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Correlation of midbrain diameter and gait disturbance in patients with idiopathic normal pressure hydrocephalus

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Abstract

Background and purpose

Although gait disturbance is an important feature of idiopathic normal pressure hydrocephalus (NPH), only tentative theories have been offered to explain its pathophysiology. It has been suggested that the mesencephalic locomotor region is the anatomical substrate for the development of the hypokinetic NPH gait. To investigate this possibility, we evaluated the correlation between gait disturbance and midbrain diameter.

Methods

We enrolled 21 patients with NPH and 20 age–matched control subjects for the study. The maximal diameter of the midbrain and pons, and the width of the lateral and third ventricles were measured using midsagittal T1–weighted MRI and axial T2–weighted MRI, respectively. Gait disturbance, cognitive dysfunction, and incontinence were semiquantified.

Results

The maximal midbrain diameter was significantly smaller in the NPH group than in the controls (14.8 ± 0.9 vs. 17.1 ± 0.7mm, p < 0.001). There were inverse correlations between the midbrain diameter and the widths of the two ventricles (r = –0.562, p = 0.008 for the third ventricle, and r = –0.510, p = 0.018 for the lateral ventricle). The severity of gait disturbance was negatively correlated with the midbrain diameter (r = –0.598, p = 0.004), but the degree of cognitive dysfunction and incontinence showed no significant correlation with midbrain diameter or ventricular width.

Conclusions

This study suggests that midbrain atrophy is significantly associated with gait disturbance in NPH.

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Authors and Affiliations

  1. Dept. of Neurology, College of Medicine Ajou University, Woncheon-dong San 5, Paldal-ku Suwon, Kyungki-do, 442–749, South Korea

    P. H. Lee M.D., Ph.D., S. W. Yong M.D. & K. Huh M.D.

  2. Dept. of Neurosurgery, Ajou University School of Medicine, Suwon, Korea

    Y. H. Ahn M.D., Ph.D.

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  1. P. H. Lee M.D., Ph.D.
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  2. S. W. Yong M.D.
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  3. Y. H. Ahn M.D., Ph.D.
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  4. K. Huh M.D.
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Correspondence to P. H. Lee M.D., Ph.D..

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Lee, P.H., Yong, S.W., Ahn, Y.H. et al. Correlation of midbrain diameter and gait disturbance in patients with idiopathic normal pressure hydrocephalus. J Neurol 252, 958–963 (2005). https://doi.org/10.1007/s00415-005-0791-2

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  • DOI: https://doi.org/10.1007/s00415-005-0791-2

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