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Differences in diffusion tensor imaging changes between narcolepsy with and without cataplexy.

F Irsel Tezer1, Abidin Erdal1, Sadiye Gumusyayla1

  • 1Hacettepe University, Faculty of Medicine, Department of Neurology, Ankara, Turkey.

Sleep Medicine
|October 16, 2018
PubMed
Summary
This summary is machine-generated.

This study reveals distinct white matter changes in narcolepsy patients with cataplexy, particularly in the midbrain-brainstem and temporal lobes. These findings help differentiate narcolepsy subtypes using diffusion tensor imaging (DTI).

Keywords:
CataplexyDTIMRINarcolepsyPolysomnographyWhite matter abnormalities

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Area of Science:

  • Neuroimaging
  • Neurology
  • Brain Science

Background:

  • Narcolepsy Type 1 is clinically defined by cataplexy, unlike Type 2.
  • Neuroimaging studies show brain abnormalities in narcolepsy, but results vary.
  • Differentiating narcolepsy subtypes via neuroimaging requires further investigation.

Purpose of the Study:

  • To identify specific white matter microstructural differences in narcolepsy with cataplexy (NC) versus narcolepsy without cataplexy (NOC).
  • To compare brain abnormalities in NC and NOC patients against healthy controls.
  • To evaluate the utility of diffusion tensor imaging (DTI) in characterizing narcolepsy subtypes.

Main Methods:

  • Diffusion tensor imaging (DTI) was performed on 11 NC patients, 12 NOC patients, and 16 healthy controls.
  • Tract-based spatial statistics (TBSS) were employed to analyze whole-brain white matter integrity.
  • Fractional anisotropy (FA) values were quantified to assess microstructural differences.

Main Results:

  • Both NC and NOC groups showed decreased FA in the cerebellum, thalami, corpus callosum, and left anterior-medial temporal white matter compared to controls.
  • NC patients exhibited additional FA decreases in the midbrain compared to controls.
  • No significant correlations were found between FA values and clinical or polysomnographic variables.

Conclusions:

  • Midbrain-brainstem white matter abnormalities are a distinctive DTI finding in narcolepsy patients with cataplexy.
  • Involvement of bilateral temporal lobes, especially the left, supports cataplexy association.
  • Observed DTI changes suggest potentially different pathological mechanisms underlying narcolepsy subtypes.