Resumo

CRUZ MENOR, Ernesto; HERNANDEZ RODRIGUEZ, Yunit; CRUZ MENOR, Marlén  e  RIOL LOZANO, Juan M. Topographical distribution of the cortical response of the somatosensorial evoked potencial of the posterior tibial nerve. Rev Ciencias Médicas [online]. 2006, vol.10, n.3, pp. 01-10. ISSN 1561-3194.

The cortical response of the somatosensorial evoked potential of the posterior tibial nerve has shown, in different research works, a great variability in terms of the results obtained by different authors. The aims of this paper were to evaluate in a sample of healthy adult individuals the topographical distribution of the cortical response of the somatosensorial evoked potential of the posterior tibial nerve by using a protocol registration with 19 derivations from the International System 10/20 in the MEDICID-4 team. Eighteen adult individuals were studied. In each individual the cortical response was P40,  remaining the 19 registration canals, modifying the filter between 0.5 and 300 Hz, and the sampling frequency was modified to 1000 Hz. Results show a maximum amplitude of the P40 in the middle line. In addition, simultaneously, such response is registered in the central parietal ipsilateral region, with no great intraindividual and interindividual variability. As a conclusion, the stimulation of the tibial nerve and peak P40 showed a cortical central parietal distribution in the middle line, as well as ipsilaterally, with maximum amplitude in the latter. P40 was obtained paradoxically with a greater amplitude towards the same region of the stimulated site.

Palavras-chave : EVOKED POTENTIALS; POSTERIOR TIBIAL NERVE; PARADOXICAL LATERALIZATION OF THE RESPNSE.

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