus in depression groups are significantly higher than those in the control group; and ALFF values of bilateral medial prefrontal cortex, cuneus, precuneus, cerebellar hemisphere decreased. Conclusion:ALFF technology which can directly reflect the change of BOLD signal caused by abnormal metabolism of depressions with emotion disorder would contribute to exploration of the pathophysiological mechanisms of depression.%目的：采用静息态功能磁共振成像(resting-state functional magnetic resonance imaging, rfMRI)研究方法，探讨首发抑郁症患者基础状态下异常脑活动区及其意义。材料与方法对30例抑郁症患者(符合DSM-IV抑郁症的诊断标准)和与之匹配的30例健康志愿者进行静息态脑功能扫描。运用低频振幅(amplitude of low frequence fluctuation, ALFF)方法对数据分析，并采用双样本检验方法进行组间对比处理。结果抑郁症组与正常对照组ALFF图组间分析：抑郁症组大脑的双侧部分额叶、颞叶、扣带回及右侧角回等区域ALFF值显著高于正常对照组；而在双侧内侧前额叶、楔叶、楔前叶、小脑半球的ALFF值显著减低。结论ALFF技术可以直接反映抑郁症患者情绪异常引起的血氧水平依赖(blood oxygen level dependent, BOLD)信号代谢的改变，有助于抑郁症病理生理机制的探索。