References of "JEDIDI, Zayd"
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See detailStuck between two Georges... a case of dystonia, subcortical dementia and facial myorythmia
JEDIDI, Zayd ULiege

Conference (2021, November 13)

We present an interesting case of entanglement between Whipple disease and Huntington's disease in a 37 years old mal of subsaharan origin without known family history.

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See detailMécanismes cérébraux du traitement incident de l'information sémantique
JEDIDI, Zayd ULiege

Doctoral thesis (2021)

Le réseau sémantique frontopariétal englobant le gyrus frontal inférieur (IFG) et le cortex médio-temporal postérieur (pMTG) est généralement considéré comme impliqué dans les processus de contrôle ... [more ▼]

Le réseau sémantique frontopariétal englobant le gyrus frontal inférieur (IFG) et le cortex médio-temporal postérieur (pMTG) est généralement considéré comme impliqué dans les processus de contrôle sémantique. La nature implicite versus explicite de ces mécanismes de contrôle demeure à ce jour toutefois largement méconnue. Ce travail expérimental a précisément étudié cette question en évaluant la réponse de régions particulières du cerveau vis-à-vis des attributs sémantiques d’un flux de mots présenté de manière détournée à des volontaires sains, alors que leurs ressources attentionnelles (détection visuelle, jugement, contrôle moteur, etc.) étaient monopolisées par une tâche complexe et exigeante basée sur la recherche visuelle. Le caractère spécifique de ces réponses par rapport au contenu sémantique du flux verbal a été établi par un paradigme incident de suppression par répétition en IRMf. Au cours de ce travail, nous avons mis en évidence le fait que le traitement sémantique incident d’une suite de mots passivement entendus a non seulement recruté les cortex unimodaux (‘spokes’) et amodaux (‘hubs’) dans les régions postérieures sous-tendant les connaissances sémantiques, mais également le cortex frontal inférieur et les régions postérieures du cortex médio-temporal considérées comme faisant partie du réseau de contrôle sémantique. Ces résultats soutiennent donc l’idée que le réseau sémantique fronto-temporal est impliqué dans un traitement (et un contrôle) sémantique incident. [less ▲]

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See detailIncidental Verbal Semantic Processing Recruits the Fronto-temporal Semantic Control Network
JEDIDI, Zayd ULiege; Manard, Marine ULiege; Balteau, Evelyne ULiege et al

in Cerebral Cortex (2021), 31

The frontoparietal semantic network, encompassing the inferior frontal gyrus and the posterior middle temporal cortex, is considered to be involved in semantic control processes. The explicit versus ... [more ▼]

The frontoparietal semantic network, encompassing the inferior frontal gyrus and the posterior middle temporal cortex, is considered to be involved in semantic control processes. The explicit versus implicit nature of these control processes remains however poorly understood. The present study examined this question by assessing regional brain responses to the semantic attributes of an unattended stream of auditory words while participants’ top–down attentional control processes were absorbed by a demanding visual search task. Response selectivity to semantic aspects of verbal stimuli was assessed via a functional magnetic resonance imaging response adaptation paradigm. We observed that implicit semantic processing of an unattended verbal stream recruited not only unimodal and amodal cortices in posterior supporting semantic knowledge areas, but also inferior frontal and posterior middle temporal areas considered to be part of the semantic control network. These results indicate that frontotemporal semantic networks support incidental semantic (control) processes. [less ▲]

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See detailLa vignette diagnostique de l’étudiant. Ataxie subaiguë et chutes chez une patiente de 62 ans
JEDIDI, Zayd ULiege; Moonen, Gustave ULiege; Bianchi, Elettra ULiege et al

in Revue Médicale de Liège (2020), 75(3), 190-198

ésumé : Nous discutons la démarche sémiologique et diagnostique d’un cas d’ataxie chez une patiente de 62 ans, indemne de tout antécédent médical significatif. A l’occasion de cette vignette diagnostique ... [more ▼]

ésumé : Nous discutons la démarche sémiologique et diagnostique d’un cas d’ataxie chez une patiente de 62 ans, indemne de tout antécédent médical significatif. A l’occasion de cette vignette diagnostique, nous insistons sur trois aspects : 1. La nécessité de contextualiser la démarche pour éviter d’évoquer des diagnostics différentiels irréalistes; 2. La nécessité de choisir les examens complémentaires pertinents en les hiérarchisant en fonction de la probabilité de contribuer au diagnostic, de leur invasivité et de leur disponibilité, y compris de leur coût et 3. Le caractère évolutif de la démarche diagnostique qu’il faut pouvoir remettre en question au fil des informations que fournissent l’évolution du patient et les résultats des investigations. [less ▲]

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See detailLes mouvements anormaux... de la personne âgée ?
JEDIDI, Zayd ULiege

Conference (2019, December 16)

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See detailMaladie de Huntington & Sexualité
JEDIDI, Zayd ULiege

Conference (2018, March 19)

La maladie de Huntington s'accompagne souvent d'une profonde altération des relations intimes et de la vie de couple. Nous abordons ici la manière d'aborder la problématique avec les patients et leurs ... [more ▼]

La maladie de Huntington s'accompagne souvent d'une profonde altération des relations intimes et de la vie de couple. Nous abordons ici la manière d'aborder la problématique avec les patients et leurs familles, les mécanismes à l’œuvre et les pistes à explorer pour y faire face. [less ▲]

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See detailLa Maladie de Huntington... un survol
JEDIDI, Zayd ULiege

Conference (2018)

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See detailSéquelles Neurologiques - Epilepsie - Guillain-Barré - Myasthénie
JEDIDI, Zayd ULiege

Conference (2016, February 17)

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See detailL'image du mois. L'encéphalopathie postérieure réversible.
COUSIN, François ULiege; JEDIDI, Zayd ULiege; OTTO, Bernard ULiege et al

in Revue Médicale de Liège (2016), 71(11)

Nous rapportons ici le cas d'une patiente de 32 ans, sans antécédents, ayant présenté une encéphalopathie postérieure réversible toxique sur prise d'Antabuse.

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See detailUrgences Neurologiques
JEDIDI, Haroun ULiege; JEDIDI, Zayd ULiege

Conference given outside the academic context (2015)

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See detailLa pollution lumineuse, entre écologie et santé
JEDIDI, Haroun ULiege; DEPIERREUX, Frédérique ULiege; JEDIDI, Zayd ULiege et al

in Revue Médicale de Liège (2015), 70(11), 557-562

Light pollution is defined as the abnormal and disturbing presence of light and its adverse consequences on flora, faunae, ecosystems and its suspected or proven effects on human health. Light pollution ... [more ▼]

Light pollution is defined as the abnormal and disturbing presence of light and its adverse consequences on flora, faunae, ecosystems and its suspected or proven effects on human health. Light pollution is a quite recent and increasing phenomenon within our society and it leads to a major environmental damage, obviously near wildlife, but also on human health (cancers, obesity, fatigue, depression...). The solutions to this problem are however simple, efficient and de facto inexpensive and involving a substantial energy saving. [less ▲]

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See detailUne histoire d'hypophyse, évolution des représentations et des concepts au cours du temps.
JEDIDI, Haroun ULiege; JEDIDI, Zayd ULiege; BECKERS, Albert ULiege

in Revue Médicale de Liège (2014)

De par le rôle essentiel qu’il occupe, l’axe hypothalamo-hypophysaire, véritable chef d’orchestre du système endocrinien, constitue au niveau médical un important pourvoyeur de désordres. Il est assez ... [more ▼]

De par le rôle essentiel qu’il occupe, l’axe hypothalamo-hypophysaire, véritable chef d’orchestre du système endocrinien, constitue au niveau médical un important pourvoyeur de désordres. Il est assez paradoxal de constater que malgré l’importance de ce système, celui-ci ait été presque complètement méconnu par les physiologistes des siècles passés. En nous basant sur les conceptions physiologiques des médecins philosophes de l’antiquité puis du moyen-âge et de la renaissance nous tenterons de comprendre pourquoi le rôle de l’hypophyse a été si longtemps méconnu. [less ▲]

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See detailDéfis éthiques dans la pratique quotidienne, réflexions d'un assistant.
JEDIDI, Haroun ULiege; JEDIDI, Zayd ULiege

Conference given outside the academic context (2013)

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See detailFunctional neuroimaging of human REM sleep
Meyer, Christelle ULiege; JEDIDI, Zayd ULiege; Muto, Vincenzo ULiege et al

in Nofzinger, Eric; Maquet, Pierre; Thorpy, Michael J. (Eds.) Neuroimaging of sleep and sleep disorders (2013)

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See detailL’image du mois: Pli fessier anormal révélant un syndrome de Currarino.
JEDIDI, Zayd ULiege; Moonen, Gustave ULiege

in Revue Médicale de Liège (2012), 67(10)

We briefly report the case of a man carrying an abnormal intergluteal cleft as an isolated manifestation of Currarino's syndrome.

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See detailElectrophysiological investigations of brain function in coma, vegetative and minimally conscious patients.
Lehembre, Remy ULiege; Gosseries, Olivia ULiege; Lugo, Zulay et al

in Archives Italiennes de Biologie (2012), 150(2-3), 122-39

Electroencephalographic activity in the context of disorders of consciousness is a swiss knife like tool that can evaluate different aspects of cognitive residual function, detect consciousness and ... [more ▼]

Electroencephalographic activity in the context of disorders of consciousness is a swiss knife like tool that can evaluate different aspects of cognitive residual function, detect consciousness and provide a mean to communicate with the outside world without using muscular channels. Standard recordings in the neurological department offer a first global view of the electrogenesis of a patient and can spot abnormal epileptiform activity and therefore guide treatment. Although visual patterns have a prognosis value, they are not sufficient to provide a diagnosis between vegetative state/unresponsive wakefulness syndrome (VS/UWS) and minimally conscious state (MCS) patients. Quantitative electroencephalography (qEEG) processes the data and retrieves features, not visible on the raw traces, which can then be classified. Current results using qEEG show that MCS can be differentiated from VS/UWS patients at the group level. Event Related Potentials (ERP) are triggered by varying stimuli and reflect the time course of information processing related to the stimuli from low-level peripheral receptive structures to high-order associative cortices. It is hence possible to assess auditory, visual, or emotive pathways. Different stimuli elicit positive or negative components with different time signatures. The presence of these components when observed in passive paradigms is usually a sign of good prognosis but it cannot differentiate VS/UWS and MCS patients. Recently, researchers have developed active paradigms showing that the amplitude of the component is modulated when the subject's attention is focused on a task during stimulus presentation. Hence significant differences between ERPs of a patient in a passive compared to an active paradigm can be a proof of consciousness. An EEG-based brain-computer interface (BCI) can then be tested to provide the patient with a communication tool. BCIs have considerably improved the past two decades. However they are not easily adaptable to comatose patients as they can have visual or auditory impairments or different lesions affecting their EEG signal. Future progress will require large databases of resting state-EEG and ERPs experiment of patients of different etiologies. This will allow the identification of specific patterns related to the diagnostic of consciousness. Standardized procedures in the use of BCIs will also be needed to find the most suited technique for each individual patient. [less ▲]

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See detailLa vignette diagnostique de l'étudiant. La paralysie faciale ... pas toujours si facile que cela !
JEDIDI, Zayd ULiege; Sadzot, Bernard ULiege

in Revue Médicale de Liège (2011), 66(11)

We report the case of a 45 years old woman who experienced two episodes of facial palsy, first on the left side, then on the other. this particular case allows us to discuss the diagnostic process and ... [more ▼]

We report the case of a 45 years old woman who experienced two episodes of facial palsy, first on the left side, then on the other. this particular case allows us to discuss the diagnostic process and clinical reasoning to follow in front of this symptomatology -using a didactic questioning- and to briefly review the anatomy of the seventh cranial nerve. treatment and possible complications are also discussed [less ▲]

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See detailRadiation-induced malignant peripheral nerve sheat tumors – a report of 2 cases
PHAN BA, Remy ULiege; BELACHEW, Shibeshih ULiege; JEDIDI, Zayd ULiege et al

Poster (2011, May)

We discuss the case of two patients who developped delayed malignant peripheral nerve sheath tumor (MPNST) following radiotherapy. Case report: the first patient is a sixty year-old woman with a 2 years ... [more ▼]

We discuss the case of two patients who developped delayed malignant peripheral nerve sheath tumor (MPNST) following radiotherapy. Case report: the first patient is a sixty year-old woman with a 2 years history of right cervicobrachial pain and weakness. The neurological examination depicted severe weakness, atrophy and loss of sensation in the right C5 and C6 territories. A subclavicular hardened and enlarged lymph node was noted. Her past medical history was notable for a Hodgkin’s disease (HD) treated with radiation therapy (>40Gy) 35 years earlier. Brachial plexus MRI revealed a tumoral mass arising from the right brachial plexus. Biopsy of the subclavicular mass revealed a poorly differentiated malignant tumour consisting of spindle cells showing moderate polymorphism and a high mitotic index. Immunohistochemistry showed positivity for the S-100 protein, the CD56 and for the epithelial membrane antigen (EMA) and a diagnosis of MPNST of the brachial plexus was proposed. The second case is a 36 year-old man referred for a history of right sciatic neuralgia that appeared 3 years earlier. The medical history of the patient was notable for a right seminoma, treated by orchidectomy and prophylactic radiotherapy (24 Gy) 5 years earlier. The neurologic examination revealed right L5 and S1 radicular territories involvement, and the CT of the pelvis demonstrated a nodular mass at the level of the greater sciatic foramen. A surgical biopsy was performed and the neuropathological findings were consistent with a diagnosis of low-grade MPSNT. Discussion: MPNSTs are rare tumors accounting for 3 to 10% of all tissues sarcomas. Half of the cases described are sporadic, while the other half tend to appear in patients suffering from tumor prone conditions, such as neurofibromatosis type 1. Although secondary neoplasms are known complications of radiotherapy, descriptions of peripheral nerve sheath tumors (PNST) are scarce. The exact pathophysiology of radiation-induced PNSTs remains unclear but vascular alterations, direct damages to axon or Schwann cell and nerve compression by soft tissue fibrosis are thought to play a role. Although surgical removal sometimes followed by chemotherapy is the mainstay of MPNSTs, they usually carry a poor prognosis. Our 2 cases emphasize that the possibility of radiation-induced MPNST has to be kept in mind when investigating a localized neuropathy in a previously irradiated area. [less ▲]

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See detailFunctional neuroimaging of the reciprocal influences between sleep and wakefulness.
JEDIDI, Zayd ULiege; Rikir, Estelle ULiege; Muto, Vincenzo ULiege et al

in Pflügers Archiv: European Journal of Physiology (2011), 463(1), 103-9

The activity patterns adopted by brain neuronal populations differ dramatically between wakefulness and sleep. However, these vigilance states are not independent and they reciprocally interact. Here, we ... [more ▼]

The activity patterns adopted by brain neuronal populations differ dramatically between wakefulness and sleep. However, these vigilance states are not independent and they reciprocally interact. Here, we provide evidence that in humans, regional brain activity during wakefulness is influenced by sleep regulation, namely by the interaction between sleep homeostasis and circadian signals. We also show that, by contrast, regional brain activity during sleep is influenced by the experience acquired during the preceding waking period. These data reveal the dynamic interactions by which the succession of vigilance states support normal brain function and human cognition. [less ▲]

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