Biomedical subjects
Publications and source records attributed to F Matsuo.
An atypical form of herpes simplex encephalitis produced by HSV-1 documented in the present article demonstrates that (1) prominent EEG abnormality may correlate with subtle increase in signal intensity on MRI; (2) the disease may start with prominent involvement of the cingulate gyri; and (3) viral infection of the brainstem may cause early onset of severe neurologic dysfunction and coma.
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Aided by computerized voltage topographic display, conventional time-series EEG display methods were expanded. Representations of both negative and positive ends of an equivalent current dipole can be localized in EEG sampled over the head surface. Intuitive EEG analysis can be applied to source localization in three dimensions of scalp focal epileptiform discharges.
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We postulate that palatal myoclonus after infarction of the brainstem or cerebellum, or both, is the manifestation of denervation supersensitivity secondary to lesions involving the dentatorubroolivary system. Two cases of our own and 31 from the English and French literature were analyzed in order to determine the delay between the occurrence of presumed anatomical lesions and the recognition of palatal myoclonus. The intervals varied from 2 to 49 months with the median between 10 and 11 months. The natural history of palatal myoclonus following brainstem infarction seemed consistent with the hypothesis.
Focal positive spikes and sharp waves in clinical EEG are uncommon (about 1.3 per 1,000 EEGs in this series) and encountered chiefly in early life. All of out seven patients suffered from a convulsive disorder. These discharges must be differentiated from 14 and 6 c/sec positive bursts. Atifactual electrical transients with apparent focal positivity must always be ruled out. Whenever focal positive spikes and sharp waves are identified, it is advisable to search for simultaneous focal negative discharges. The literature indicates that focal positive spikes and sharp waves could be classified according to the presumed pathophysiological mechanisms and illustrative patients were described.
A retrospective study of standard EEG's obtained from 26 patients with benign intracranial hypertension was done with particular emphasis on the effect of age on the EEG findings. Abnormal EEG's were found in 10 patients, all were less than 20 years of age. Although no consistent pattern of EEG abnormality could be identified, there appears to be a difference between the immature and adult brain in the EEG response to intracranial hypertension.
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A series of observations were made on a normal subject, a subject with a non-metallic prosthesis and one with unilateral facial paralysis in order to demonstrate the role of the eyelid in the production of the electrical potential seen during blinking. The findings support the hypothesis that moving the eyelid over the positively charged cornea of an intact ocular globe alters the electrical field around the globe and is therefore responsible for the recorded potentials. The data are consistent with previous findings that the polarity of the potential due to eyelid movement is opposite that due to vertical ocular rotation in the same direction. The potential occurs in the absence of ocular rotation.
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