Innovative evaluation of visual field defects in epileptic patients after standard anterior temporal lobectomy, using partial field visual evoked potentials

Martín, Margarita Minou Báez; Téllez, Yamila del Carmen Pérez; Chacón, Lilia María Morales; Díaz, Bárbara Estupiñán; Trápaga-Quincoses, O; Maeso, Iván García; Bender, J.; Galvizu, Reynaldo; García, María Eugenia; Abreu, Ivette Cabrera; Rodríguez, Gladys Soto

doi:10.1016/j.eplepsyres.2010.03.009

Cited by 3 publications

(6 citation statements)

References 15 publications

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“…In summary, the highest values of P100 latency in the contralateral superior quadrant indicate probable myelin damage in the optic radiation, which is supported by neuroimaging studies of diffusion (tractography and connectivity) and in correspondence with the perimetric results [ 16 ]. All of these findings confirm the existence of a partial and selective dysfunction of the visual pathway, in particular of the optic radiations on the side of the temporal lobectomy, which is expressed as a superior homonymous quadrantanopia contralateral to the resection, which is imperceptible for most patients with epilepsy that are resistant to medication and subjected to this surgical procedure.…”

Section: Discussionsupporting

confidence: 55%

“…The density and strength of the connection between the regions of interest had a positive relationship with this variable, selectively for the O2 electrode (right occipital cortex), which seems to be congruent given that most of the patients that were included in the anatomical study of the tracts had resection of the anterior temporal lobe of the right side (6 of 8). Furthermore, subjects with the higher volume of resected tissue showed the most delayed latencies and the lowest P100 amplitude [ 16 ].…”

Section: Discussionmentioning

confidence: 99%

“…In previous papers, we studied the variations of auditory and visual evoked potentials in patients with temporal lobe epilepsy that were submitted to surgical resection of the epileptogenic area [ 15 , 16 ]. Auditory brainstem response, auditory middle latency response and partial field visual evoked potentials were evaluated in particular.…”

Section: Introductionmentioning

confidence: 99%

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Relation of Structural and Functional Changes in Auditory and Visual Pathways after Temporal Lobe Epilepsy Surgery

Báez-Martín

Chacón

García-Maeso

et al. 2018

Behavioral Sciences

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Auditory and visual pathways may be affected as a consequence of temporal lobe epilepsy surgery because of their anatomical relationships with this structure. The purpose of this paper is to correlate the results of the auditory and visual evoked responses with the parameters of tractography of the visual pathway, and with the state of connectivity between respective thalamic nuclei and primary cortices in both systems after the surgical resection of the epileptogenic zone in drug-resistant epileptic patients. Tractography of visual pathway and anatomical connectivity of auditory and visual thalamus-cortical radiations were evaluated in a sample of eight patients. In general, there was a positive relationship of middle latency response (MLR) latency and length of resection, while a negative correlation was found between MLR latency and the anatomical connection strength and anatomical connection probability of the auditory radiations. In the visual pathway, significant differences between sides were found with respect to the number and length of tracts, which was lower in the operated one. Anatomical connectivity variables and perimetry (visual field defect index) were particularly correlated with the latency of P100 wave which was obtained by quadrant stimulation. These results demonstrate an indirect functional modification of the auditory pathway and a direct traumatic lesion of the visual pathway after anterior temporal lobectomy in patients with drug resistant epilepsy.

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Section: Discussionsupporting

confidence: 55%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Relation of Structural and Functional Changes in Auditory and Visual Pathways after Temporal Lobe Epilepsy Surgery

Báez-Martín

Chacón

García-Maeso

et al. 2018

Behavioral Sciences

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“…These abnormalities can lead to intractable temporal lobe epilepsy requiring temporal lobectomy. Children who undergo temporal lobe surgery are at risk of superior quadrantanopia because of the protrusion of Meyers loop through the anterior temporal lobe [ 115 ].…”

Section: Quadrantanopiamentioning

confidence: 99%

“…Full and half-field pattern VEPs are known to be insensitive to picking up well-defined superior or inferior quadrantanopia in 0-40% [ 96 , 116 – 118 ] (Table 1 ). However, the pattern-reversal stimuli can be divided further to individually test the four quadrants increasing sensitivity [ 115 , 119 – 121 ] (Table 1 ). However, such stimuli might also fail to detect the abnormality where the upper quadrantic defects are incomplete, as shown in these two published cases [ 122 ].…”

Section: Quadrantanopiamentioning

confidence: 99%

What can visual electrophysiology tell about possible visual-field defects in paediatric patients

Handley

Šuštar

Pompe

2021

Eye

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Recognising a potential visual-field (VF) defect in paediatric patients might be challenging, especially in children before the age of 5 years and those with developmental delay or intellectual disability. Visual electrophysiological testing is an objective and non-invasive technique for evaluation of visual function in paediatric patients, which can characterise the location of dysfunction and differentiate between disorders of the retina, optic nerve and visual pathway. The recording of electroretinography (ERG) and visual-evoked potentials (VEP) is possible from early days of life and requires no subjective input from the patient. As the origins of ERG and VEP tests are known, the pattern of electrophysiological changes can provide information about the VF of a child unable to perform accurate perimetry. This review summarises previously published electrophysiological findings in several common types of VF defects that can be found in paediatric patients (generalised VF defect, peripheral VF loss, central scotoma, bi-temporal hemianopia, altitudinal VF defect, quadrantanopia and homonymous hemianopia). It also shares experience on using electrophysiological testing as additional functional evidence to other tests in the clinical challenge of diagnosing or excluding VF defects in complex paediatric patients. Each type of VF defect is illustrated with one or two clinical cases.

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Temporal lobe epilepsy surgery modulates the activity of auditory pathway

et al. 2014

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Innovative evaluation of visual field defects in epileptic patients after standard anterior temporal lobectomy, using partial field visual evoked potentials

Cited by 3 publications

References 15 publications

Relation of Structural and Functional Changes in Auditory and Visual Pathways after Temporal Lobe Epilepsy Surgery

Relation of Structural and Functional Changes in Auditory and Visual Pathways after Temporal Lobe Epilepsy Surgery

What can visual electrophysiology tell about possible visual-field defects in paediatric patients

Temporal lobe epilepsy surgery modulates the activity of auditory pathway

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