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Altered Brain Function in First-Episode and Recurrent Depression: A Resting-State Functional Magnetic Resonance
Jifei Sun1,2, Limei Chen1,2, Jiakai He2,3
1Guang'anmen Hospital, China Academy of Chinese Medical Sciences, Beijing, China.
Frontiers in Neuroscience
|May 13, 2022
Summary
Recurrent depressive episodes (RDE) show more widespread and complex brain function abnormalities than first depressive episodes (FDE). These differences in regional homogeneity (ReHo) and amplitude of low-frequency fluctuations (ALFF) correlate with symptom severity.
Area of Science:
- Neuroscience
- Psychiatry
- Medical Imaging
Background:
- Distinguishing brain activity between first depressive episodes (FDE) and recurrent depressive episodes (RDE) is crucial but understudied.
- Regional homogeneity (ReHo) and amplitude of low-frequency fluctuations (ALFF) are key indicators of abnormal brain function.
- Investigating these differences can elucidate the neuropathological mechanisms underlying depression recurrence.
Purpose of the Study:
- To compare brain function activity, using ReHo and ALFF, between patients with FDE and RDE.
- To identify specific brain regions exhibiting differential activity between FDE and RDE.
- To explore the relationship between altered brain function in these regions and the severity of depressive symptoms.
Main Methods:
- Resting-state functional magnetic resonance imaging (fMRI) was performed on 29 RDE patients, 28 FDE patients, and 29 healthy controls (HCs).
- Image analysis focused on ReHo and ALFF measurements to assess brain function.
- Statistical analyses, including ANOVA and Pearson correlation, were used to compare groups and correlate brain activity with clinical symptoms.
Main Results:
- Significant differences in ReHo and ALFF were observed across frontal, parietal, temporal, and occipital lobes among the three groups.
- The RDE group exhibited distinct patterns of higher ReHo and ALFF in several frontal regions compared to the FDE group.
- Both FDE and RDE groups showed lower ReHo and ALFF in the left angular gyrus compared to HCs, with correlations to symptom severity.
Conclusions:
- While both FDE and RDE groups share some abnormal brain activity regions, RDE demonstrates more extensive and complex functional alterations.
- The right inferior frontal triangular gyrus is particularly implicated in the heightened neuropathological mechanisms of RDE.
- These findings highlight the evolving nature of brain dysfunction in recurrent depression and its link to clinical presentation.
