Sensory evoked response to electrical stimulation of the trigeminal nerve in humans

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✓ Electrical stimulation of the upper and lower lips of normal subjects evoked a consistent response recorded from over the face area of the ipsi- and contralateral hemispheres. This response consisted of seven discrete waves. Peak latencies ranged from as early as 8 msec to 115 msec. Stimulation of the lower lip evoked a response of lower amplitude and reversed polarity, as compared to the upper lip stimulation response. The data support the validity of the trigeminal sensory evoked response in the evaluation of the trigeminal pathways. Previously reported methods are reviewed and compared.

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Address reprint requests to: Gideon Findler, M.D., Department of Neurosurgery, Hadassah Medical Center, Ein-Kerem, Jerusalem, Israel.

© AANS, except where prohibited by US copyright law.

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    Trigeminal somatosensory evoked responses (TSER's) obtained from the upper (both upper graphs) and lower (both lower graphs) lips of a healthy 27-year-old woman. The left graphs of both upper and lower lip recordings show the early waves obtained on a time base of 50 msec. These were obscure on the 250-msec time base recording due to differences in the amplifier bandpass (see Materials and Methods section). Left (LT) and right (RT) refer to hemispheres. In both recordings, the right side of the lips was stimulated. Negative deflection is upward. S = stimulation.

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