Visual Evoked Potentials
Mostrando 13-24 de 149 artigos, teses e dissertações.
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13. Visual acuity evaluation in children with hydrocephalus : an electrophysiological study with sweep visual evoked potential / Avaliação da acuidade visual em crianças com hidrocefalia : um estudo eletrofisiológico por potencial visual evocado de varredura
O objetivo do estudo foi medir a acuidade visual (AV) em crianças com diagnóstico de hidrocefalia, apresentando ou não a válvula de derivação ventricular (DVP). Participaram da pesquisa um total de 55 crianças (34 F e 21M) com diagnóstico de hidrocefalia (45 com DVP e 10 sem DVP), com idade entre zero a 291 semanas (média 74 semanas). A AV foi medid
Publicado em: 2008
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14. Desenvolvimento das funções de acuidade visual e sensibilidade ao contraste visual medidas por potenciais visuais provocados de varredura em crianças nascidas a termo e prematuras / Development of visual acuity functions and visual contrast sensitivity mesaured by visual evoked potentials in premature and term babies
A prematuridade ao nascimento é um fator de risco para a visão, podendo causar retinopatia, uma condição em que há descolamento da retina. Retinopatia da prematuridade ocorre em uma parcela relativamente pequena dos recém nascidos prematuros e não sabemos se os demais, cujo desenvolvimento visual é aparentemente normal, seguem de fato o mesmo curso q
Publicado em: 2007
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15. Contrast sensitivity threshold measured by sweep-visual evoked potential in term and preterm infants at 3 and 10 months of age
Although healthy preterm infants frequently seem to be more attentive to visual stimuli and to fix on them longer than full-term infants, no difference in visual acuity has been reported compared to term infants. We evaluated the contrast sensitivity (CS) function of term (N = 5) and healthy preterm (N = 11) infants at 3 and 10 months of life using sweep-vis
Brazilian Journal of Medical and Biological Research. Publicado em: 2004-09
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16. Desenvolvimento da acuidade visual de resolução de grades de cães da raça terrier brasileiro pelo método do potencial visual evocado de varredura / Grating visual acuity development of brazilian terriers dogs using the sweep visual evoked potential method
O objetivo deste trabalho foi medir o desenvolvimento da acuidade visual (AV) de resolução de grades de filhotes de cães da raça Terrier Brasileiro utilizando-se o método do potencial visual evocado de varredura (PVEV). Foram mensuradas as AVs de resolução de grades de 18 cães da raça Terrier Brasileiro, 14 filhotes (8 machos e 6 fêmeas), de duas n
Publicado em: 2004
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17. Normatização do eletrorretinograma por padrão alternado
The objective of this study is to standardize recordings of PattemElectroretinograms (PERG) in normal human subjects. The standartization followed the model proposed by the Intemational Organization of Eletroretinography and was specific for the laboratory of evoked potentials of the Department of Neurology, Faculty of Medical Sciences, State University of C
Publicado em: 2000
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18. O emprego do potencial de longa latencia (P3) no diagnostico de complicações neurologicas e psiquicas do lupus eritematoso sistemico : comparação com a avaliação clinica e neuropsicologica
In an attempt to correlate neurological and neuropsychological findings with long-latency (endogenous) evoked potentials parameters, thirty-three female patients with a diagnosis of systemic lupus erythematosus were studied as to their visual auditory (brainstem), somatosensory (short latency and cortical) and long-latency (endogenous, P300) auditory evoked
Publicado em: 1998
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19. Evoked potentials and contingent negative variation during treatment of multiple sclerosis with spinal cord stimulation.
Cervical somatosensory evoked potentials, brainstem evoked potentials, visual evoked potentials, and the cerebral contingent negative variation were recorded in patients with definite multiple sclerosis before, during, and after spinal cord stimulation. Improvements were seen in the cervical somatosensory and brainstem evoked potentials but neither the visua
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20. Visual, cortical somatosensory and brainstem auditory evoked potentials following incidental irradiation of the rhombencephalon.
Visual, cortical somatosensory and brainstem auditory evoked potentials were recorded before incidental irradiation of the rhombencephalon and at 11 weeks and eight months after completion of treatment. No patient experienced neurological symptoms during this period. No consistent changes in evoked potentials were found. The failure to demonstrate subclinica
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21. Effects of induced hyperthermia on visual evoked potentials and saccade parameters in normal subjects and multiple sclerosis patients.
A convenient method for raising body temperature has been developed and used to evaluate temperature effects on visual evoked potentials and saccade reaction time and velocity in five normal subjects and five patients with multiple sclerosis.
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22. Assessment of central visual function after successful retinal detachment surgery by pattern visual evoked cortical potentials.
The pattern of visual recovery after successful surgery by pattern visual evoked cortical potentials (VECP), visual acuity, colour vision, and critical fusion frequency was investigated in 14 eyes with retinal detachment involving the macula. The temporal tuning characteristics in the evoked potentials were measured as based on the P100 amplitude and the fre
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23. Evoked potential changes in clinically definite multiple sclerosis: a two year follow up study.
Visual, spinal and somatosensory evoked potentials were performed on 56 patients with clinically definite multiple sclerosis at the beginning and end of a 2 1/2 year follow-up period. At the initial examination one or both visual evoked potentials were abnormal in all but nine patients (84%), five of whom had abnormalities of either spinal or somatosensory e
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24. Visual evoked potentials and dietary long chain polyunsaturated fatty acids in preterm infants.
The influence of dietary long chain polyunsaturated fatty acid (LCP) supply, and especially of docosahexaenoic acid (DHA), on evoked potential maturation, was studied in 58 healthy preterm infants using flash visual evoked potentials (VEPs), flash electroretinography (ERG), and brainstem acoustic evoked potentials (BAEPs) at 52 weeks of postconceptional age.