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The human auditory steady state evoked potentials were recorded during all-night sleep in 10 subjects. The effects of stimulus rate and intensity on these potentials were measured using on-line Fourier analysis. The amplitude of the response was greatest at stimulus rates of 30 to 50/sec. Although the response amplitude was lower during sleep, the rate at(More)
Thirty-two pediatric patients presenting with symptoms of urinary dysfunction, stool incontinence and/or severe back and/or leg pain are described. In patients with urological dysfunction, urodynamic testing was consistent with a neurogenic etiology. Imaging studies demonstrated the tip of the conus medullaris to lie above the L2 vertebral body, and the(More)
An accurate neurophysiological technique that is able to monitor both the sensory and motor tracts of the spinal cord is required to assess patients with injury or other lesions of the cord, and for the evaluation of experimental studies of cord injury. We have recorded and characterized the motor and somatosensory evoked potentials (MEPs and SSEPs) from 20(More)
There is evidence that posttraumatic ischemia is important in the pathogenesis of acute spinal cord injury (SCI). In the present study spinal cord blood flow (SCBF), measured by the hydrogen clearance technique, and motor and somatosensory evoked potentials (MEP and SSEP) were recorded to evaluate whether the administration of nimodipine and dextran 40,(More)
Techniques used to monitor the function of the seventh and eighth cranial nerves during acoustic neuroma and other posterior fossa surgery are reviewed. The auditory brainstem response (ABR), electrocochleogram (ECochG) and direct recording from the auditory nerve (CNAP) were compared. The best technique is the ECochG, although in many cases, the CNAP(More)
STUDY DESIGN A 6 year retrospective study was conducted. OBJECTIVES The populations at risk for spinal cord injury (SCI) in the northwestern Kentucky (KY) and southern Indiana (IN) regions were identified following examination of the causes and factors associated with SCI. SETTING The database included patients primarily from the surrounding KY and IN(More)
To characterize the changes in axonal function in the motor and somatosensory tracts of the cord after spinal cord injury (SCI) and to correlate these changes with spinal cord blood flow (SCBF), the relationships among the severity of SCI, motor and somatosensory evoked potentials (MEPs and SSEPs) and SCBF were examined. Fifteen rats received a 1.5 g (n =(More)
A need exists for an accurate neurophysiological technique that monitors the motor tracts of the cord in patients with spinal cord injury or other cord lesions and for the evaluation of experimental models of cord injury. We have recorded and characterized the motor evoked potentials (MEPs) from 10 normal rats and from 10 rats with the following cord(More)
The ability of magnetic resonance imaging (MRI) to display the anatomic changes after spinal cord injury in the rat were examined in postmortem specimens. With the clip compression technique, acute spinal cord injuries of three grades of severity were produced in adult male rats. One hour after injury, during which time physiological parameters were(More)
The effects of the various anesthetic agents on the production of transcranial magnetic motor evoked potentials (tcMMEP) were studied in a canine model. Pre-anesthetic baseline tcMMEPs demonstrated consistency in onset latency measurements and variability in measurement of peak-to-peak amplitudes. Changes in tcMMEPs were evaluated following the individual(More)