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Selected Publication:
SHR Neuro Cancer Cardio Lipid Metab Microb
Golaszewski, S; Langthaler, PB; Schwenker, K; Florea, C; Christova, M; Brigo, F; Trinka, E; Nardone, R.
Abnormal cortical synaptic plasticity in minimal hepatic encephalopathy.
Brain Res Bull. 2016; 125(8):200-204
Doi: 10.1016/j.brainresbull.2016.07.011
Web of Science
PubMed
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- Co-authors Med Uni Graz
- Christova Monica
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- Abstract:
- Minimal hepatic encephalopathy (MHE) represents the earliest stage of hepatic encephalopathy (HE). MHE is characterized by cognitive function impairment in the domains of attention, vigilance and integrative function, while obvious clinical manifestations are lacking. In the present study, we aimed at assessing whether subjects with MHE showed alterations in synaptic plasticity within the motor cortex. Previous findings suggest that learning in human motor cortex occurs through long-term potentiation (LTP)-like mechanisms. We employed therefore the paired associative stimulation (PAS) protocol by transcranial magnetic stimulation (TMS), which is able to induce LTP-like effects in the motor cortex of normal subjects. Fifteen patients with MHE and 15 age- and sex-matched cirrhotic patients without MHE were recruited. PAS consisted of 180 electrical stimuli of the right median nerve paired with a single TMS over the hotspot of right abductor pollicis brevis (APB) at an ISI of 25ms (PAS25). We measured motor evoked potentials (MEPs) before and after each intervention for up to 30min. In healthy subjects the PAS25 protocol was followed by a significant increase of the MEP amplitude. On the contrary, in patients with MHE the MEP amplitude was slightly reduced after PAS. These findings demonstrated that associative sensorimotor plasticity, an indirect probe for motor learning, is impaired in MHE patients. Copyright © 2016 Elsevier Inc. All rights reserved.
- Find related publications in this database (using NLM MeSH Indexing)
- Analysis of Variance -
- Electric Stimulation -
- Electromyography -
- Female -
- Hepatic Encephalopathy - pathology
- Humans -
- Long-Term Potentiation - physiology
- Male -
- Median Nerve - physiopathology
- Middle Aged -
- Motor Cortex - physiopathology
- Neuropsychological Tests -
- Time Factors -
- Transcranial Magnetic Stimulation -
- Find related publications in this database (Keywords)
- Minimal hepatic encephalopathy
- Transcranial magnetic stimulation
- Paired associative stimulation
- Synaptic plasticity