Nota Clínica

New thalamic potential associated with somatosensory evoked potentials

L. Vega-Zelaya, C.V. Torres, M. Navas-García, R. García-Sola, J. Pastor [REV NEUROL 2017;65:322-326] PMID: 28929474 DOI: https://doi.org/10.33588/rn.6507.2017209

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Volumen 65 | Number 07 | Nº of views of the article 5.067 | Nº of PDF downloads 327 | Article publication date 01/10/2017

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ABSTRACT

INTRODUCTION The response of the thalamus during the study with somatosensory evoked potentials (SSEP) is not sufficiently understood.

CASE REPORT A 17-year-old man undergoing surgery for deep brain stimulation in the centromedian nucleus for drug-resistant epilepsy under complete sedation. During the intervention, the responses to SSEPs of the thalamic nuclei were recorded by means of four microelectrodes. These responses can be decomposed into three types: local field potentials (LFP), low amplitude fast oscillations (LFO), and high amplitude slow oscillations (HSO). LFO are widespread in much of the registered regions. However, HSOs are located at a single point in the registry and are closely associated with LFPs.

CONCLUSIONS Although the presence of LFO has been considered as an indicator of the presence of the sensory thalamus, its wide extension by different thalamic nuclei suggests that it is an unspecific response to SSEPs. However, the restricted spatial location of HSO and their association with LFP suggest that these newly described potentials are the markers for the presence of the sensory thalamus. Their identification may prove very useful in thalamic deep brain stimulation either in awake patients or especially in those requiring sedation. KeywordsDeep brain stimulation Drug-resistant epilepsy Extracellular recording High frequency oscillations Local field potentials Sensory thalamus CategoriesTécnicas exploratorias

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Nota Clínica

New thalamic potential associated with somatosensory evoked potentials

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