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Localizing deficits in white matter tracts of patients with narcolepsy with cataplexy: tract-specific statistical analysis

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Abstract

White matter alterations related to hypocretin pathway have been less evaluated in patients who have narcolepsy with cataplexy (NC), as compared to the identified exploration of gray matter and have varied among structural brain magnetic resonance imaging studies. The aim of this study was to investigate the disruption of specific white matter tracts in drug-naïve patients with NC, by using a tract-specific statistical analysis (TSSA). Forty drug-naïve NC patients with cataplexy and 42 heathy controls were enrolled in the study. All participants completed diffusion weighted imaging, polysomnography, and neuropsychological testing. At that time, we automatically identified fourteen major fiber tracts using diffusion tensor imaging techniques and analyzed the group comparison of fractional anisotropy (FA) values for each tract between the NC and controls, controlling for the participant’s age and gender. The mean age of the NC patients was 26.9 years and the onset age of daytime sleepiness and cataplexy was 16.7 years and 19.9 years, respectively. Relative to the controls, the NC patients showed that there were identified decreased FA values in the bilateral inferior fronto-occipital fasciculus (IFO). The Epworth sleepiness scale was positively correlated with FA values for the left IFO and right cingulate. The REM sleep latency was positively correlated with FA values for the left IFO, cingulate, and uncinate fasciculus in patients. This TSSA study revealed disintegration of the IFO in the NC patients and suggested that disintegration of WM tracts connected to the frontal cortex contributes to clinical manifestations of narcolepsy.

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Acknowledgements

This work was supported by Samsung Medical Center Grant (OTC1190671), by Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Science, ICT & Future Planning, Republic of Korea (2017R1A2B4003120), by Samsung Biomedical Research Institute grant (SMX1170571), by the National Research Foundation of Korea(NRF) grant funded by the Korea government(MSIP) (No.2016R1A2B4014398), and the National Research Council of Science & Technology (NST)grant by the Korea government (MSIT) (No. CAP-18-01-KIST).

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  1. Hea Ree Park and Hye Ryun Kim contributed equally to this work.

Authors and Affiliations

  1. Department of Neurology, Ilsan Paik Hospital, Inje University College of Medicine, Goyang, South Korea

    Hea Ree Park

  2. School of Biomedical Engineering, Korea University, 145, Anam-ro, Anam-dong 5-ga, Seongbuk-gu, Seoul, 02841, Republic of Korea

    Hye Ryun Kim

  3. Global Health Technology Research Center, College of Health Science, Korea University, Seoul, South Korea

    Hye Ryun Kim, Joon-Kyung Seong & Joon-Kyung Seong

  4. Department of Neurology, Neuroscience Center, Samsung Biomedical Research Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 06351, Republic of Korea

    Eun Yeon Joo

  5. Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, South Korea

    Eun Yeon Joo

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  1. Hea Ree Park
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Correspondence to Joon-Kyung Seong or Eun Yeon Joo.

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This was not an industry supported study. The authors have no commercial, financial, or otherrelationship related to the subject of this paper that could constitute or suggest a conflict ofinterest.

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Park, H.R., Kim, H.R., Seong, JK. et al. Localizing deficits in white matter tracts of patients with narcolepsy with cataplexy: tract-specific statistical analysis. Brain Imaging and Behavior 14, 1674–1681 (2020). https://doi.org/10.1007/s11682-019-00100-z

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