Navegando por Palavras-chave "median nerve"

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    Componente p18 do potencial evocado somatossensitivo por estimulação do nervo mediano
    (Universidade Federal de São Paulo (UNIFESP), 2014-12-31) Giuliano, Lydia Maria Pereira [UNIFESP]; Manzano, Gilberto Mastrocola Manzano [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    Objective: To investigate the P18 component in the posterior to anterior neck montage after median nerve stimulation. Methods: Somatosensory evoked potentials, through electrical wrist stimulation, were collected. In 12 subjects, the presence of the P18 component was evaluated in the posterior to anterior neck montage. In 10 subjects, the effects of stimulation vibration of the hand were evaluated. In five subjects, responses after double-pulse stimulation (ISI 20 ms) were evaluated. Results: The component P18 was identified in all subjects. Vibration reduced the amplitude of all components except the P18 and N18. Double-pulse stimulation reduced the amplitude of the P18 and the N18 components without significantly changing the amplitude of the others components. Conclusions: The posterior to anterior neck montage allows for recording the P18 component. The amplitude reduction of all components during vibration, exceptN18 and P18, is interpreted as reflecting inhibitory activities at the cuneiform nucleus and the segmental dorsal horn of the spinal cord, respectively. The reduction in the P18 component after double-pulse stimulation is compatible with previous observations on the positive component of cord dorsum potentials. Significance: Studying this component may add to the knowledge of function of the spinal cord in humans.
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    Median nerve SEP after a high medullary lesion: preserved N18 and absent P14 components (case report)
    (Academia Brasileira de Neurologia - ABNEURO, 1999-06-01) Manzano, Gilberto Mastrocola [UNIFESP]; Schultz, Rodrigo Rizek [UNIFESP]; Barsottini, Orlando Graziani Povoas [UNIFESP]; Zukerman, Eliova [UNIFESP]; Nóbrega, João Antonio Maciel [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    Median nerve SEPs recorded from a patient with a high medullary lesion are described. The lesion involved the anteromedial and anterolateral right upper third of the medulla, as documented by MRI. Forty one days after the lesion, left median nerve SEP showed preserved N18 and absent P14 and N20 components; stimulation of the right median nerve evoked normal responses. These findings agree with the proposition that low medullary levels are involved in the generation of the N18 component of the median nerve SEP.
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    The N18 component of the median nerve SEP is not reduced by vibration
    (Elsevier B.V., 1998-09-01) Manzano, G. M.; Negrao, N.; Nobrega, JAM; Universidade Federal de São Paulo (UNIFESP); Universidade de São Paulo (USP)
    Objective: To study the interference of mechanical vibration of the palm of the hand on the median nerve short-latency SEP components.Methods: Electrically-elicited short-latency median nerve SEP were obtained before and during mechanical vibration (120 Hz) of the palm in two groups of normal individuals (6 in group I and 9 in group II). the amplitude of the different components was compared between the two conditions through non-parametric statistical tests.Results: A significant reduction in the amplitude of the N9, P13/14 and N20 components was detected, however no overall significant changes were detected for the N18 component.Conclusions: Vibration interference reduced all studied components except the N18. these findings are interpreted as supporting evidence fur the proposed association between the N18 component and the inhibitory activities elicited in the dorsal column nuclei. (C) 1998 Elsevier Science Ireland Ltd. All rights reserved.
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    Potencial evocado por estimulação do nervo mediano (PESS): componentes subcortical
    (Academia Brasileira de Neurologia - ABNEURO, 1994-03-01) Manzano, Gilberto Mastrocola [UNIFESP]; Nóbrega, J.a.m. [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    A review of the literature is done regarding designation, potential fields and implicated generators for subcortical components of the short latency median nerve somatosensory evoked potentials.
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    Potencial evocado por estimulação do nervo mediano: comparação do tempo de condução central definido por diferentes pontos de medida
    (Academia Brasileira de Neurologia - ABNEURO, 1994-03-01) Manzano, Gilberto Mastrocola [UNIFESP]; Nóbrega, J.a.m. [UNIFESP]; Novo, Neil Ferreira [UNIFESP]; Juliano, Y. [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    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.