Vector analysis of visual evoked potentials in migraineurs with visual aura

Coutin-Churchman, Pedro; Freytez, Alix Padrón de

doi:10.1016/s1388-2457(03)00229-3

Cited by 17 publications

(10 citation statements)

References 16 publications

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“…medications display no difference in VEP response compared with control subjects [16]. A vector analysis study suggests that the topographic distribution of cortical VEP is asymmetrical, almost as much as in those with welldefined occipital lobe lesions [17]. This hyper-responsiveness of the visual system can be demonstrated with nonvisual stimuli as well.…”

Section: Descriptionmentioning

confidence: 86%

Visual disturbances and migraine

Maxner

Moeller

2005

Curr Neurol Neurosci Rep

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There is a close relationship between headache and the visual system. Visual symptoms are prominent features of clinical syndromes such as migraine, cluster headache, and the trigeminal autonomic cephalgias. There are also strong links between headache and the visual system on the basis of genetics, molecular biology, neurophysiology, and neuroimaging. Studies of these links are leading to the development of novel therapies for a variety of headache syndromes. This review is designed to summarize the most recent literature on headache and the visual system. A particular emphasis is placed on publications of interest to clinicians.

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Section: Descriptionmentioning

confidence: 86%

Visual disturbances and migraine

Maxner

Moeller

2005

Curr Neurol Neurosci Rep

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“…Previous VEP studies have yielded conflicting results in groups of migraine with aura (MwA) patients without phenotype distinction. In some reports the grand-average of VEP N1–P1 and/or P1–N2 amplitudes was found greater in MwA patients than in controls [ 30 – 35 ] and/or in migraine without aura (MO) patients [ 31 , 36 , 37 ]. The amplitude of steady-state VEP harmonics was also larger in MwA than in MO or HV [ 38 ].…”

Section: Discussionmentioning

confidence: 99%

Visual evoked potentials in subgroups of migraine with aura patients

et al. 2015

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BackgroundPatients suffering from migraine with aura can have either pure visual auras or complex auras with sensory disturbances and dysphasia, or both. Few studies have searched for possible pathophysiological differences between these two subgroups of patients.MethodsMethods - Forty-seven migraine with aura patients were subdivided in a subgroup with exclusively visual auras (MA, N = 27) and another with complex neurological auras (MA+, N = 20). We recorded pattern-reversal visual evoked potentials (VEP: 15 min of arc cheques, 3.1 reversal per second, 600 sweeps) and measured amplitude and habituation (slope of the linear regression line of amplitude changes from the 1st to 6th block of 100 sweeps) for the N1-P1 and P1-N2 components in patients and, for comparison, in 30 healthy volunteers (HV) of similar age and gender distribution.ResultsVEP N1-P1 habituation, i.e. amplitude decrement between 1st and 6th block, which was obvious in most HV (mean slope −0.50), was deficient in both MA (slope +0.01, p = 0.0001) and MA+ (−0.0049, p = 0.001) patients. However, VEP N1-P1 amplitudes across blocks were normal in MA patients, while they were significantly greater in MA+ patients than in HVs.ConclusionsOur findings suggest that in migraine with aura patients different aura phenotypes may be underpinned by different pathophysiological mechanisms. Pre-activation cortical excitability could be higher in patients with complex neurological auras than in those having pure visual auras or in healthy volunteers.

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“…In our study, we found a reduced perception of blue in MO patients. Although a visual cortex dysfunction might be responsible for this reduced perception of blue, previous observations demonstrating that the occipital cortex is involved to a far greater degree in MA than in MO challenge this interpretation 38–40 . Other authors have observed a reduced perception of blue in migraine patients studied between attacks.…”

Section: Commentsmentioning

confidence: 96%

“…Although a visual cortex dysfunction might be responsible for this reduced perception of blue, previous observations demonstrating that the occipital cortex is involved to a far greater degree in MA than in MO challenge this interpretation. [38][39][40] Other authors have observed a reduced perception of blue in migraine patients studied between attacks. Although this abnormality is presumed not to involve cortical regions, its underlying cause remains unclear.…”

Section: Commentsmentioning

confidence: 99%

Impairment in Color Perception in Migraine With and Without Aura

Marinis¹,

Rinalduzzi²,

Accornero³

2007

Headache

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The impairment in visual perception of red, which was more marked in MA than in MO patients, may be related to the degree of photophobia recorded before testing. The reduced perception of blue, which only occurred in a subgroup of MO patients in the premonitory phase of the migraine attack, probably occurs through mechanisms that involve dopaminergic function. We cannot exclude the possibility that the visual stimulations induced the migraine attack in this subgroup of MO patients shortly after they were tested.

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Vector analysis of visual evoked potentials in migraineurs with visual aura

Cited by 17 publications

References 16 publications

Visual disturbances and migraine

Visual disturbances and migraine

Visual evoked potentials in subgroups of migraine with aura patients

Impairment in Color Perception in Migraine With and Without Aura

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