Ryoji Kayamori

Learn More
Short- and long-latency somatosensory evoked potentials (SEPs) were elicited by stimulation of the median nerve in 43 patients with neurological disorders. Abnormalities of short-latency peaks, P9, N13, and P14, were seen in patients with lesions of the peripheral nerve, cervical spinal cord, and brain stem, respectively. Subsequent component, N18, was(More)
We studied topography of major negative-positive peaks, NI, PI, NII, PII and NIII, of scalp recorded somatosensory evoked potentials (SEP) after stimulation of the median nerve. Unlike the diffusely distributed P14, NI, PI and NII recorded from contralateral hemisphere after unilateral stimulation normally showed statistically significant latency increase(More)
Brainstem auditory evoked potential (BAEP) and blink reflex (BR) were abnormal in 40% and 26% of 130 patients with MS. Overall, BR was affected in 53% of patients with abnormal BAEP involving I-III and 41% of those involving III-V interval. In 23 patients with unilateral BR involvement, BAEP was affected ipsilaterally in 10, contralaterally in 0 and(More)
A patient with MRI confirmed lesions in the corpus callosum and the left cingulate gyrus had a rare syndrome of crossed avoiding reaction of the left hand. With the right hand she could reach a stimulus object in whatever space it was presented. With the left hand, however, she could not mobilise it to reach a stimulus presented in the right hemispace(More)
We tested the validity of instructing patients to minimally contract the muscle to facilitate F-wave recording in clinical practice. In 12 healthy subjects, F waves were recorded from the first dorsal interosseous muscle at rest, during motor imagery, and at up to 30% of the maximal voluntary contraction (MVC). F-wave persistence increased significantly(More)
An anomalous median-ulnar nerve communication in the forearm (Martin-Gruber anastomosis) is not rare. Knowledge of this crossover is of crucial importance in the clinical evaluation of nerve injuries of median and ulnar nerves as well as in accurate interpretation of nerve conduction velocity of these nerves especially in association with carpal tunnel(More)
A patient with Schmidt syndrome due to idiopathic accessory neuropathy has had paralysis of soft palate and larynx as well as trapezius and sternocleidomastoid muscles, reflecting involvement of cranial and spinal roots, respectively. In addition to vocal cord paralysis on the laryngoscopy, videofluoroscopy confirmed diminished mobility of the soft palate.(More)
Electrophysiological criteria for carpal tunnel syndrome (CTS) may be defined by difference of the distal latencies between median and ulnar nerves in the same hand greater than 2 SD from the normal mean. Based on the data in 20 normal subjects (10 men and 10 women), the criteria for abnormality were distal sensory latency (DSL) over 0.9 msec and/or distal(More)
OBJECT The authors have developed a technique for the treatment of facial paralysis that utilizes anastomosis of the split hypoglossal and facial nerve. Here, they document improvements in the procedure and experimental evidence supporting the approach. METHODS They analyzed outcomes in 36 patients who underwent the procedure, all of whom had suffered(More)
Serial changes of EEG, BR and BAEP recordings were obtained over a period of two days on two patients who had suffered massive cerebral hemorrhage while their clinical condition evolved from coma with evidence of preserved cerebral and brainstem functions to a state meeting the criteria of brain death. As clinical evidence of deteriorating brainstem(More)