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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.