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Larger hypothalamic volume in narcolepsy type 1.

Hilde T Juvodden1, Dag Alnæs2,3, Martina J Lund2,4

  • 1Department of Rare Disorders, Norwegian Centre of Expertise for Neurodevelopmental Disorders and Hypersomnias (NevSom), Oslo University Hospital, Ullevål, Oslo, Norway.

Sleep
|July 18, 2023
PubMed
Summary
This summary is machine-generated.

Patients with narcolepsy type 1 (NT1) have larger hypothalamic volumes, particularly in specific subregions. This finding in narcolepsy type 1 (NT1) may indicate neuroinflammation and cellular changes.

Keywords:
MRIT1hypothalamusnarcolepsy

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Area of Science:

  • Neurology
  • Neuroimaging
  • Sleep Medicine

Background:

  • Narcolepsy type 1 (NT1) is a neurological sleep disorder characterized by significant loss of hypocretin-producing neurons and increased histaminergic neurons in the hypothalamus.
  • Previous postmortem studies suggest alterations in hypothalamic cell populations and gliosis in NT1 patients, but in vivo data are limited.

Purpose of the Study:

  • To compare in vivo MRI-based volumes of the hypothalamus and its subregions between patients with narcolepsy type 1 (NT1) and healthy controls.

Main Methods:

  • Utilized a deep learning-based segmentation tool (Freesurfer) to measure whole hypothalamus, left/right hypothalamus, and 10 hypothalamic subregion volumes.
  • Included 54 post-H1N1 NT1 patients and 114 controls, analyzing group differences using general linear models with permutation testing and Bonferroni correction.

Main Results:

  • Patients with NT1 exhibited significantly larger volumes for the whole hypothalamus, left and right hypothalamus, and specifically the left and right tubular-inferior hypothalamic subregions compared to controls.
  • Statistical significance was confirmed through permutation testing (p < 0.05) with effect sizes (Cohen's d) ranging from 0.65 to 0.72.

Conclusions:

  • The study demonstrates significantly enlarged hypothalamic volume in patients with post-H1N1 NT1 compared to controls, particularly in tubular-inferior subregions.
  • These volumetric increases may reflect underlying neuroinflammatory processes, gliosis, and alterations in neuronal populations previously suggested in NT1.