Abstract
Objective
The hypothalamus is one of the key structures involved in the pathophysiology of cluster headaches. This study aimed to analyze the volume of hypothalamic subunits and structural covariance networks in the hypothalamus of patients with cluster headache.
Methods
We retrospectively enrolled 18 patients with episodic cluster headache and 18 age- and sex-matched healthy controls. We calculated individual structural volumes in ten hypothalamic subunits using three-dimensional T1-weighted imaging and the FreeSurfer program, which conducted an automated segmentation based on deep convolutional neural networks. We also performed an analysis of the structural covariance network in the hypothalamus using graph theory and the BRAPH program. We compared the volumes of hypothalamic subunits and structural covariance networks in the hypothalamus of patients with cluster headache versus those of healthy controls.
Results
There were no significant differences in the structural volumes of the whole hypothalamus and hypothalamic subunits between patients with cluster headache and healthy controls. However, patients with cluster headache had significant alterations of the structural covariance network in the hypothalamus compared to that of healthy controls. The network measure of small-worldness index in patients with cluster headache was lower than that in healthy controls (0.844 vs. 0.955, p = 0.004).
Conclusion
We demonstrated a significant difference in the structural covariance network in the hypothalamus of patients with cluster headache versus those of healthy controls. These findings could be related to the pathogenesis of cluster headache.
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Availability of data and material
Data that support the findings of this study are available upon reasonable request.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by DAL, H-JL, HCK and KMP. The first draft of the manuscript was written by KMP and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Neither of the authors has any conflict of interest to disclose.
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This protocol was approved and carried out in accordance with the recommendation of the local Institutional Review Board (Haeundae Paik Hospital, Inje University College of Medicine, Busan, Korea).
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Lee, D.A., Lee, HJ., Kim, H.C. et al. Alterations of the structural covariance network in the hypothalamus of patients with cluster headache. J Neurol 269, 316–322 (2022). https://doi.org/10.1007/s00415-021-10629-z
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DOI: https://doi.org/10.1007/s00415-021-10629-z