Potencial evocado por estimulação do nervo mediano: comparação do tempo de condução central definido por diferentes pontos de medida

Manzano, G.M.; Nóbrega, J.A.M.; Novo, N.F.; Juliano, Y.

doi:10.1590/S0004-282X1994000100003

Resumos

Neste estudo é feita comparação entre a latência interpicos N13-N20 e entre inícios N11-N20. É evidenciada diferença significante entre essas medidas. Os achados sugerem ainda que as montagens usualmente utilizadas para a medida interpicos podem ser utilizadas para determinação das latências de inícios das ondas, bem como para determinação do ponto de fracionamento da medida entre inícios. É salientado o diferente significado fisiológico das duas medidas.

potencial evocado; somatossensorial; nervo mediano; tempo de condução central

After stimulation of the right median nerve in 20 normal adult volunteers interpeak latency N13-N20 and the difference in onset latency of the components N11-N20 are compared. A fractionation of the last measure was made at the onset of the P13-14 complex. The results concur with the ones in the literature, and it has been observed that all points measured could be obtained without significant difference on the C6-FZ and P3-FZ montages.

evoked potentials; somatosensory; median nerve; central conduction time

Potencial evocado por estimulação do nervo mediano: comparação do tempo de condução central definido por diferentes pontos de medida

Evoked potencial by median nerve stimulation: comparison of central conduction time defined by different measuring points

G.M. Manzano^I; J.A.M. Nóbrega^II; N.F. Novo^III; Y. Juliano^III

^IServiço de Neurofisiologia Clínica (SNFC) da Disciplina de Neurologia (DN) da Escola Paulista de Medicina (EPM): Médico, SNFC, DN, EPM

^IIServiço de Neurofisiologia Clínica (SNFC) da Disciplina de Neurologia (DN) da Escola Paulista de Medicina (EPM): Professor Adjunto, DN, EPM

^IIIServiço de Neurofisiologia Clínica (SNFC) da Disciplina de Neurologia (DN) da Escola Paulista de Medicina (EPM): Professor Adjunto, Disciplina de Bioestatística, Departamento de Medicina Preventiva, EPM

RESUMO

Neste estudo é feita comparação entre a latência interpicos N13-N20 e entre inícios N11-N20. É evidenciada diferença significante entre essas medidas. Os achados sugerem ainda que as montagens usualmente utilizadas para a medida interpicos podem ser utilizadas para determinação das latências de inícios das ondas, bem como para determinação do ponto de fracionamento da medida entre inícios. É salientado o diferente significado fisiológico das duas medidas.

Palavras-chave: potencial evocado, somatossensorial, nervo mediano, tempo de condução central.

SUMMARY

After stimulation of the right median nerve in 20 normal adult volunteers interpeak latency N13-N20 and the difference in onset latency of the components N11-N20 are compared. A fractionation of the last measure was made at the onset of the P13-14 complex. The results concur with the ones in the literature, and it has been observed that all points measured could be obtained without significant difference on the C6-FZ and P3-FZ montages.

Key words: evoked potentials, somatosensory, median nerve, central conduction time.

Texto completo disponível apenas em PDF.

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Aceite: 19-agosto-1993.

Este estudo é parte da Tese de Doutorado do Dr. G.M. Manzano. Durante a realização deste estudo o Dr. G.M. Manzano foi bolsista do CNPq.

Dr. G.M. Manzano - Rua Berta 204 - 04120-040 São Paulo SP - Brasil.

1. Allison T, Wood CC, Goff WR. Brain stem auditory, pattern-reversal visual, and short-latency somatosensory evoked potentials: latencies in relation to age, sex, and brain and body size. Electroenceph Clin Neurophysiol 1983, 55:616-636.
2. Cant BR, Shaw NA. Central somatosensory conduction time: method and clinical applications. In: Cracco RQ, Bodis-Wolner I (eds). Evoked potentials. New York: Alan R. Liss, 1986, p 58-67.
3. Chiappa KH. Evoked potentials in clinical medicine. Ed 2. New York: Raven Press, 1990.
4. Desmedt JE. Critical analysis of somatosensory evoked potential recording techniques. In: Luders H (ed). Advanced evoked potentials. Boston: Kluwer Academic Publ, 1989.
5. Desmedt JE, Cheron G. Central somatosensory conduction in man: neural generators and interpeak latencies of the far-field components recorded from neck and right or left scalp and earlobes. Eletroenceph Clin Neurophysiol 1980, 50:382-403.
6. Desmedt JE, Cheron G. Somatosensory evoked potential to finger stimulation in healthy octagenarians and in young adults: wave forms, scalp topography and transit times of parietal and frontal components. Electroenceph Clin Neurophysiol 1980, 50:404-425.
7. Desmedt JE, Cheron G. Non-cephalic reference recording of early somatosensory potentials to finger stimulation in adult or aging normal man: differentiation of widespread N18 and contralateral N20 from prerolandic P22 and N30 components. Eletroenceph Clin Neurophysiol 1981, 52:553-570.
8. Desmedt JE, Cheron G. Somatosensory evoked potentials in man: subcortical and cortical components and their neural basis. Ann NY Acad Sci 1982, 388:388-411.
9. Desmedt JE, Huy NT. Bit-mapped colour imaging of the potentials fields of propagated and segmental subcortical components of somatosensory evoked potentials. Electroenceph Clin Neurophysiol 1984, 58:481-497.
10. Hume AL, Cant BR. Conduction time in central somatosensory pathways in man. Electroenceph Clin Neurophysiol 1978, 45:361-375.
11. Manzano GM. Potencial evocado por estimulação do nervo mediano: comparação do tempo de condução central definido por diferentes pontos de medida. Tese de Doutorado, Escola Paulista de Medicina. São Paulo, 1992.
12. Mavroudakis N, Brunko E, Nogueira MC, Zegers de Beyl D. Acute effects of diphenylhydantoin on peripheral and central somatosensory conduction. Electroenceph Clin Neurophysiol 1991, 78:263-266.
13. Shaw NA. Central auditory conduction in the rat. Exp Brain Res 1990, 79:217-220.
14. Siegel S. Estatística não-paramétrica (para as ciências do comportamento). São Paulo: McGraw-Hill, 1975.
15. Zegers de Beyl D, Delberghe X, Herbaut AG, Brunko E. The somatosensory conduction time: physiological considerations and normative data. Electroenceph Clin Neurophysiol 1988, 71:17-26.
16. Zegers de Beyl D, Delecluse F, Verbanck P, Borenstein S, Capel P, Brunko E. Somatosensory conduction in vitamin B12 deficiency. Electroenceph Clin Neurophysiol 1988, 69:313-318.

Datas de Publicação

Publicação nesta coleção
19 Jan 2011
Data do Fascículo
Mar 1994

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

[1] 1. Allison T, Wood CC, Goff WR. Brain stem auditory, pattern-reversal visual, and short-latency somatosensory evoked potentials: latencies in relation to age, sex, and brain and body size. Electroenceph Clin Neurophysiol 1983, 55:616-636.

[2] 2. Cant BR, Shaw NA. Central somatosensory conduction time: method and clinical applications. In: Cracco RQ, Bodis-Wolner I (eds). Evoked potentials. New York: Alan R. Liss, 1986, p 58-67.

[3] 3. Chiappa KH. Evoked potentials in clinical medicine. Ed 2. New York: Raven Press, 1990.

[4] 4. Desmedt JE. Critical analysis of somatosensory evoked potential recording techniques. In: Luders H (ed). Advanced evoked potentials. Boston: Kluwer Academic Publ, 1989.

[5] 5. Desmedt JE, Cheron G. Central somatosensory conduction in man: neural generators and interpeak latencies of the far-field components recorded from neck and right or left scalp and earlobes. Eletroenceph Clin Neurophysiol 1980, 50:382-403.

[6] 6. Desmedt JE, Cheron G. Somatosensory evoked potential to finger stimulation in healthy octagenarians and in young adults: wave forms, scalp topography and transit times of parietal and frontal components. Electroenceph Clin Neurophysiol 1980, 50:404-425.

[7] 7. Desmedt JE, Cheron G. Non-cephalic reference recording of early somatosensory potentials to finger stimulation in adult or aging normal man: differentiation of widespread N18 and contralateral N20 from prerolandic P22 and N30 components. Eletroenceph Clin Neurophysiol 1981, 52:553-570.

[8] 8. Desmedt JE, Cheron G. Somatosensory evoked potentials in man: subcortical and cortical components and their neural basis. Ann NY Acad Sci 1982, 388:388-411.

[9] 9. Desmedt JE, Huy NT. Bit-mapped colour imaging of the potentials fields of propagated and segmental subcortical components of somatosensory evoked potentials. Electroenceph Clin Neurophysiol 1984, 58:481-497.

[10] 10. Hume AL, Cant BR. Conduction time in central somatosensory pathways in man. Electroenceph Clin Neurophysiol 1978, 45:361-375.

[11] 11. Manzano GM. Potencial evocado por estimulação do nervo mediano: comparação do tempo de condução central definido por diferentes pontos de medida. Tese de Doutorado, Escola Paulista de Medicina. São Paulo, 1992.

[12] 12. Mavroudakis N, Brunko E, Nogueira MC, Zegers de Beyl D. Acute effects of diphenylhydantoin on peripheral and central somatosensory conduction. Electroenceph Clin Neurophysiol 1991, 78:263-266.

[13] 13. Shaw NA. Central auditory conduction in the rat. Exp Brain Res 1990, 79:217-220.

[14] 14. Siegel S. Estatística não-paramétrica (para as ciências do comportamento). São Paulo: McGraw-Hill, 1975.

[15] 15. Zegers de Beyl D, Delberghe X, Herbaut AG, Brunko E. The somatosensory conduction time: physiological considerations and normative data. Electroenceph Clin Neurophysiol 1988, 71:17-26.

[16] 16. Zegers de Beyl D, Delecluse F, Verbanck P, Borenstein S, Capel P, Brunko E. Somatosensory conduction in vitamin B12 deficiency. Electroenceph Clin Neurophysiol 1988, 69:313-318.