Disrupted functional connectivity in the hippocampal subregions of patients with migraine without aura: a functional study on mechanisms underlying migraine chronification
Abstract
Background: Despite increasing evidence indicating hippocampal dysfunction in migraineurs, they overlooked the functional differences among hippocampal subregions and mostly used static functional connectivity (sFC). This study aimed to combine sFC and dynamic functional connectivity (dFC) to investigate the role of hippocampal subregional functional changes in migraine chronification.
Methods: Resting-state functional MRI scans were performed on 52 patients with episodic migraine (EM), 22 patients with chronic migraine (CM), and 67 healthy controls (HCs). The bilateral rostral hippocampus (rHipp) and caudal hippocampus were selected as regions of interest. Differences in sFC and dFC values between the hippocampal subregions and other brain regions among the three groups were compared through the analysis of the general linear model. Spearman partial correlation analyses were used to assess the relationship between FC and clinical parameters in the migraine cohort.
Results: In the sFC analysis, both EMs and CMs showed reduced connectivity between the left rHipp and the left orbital part of medial frontal gyrus as compared with HCs. In the dFC analysis, both the CM and EM groups exhibited increased connectivity between the right rHipp and the right calcarine compared to HCs, and the CM group demonstrated decreased dFC between the aforementioned brain regions relative to the EM group. No significant correlations were found between sFC and dFC values and clinical…
How strong is the evidence?
Evidence Hub reads this as a cohort study, done in people. Its evidence level is 3 of 5 (Moderate · trial / cohort / secondary analysis). Trials without a large randomized design, cohorts and secondary analyses give moderate evidence. Reported size: 52 participants or records.
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