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Non-invasive measurement of vagus activity in the brainstem – a methodological progress towards earlier diagnosis of dementias?

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Summary.

In Alzheimer’s disease (AD), mild functional disturbances should precede gross structural damage and even more clinical symptoms, possibly by decades. Moreover, alterations in the brainstem are supposed to occur earlier as cortical affections. Based on these considerations, we developed a new method aiming at the measurement of vagal brainstem functioning by means of evoked potentials after electrical stimulation of the cutaneous representation of the vagus nerve in the external auditory channel. In the current study, a first sample of patients with Alzheimer’s disease (n = 7) and mild cognitive impairment (n = 3) were investigated (6m, 4f, range from 57 to 78 y, mean age 68.6 years). Vagus somatosensory evoked potentials (VSEP) were characterized by significantly longer latencies as compared to healthy age- and gender-matched controls (p < 0.05). Future large scale studies – also including preclinical stages of AD – have to assess the value of this non-invasive, fast and cheap method in the early diagnosis of neurodegenerative disorders.

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  1. Laboratory for Psychophysiology and Functional Imaging, Department of Psychiatry and Psychotherapy, Julius-Maximilians-University, Würzburg, Germany

    T. Polak, A.-C. Ehlis, J. B. M. Langer, M. M. Plichta, F. Metzger, T. M. Ringel & A. J. Fallgatter

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  1. T. Polak
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  2. A.-C. Ehlis
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  3. J. B. M. Langer
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  4. M. M. Plichta
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  5. F. Metzger
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  6. T. M. Ringel
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  7. A. J. Fallgatter
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Polak, T., Ehlis, AC., Langer, J. et al. Non-invasive measurement of vagus activity in the brainstem – a methodological progress towards earlier diagnosis of dementias?. J Neural Transm 114, 613–619 (2007). https://doi.org/10.1007/s00702-007-0625-8

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  • DOI: https://doi.org/10.1007/s00702-007-0625-8

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