Journal Article

Mammillothalamic functional connectivity and memory function in Wernicke's encephalopathy

Eosu Kim, Jeonghun Ku, Kee Namkoong, Wonho Lee, Kang Soo Lee, Ji-Yeon Park, Su Young Lee, Jae-Jin Kim, Sun I. Kim and Young-Chul Jung

in Brain

Published on behalf of The Guarantors of Brain

Volume 132, issue 2, pages 369-376
Published in print February 2009 | ISSN: 0006-8950
Published online November 2008 | e-ISSN: 1460-2156 | DOI: http://dx.doi.org/10.1093/brain/awn311
Mammillothalamic functional connectivity and memory function in Wernicke's encephalopathy

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There is still debate over the neural mechanisms underlying pathogenic and even recovery processes of Wernicke's encephalopathy. Therefore, we attempted to validate the usefulness of resting-state functional connectivity analysis in assessing memory function and its neural correlation with the mammillothalamic tract in patients recovering from Wernicke's encephalopathy. Seven chronic alcoholics recovering from Wernicke's encephalopathy, 14 alcoholic comparisons without Wernicke's encephalopathy, and 14 healthy comparisons underwent functional connectivity MRI scans, as well as verbal and non-verbal memory tests after at least a 1 month abstinence from alcohol. Resting-state functional connectivity strength between the anterior thalamus and the mammillary bodies was investigated by calculating temporal correlations in magnetic resonance signal levels between the two regions during a 5-min passive viewing task. The mean values of the functional connectivity strength between the left anterior thalamus and the ipsilateral mammillary body differed significantly between Wernicke's encephalopathy patients and healthy comparisons (P = 0.014). This connectivity strength in alcoholic comparisons fell between those of the former two groups, with a significant difference from that of healthy comparisons (P = 0.038). In addition, the strength of this left-sided functional connectivity significantly correlated with delayed verbal recall scores (r = 0.771, P = 0.042) and verbal recognition score (r = 0.825, P = 0.022) in patients with Wernicke's encephalopathy. Our findings indicate that memory function in patients recovering from Wernicke's encephalopathy parallels the level of the mammillothalamic functional connectivity; this supports the usefulness of resting-state functional connectivity analysis as a practical alternative to pathological examination of the mammillothalamic tract in living patients with Wernicke's encephalopathy.

Keywords: Wernicke's encephalopathy; memory; mammillothalamic tract; resting-state functional connectivity

Journal Article.  4547 words.  Illustrated.

Subjects: Neurology ; Neuroscience

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