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The medial vestibular nuclei, a vulnerable target in thiamine deficiency

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Abstract

Background

Bilateral medial vestibular nuclei (MVN) is a common target in thiamine depletion and results in acute vestibular failure. Involvement of the MVN was present in 27 out of 38 brainstem sections reported in the largest thiamine deficiency autopsy cohort with Wernicke’s encephalopathy.

Method

Serial clinical, imaging and vestibulo-ocular reflex gain measured with the video head impulse (vHIT) in one patient with acute thiamine deficiency.

Results

Low horizontal VOR gain correlated with an abnormal manual head impulse and with MRI evidence of MVN in an alcohol-dependent patient with low thiamine levels. The vertical VOR gain was either normal or mildly abnormal. Thiamine replacement and normal diet restored the VOR gain and MRI signal changes to normal.

Conclusion

This single case study provides clinical-imaging correlation for symmetric MVN compromise in thiamine deficiency, its effect on the VOR gain and the favorable response to thiamine and diet replacement when identified early.

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Acknowledgements

The authors would like to thank Professor David S Zee, M.D. from The Johns Hopkins University. Department of Neurology for his critical review of the manuscript.

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Correspondence to Jorge C. Kattah.

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The authors declare that they have no competing interests.

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415_2017_8670_MOESM1_ESM.tif

Supplemental Figure 2. Video head Impulse recording on presentation. The top left panel shows horizontally decreased gain: Left (blue) > than right (red). The arrow points to an overt corrective rightward saccade in response to a hypoactive left head impulse. The vertical canal gain showed mildly decreased right posterior and normal left anterior canal gain (LARP: Left middle panel). The right anterior, left posterior canals was normal (RALP: Left lower panel). (TIFF 1272 kb)

415_2017_8670_MOESM2_ESM.tif

Supplemental Figure 3 Axial FLAIR MRI of the brain shows increased signal in the MVN, periaqueductal gray, medial thalamus and corpus callosum (panels A-E). Restricted diffusion was noted in the CC (Panels FG) and adjusted coefficient map (panel H). (TIFF 2579 kb)

415_2017_8670_MOESM3_ESM.tif

Supplemental Figure 4 Axial DWI MRI and Adjusted Coefficient Map (ADC). There is restricted DWI signal in the Splenium of the Corpus Callosum (left image) with true restriction diffusion verified with the ADC map (TIFF 270 kb)

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Kattah, J.C., Guede, C. & Hassanzadeh, B. The medial vestibular nuclei, a vulnerable target in thiamine deficiency. J Neurol 265, 213–215 (2018). https://doi.org/10.1007/s00415-017-8670-1

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  • DOI: https://doi.org/10.1007/s00415-017-8670-1

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