Abstract:
:Augmenting/reducing (A/R) of visual evoked potentials (VEP) has been repeatedly observed in central derivations, with some subjects increasing, and others decreasing, VEP amplitude with increasing intensity of stimulation. Central derivations also exhibit hemispheric lateralization regarding A/R. This paper explores central and occipital VEP in the same population of 16 healthy, right-handed male subjects, stimulated with binocular light flashes 10 usec in duration delivered by à Grass PS2 stimulator at a rate of 1/sec and at the intensities of 0.36, 0.72 and 1.44 joules at source. Amplitudes and latencies of components P1, N1 and P2 agreed with those reported in the literature. On the basis of amplitude/intensity slope functions of "peak to peak" amplitudes (P1N1 and NIP2) at Cz, 10 augmenters (slope greater than 0) and 6 reducers (slope smaller than 0) were found. Compared to central leads (C3 and C4) occipital ones (O1 and O2) did not exhibit significant interhemispheric differences. Vertex augmenters for N1P2 were occipital reducers and vice-versa. The different characteristics of A/R at occipital and central leads are interpreted in terms of stages of visual information processing in primary and association areas and functional significance of VEP components.
journal_name
Arq Neuropsiquiatrjournal_title
Arquivos de neuro-psiquiatriaauthors
Etcheberrigaray R,Lolas F,Camposano S,Elgueta Ddoi
10.1590/s0004-282x1988000300005subject
Has Abstractpub_date
1988-09-01 00:00:00pages
258-63issue
3eissn
0004-282Xissn
1678-4227journal_volume
46pub_type
杂志文章abstract:OBJECTIVE:This study aims to provide information about epidemiological factors related to traumatic brachial plexus injuries in adults. METHOD:Prospective analysis of 35 consecutive cases, observed in a period of one year. RESULTS:Most of the lesions were supraclavicular (62%). Twenty-one cases occurred due to tracti...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章
doi:10.1590/s0004-282x2006000100018
更新日期:2006-03-01 00:00:00
abstract:INTRODUCTION:Epileptic manifestations of Neurocysticercosis (NC) appear to depend on number and localization of the cysts. The objective of this study was to investigate the relationship between CT findings, number of parasites and the evolutive stage of the cysts, and the prognosis of epilepsy in children with NC. ME...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章
doi:10.1590/s0004-282x2002000100001
更新日期:2002-03-01 00:00:00
abstract::The aim of this study was to investigate the cardiovascular risk profile of the participants recruited from stroke awareness campaigns in Santa Maria RS, Brazil, from 2012 to 2016, using the simplified version of the Framingham Risk Score (FRS). Questionnaires were used to evaluate 1,061 participants from 20 to 74 yea...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章
doi:10.1590/0004-282x20180020
更新日期:2018-04-01 00:00:00
abstract::Neurocysticercosis is a serious public health problem that predominantly affects places with poor sanitary and hygiene conditions. The Piaui State is out of the neurocysticercosis map in Brazil but, as this study illustrates, it is just by lack of epidemiologic data. We demonstrate the presence of this pathology in th...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章
doi:10.1590/s0004-282x2006000200030
更新日期:2006-06-01 00:00:00
abstract::Désiré-Magloire Bourneville ought to be thought of as the father of Pediatric Neurology for his significant contributions to the field. He worked as a physician, politician, writer, and editor. He was the first to describe the autosomal dominant genetic condition known as "tuberous sclerosis complex", after conducting...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 传,历史文章,杂志文章
doi:10.1590/0004-282X20190009
更新日期:2019-05-13 00:00:00
abstract:BACKGROUND:The effect of gastrointestinal system disorders on Restless Legs Syndrome/Willis-Ekbom disease (RLS/WED) has been previously demonstrated by using serological tests. However, this association has not been supported by histopathological studies so far. OBJECTIVE:To investigate the relationship between RLS/WE...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章
doi:10.1590/0004-282X20190192
更新日期:2020-04-01 00:00:00
abstract::Objective The aim of this study was to obtain data on phrenic neuroconduction and electromyography of the diaphragm muscle in difficult-to-treat asthmatic patients and compare the results to those obtained in controls. Methods The study consisted of 20 difficult-to-treat asthmatic patients compared with 27 controls. S...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章
doi:10.1590/0004-282x20180010
更新日期:2018-03-01 00:00:00
abstract:OBJECTIVE:To observe whether microsurgical removal of medullary lipomas and untethering of the medulla is a safe and efficient procedure. METHOD:A retrospective study was carried out on 38 patients with medullary lipomas associated with spinal dysraphism who underwent operations between January 1986 and January 2008, ...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章
doi:10.1590/s0004-282x2011000500019
更新日期:2011-08-01 00:00:00
abstract:UNLABELLED:Mechanical thrombectomy as an adjunctive to intravenous thrombolysis is now the standard treatment for acute ischemic stroke (AIS) due to large vessel occlusions. However, the best management of acute carotid tandem occlusions (CTO) remains controversial. METHOD:Twenty patients underwent endovascular treatm...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章
doi:10.1590/0004-282X20150213
更新日期:2016-03-01 00:00:00
abstract::The temporal medial sclerosis (TMS) is characterized by hippocampal sclerosis in temporal and by distinguished grades of injury near to other neurological structures such as: amygdaloid nucleus, parahippocampal girus and entorhinal region. The study analyzed 40 patients with TMS and 40 people from the control cluster....
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章
doi:10.1590/s0004-282x2006000400023
更新日期:2006-09-01 00:00:00
abstract::This review describes therapeutically relevant mechanisms of action of botulinum toxin (BT). BT's molecular mode of action includes extracellular binding to glycoproteine structures on cholinergic nerve terminals and intracellular blockade of the acetylcholine secretion. BT affects the spinal stretch reflex by blockad...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章,评审
doi:10.1590/s0004-282x2005000100035
更新日期:2005-03-01 00:00:00
abstract::Genetic and environmental factors affect the pathogenesis of Parkinson's disease (PD). Genetic variants of the enzyme glutathione S-transferases (GST) may be related to the disease. This study aimed to evaluate the influence of genetic variants of GST (GSTT1/GSTM1) and their association with the exposure to environmen...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章
doi:10.1590/0004-282X20130076
更新日期:2013-08-01 00:00:00
abstract::A child, who had undergone ventriculoperitoneal shunting, presented with repeated episodes of pneumonia and expectoration of CSF. Chest x-ray demonstrated the presence of the shunt catheter in the base of the left lung. In the present case the distal end of the catheter perforated the diaphragm, entering the thoracic ...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章
doi:10.1590/s0004-282x1980000400013
更新日期:1980-12-01 00:00:00
abstract::Mitochondrial myopathy, Encephalopathy, Lactic Acidosis, and Stroke-like episodes (MELAS) is a rare mitochondrial disorder. Diagnostic criteria for MELAS include typical manifestations of the disease: stroke-like episodes, encephalopathy, evidence of mitochondrial dysfunction (laboratorial or histological) and known m...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章,评审
doi:10.1590/0004-282X20150154
更新日期:2015-11-01 00:00:00
abstract:UNLABELLED:Attention deficit hyperactivity disorder (ADHD) is a frequent condition in school-age children and commonly presents in comorbidity with other psychiatric diseases. In Brazil, there are few studies concerning non-clinical samples. PURPOSE:The present study aims to calculate the prevalence of this disorder a...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章
doi:10.1590/s0004-282x2007000600033
更新日期:2007-12-01 00:00:00
abstract::Epilepsy is one of the most dreaded and terrifying human afflictions. One of the many names it has received was Sacred Disease, during Greek times. Heracles served as a source of the divine connotation that epilepsy received in ancient times, as he was one of the most important demigods in Greek mythology. However, se...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 历史文章,杂志文章,评审
doi:10.1590/0004-282X20200085
更新日期:2020-10-01 00:00:00
abstract::The association between the use of statins and neuromuscular disease is currently being intensely discussed. We relate a 63 years old man with possible case of statin-induced neuropathy in a patient with dislipidemia in use of simvastatina at high doses. The electrophysiologic studies disclosed findings compatible wit...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章
doi:10.1590/s0004-282x2004000300031
更新日期:2004-06-01 00:00:00
abstract::A case of carotid-basilar anastomose with persistence of the primitive hypoglossal artery is reported. The authors related aspects of intracranial aneurysm. Anatomical, embryological, physiopathological and angiographical aspects are discussed. ...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章
doi:10.1590/s0004-282x1980000300011
更新日期:1980-09-01 00:00:00
abstract:OBJECTIVE:Basilar tip aneurysms (BTAs) have a complex anatomy, making them difficult to treat. We describe our surgical results for BTAs. METHODS:From 2004 to 2015 (12 years), a total of 25 small BTAs and two giant BTAs were treated in the Hospital do Servidor Público Estadual de São Paulo. RESULTS:In 23 patients har...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章
doi:10.1590/0004-282x20170120
更新日期:2017-10-01 00:00:00
abstract::We report on 15 cases of medulloblastoma of adult onset (8 male and 7 female) operated upon posterior fossa approach from February 1988 to October 1995. Tumors were localized in cerebellar hemisphere in 7 cases (one with extension to supratentorial notch and another case reaching the cerebello-pontine angle cistern), ...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章
doi:10.1590/s0004-282x1999000600014
更新日期:1999-12-01 00:00:00
abstract::Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease that affects the corticospinal tract. ALS functional rating scale (ALSFRS) is a questionnaire that quantifies motor deficits, while diffusion tensor imaging (DTI) evaluates the integrity of fibers through the fractional anisotropy (FA). In the present ...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章
doi:10.1590/s0004-282x2007000500029
更新日期:2007-09-01 00:00:00
abstract::Congenital muscle dystrophy (CMD) is a heterogeneous group of autosomal recessive myopathies. It is known that CMD may affect the central nervous system (CNS). Some authors have shown that merosin-negative CMD patients may have encephalic metabolic disturbances. In order to study metabolic changes within the brain, th...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章
doi:10.1590/s0004-282x2007000100035
更新日期:2007-03-01 00:00:00
abstract::The appearance of unilateral papilledema in the fundus photos of 6 women with pseudotumor cerebri is presented. Associated findings included obesity in 5 and a partially empty sella in 2. The possible explanations for the development of unilateral papilledema in pseudotumor cerebri are reviewed and favor a mechanism t...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章
doi:10.1590/s0004-282x1985000200005
更新日期:1985-06-01 00:00:00
abstract:UNLABELLED:Psychiatric disorders are frequent among patients with epilepsy. Data in the literature have shown a heterogeneous clinical presentation of psychiatric disorders in patients with epilepsy. Interictal dysphoric disorder could be a specific psychiatric comorbidity associated with epilepsy, primarily in patient...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章
doi:10.1590/0004-282X20130165
更新日期:2013-11-01 00:00:00
abstract::Although fatigue is an expressive symptom of Parkinson's disease (PD), few studies have investigated the association between fatigue, mobility and walking capacity of these patients. OBJECTIVE:To investigate whether fatigue is an independent factor associated with mobility and the walking capacity in patients with PD...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章
doi:10.1590/0004-282X20190136
更新日期:2020-02-01 00:00:00
abstract::An electrophysiological investigation of the state of the neuromuscular transmission (nmt) was carried out in 58 patients with the diagnosis of chronic Chagas' disease. On repetitive supramaximal nerve stimulation it was found that some patients did not show abnormalities, others had decremental muscle responses, othe...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章
doi:10.1590/s0004-282x1989000300004
更新日期:1989-09-01 00:00:00
abstract::A case of a 29-year-old male with a huge sacrococcygeal teratoma completely removed by surgery, and associated with a sacral agenesis is reported. Roentgenograms revealed fusion of the T12, L1, L2, and L3 vertebral bodies, absence of the left 12th rib, partial agenesis of sacrococcygeal elements and a lumbar scoliosis...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章
doi:10.1590/s0004-282x1987000100011
更新日期:1987-03-01 00:00:00
abstract::Ketogenic diet (KD) is a high fat and low carbohydrate diet, which controls refractory epilepsy. We analyzed the KD effects on 54 children of the Children's Institute of the University of São Paulo. Efficacy, tolerability, and adverse effects were studied. Response to KD was effective (E) if seizure control was >75%, ...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章
doi:10.1590/s0004-282x2007000300003
更新日期:2007-06-01 00:00:00
abstract::Sleep and epilepsy share some common mechanisms. The objective of the present investigation was to study the macrostructure of sleep in patients with idiopathic epilepsies, focal and generalized, comparing these two groups to each other and to a control group of 12 individuals without epilepsy. A total of 35 polysomno...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章
doi:10.1590/s0004-282x2002000300002
更新日期:2002-06-01 00:00:00
abstract::Creutzfeldt-Jakob disease (CJD), the most known human prion disease, is usually sporadic but approximately 15% of the cases are familial. To date, seven CJD cases with codon 210 mutation (GTT to ATT) have been reported in the literature. We describe a case of a 57 year-old woman who presented gait disturbances and rap...
journal_title:Arquivos de neuro-psiquiatria
pub_type: 杂志文章
doi:10.1590/s0004-282x2001000600017
更新日期:2001-12-01 00:00:00