Publications by authors named "Cheval M"

Article Synopsis
  • The study aimed to analyze the patterns of scalp EEG during occipital seizures (OS) and how they relate to simultaneous intracerebral EEG readings.
  • Researchers monitored 8 patients with confirmed OS, observing different seizure patterns including background activity suppression and high amplitude slow waves, with varied initial presentations across different regions of the brain.
  • The findings indicate that while scalp EEG can effectively pinpoint the onset of intracerebral seizures and carry lateralizing value, it does not always correlate with occipital electrode activity, emphasizing the complexity of seizure manifestations and aiding in better surgical planning for epilepsy treatment.
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Article Synopsis
  • - This study investigated the prevalence of clinical signs associated with functional neurological disorders (FNDs) in patients with probable functional dissociative seizures (FDS) compared to those with epilepsy.
  • - Results showed that 79% of the FDS patients exhibited at least one sign of FND, significantly higher than the 16.6% found in epileptic patients, with many FDS patients showing multiple signs.
  • - The findings highlight the importance of recognizing FND signs during neurologic examinations for better differentiation between FDS and epileptic seizures.
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Multiple hypotheses exist about the pathophysiology of Postictal Psychosis (PIP). As the clinical manifestations of PIP are roughly stereotyped, we assumed the existence of a common neurological pathway. This study aimed to determine if a specific brain network sustained the psychotic episode, regardless of the localization of the epileptogenic zone.

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Introduction: The choice of medical specialization is influenced by various factors, including personal, educational, and interpersonal aspects. However, stereotypes and social representations (SRs) can also play a significant role in biasing the choice of a particular medical specialty. The aim of this study is to describe and understand the social representation (SR) of French Neurologist among medical peers, and factors explaining stereotypes about neurology.

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Background And Objectives: Translocator protein 18 kDa (TSPO) PET imaging is used to monitor glial activation. Recent studies have proposed TSPO PET as a marker of the epileptogenic zone (EZ) in drug-resistant focal epilepsy (DRFE). This study aims to assess the contributions of TSPO imaging using [F]DPA-714 PET and [F]FDG PET for localizing the EZ during presurgical assessment of DRFE, when phase 1 presurgical assessment does not provide enough information.

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Purpose: Despite sharing the same staging system as oral cavity cancers, upper gingiva and hard palate (UGHP) squamous cell carcinoma (SCC) have several features that make them a different entity. We aimed to analyze oncological outcomes and adverse prognostic factors of UGHP SCC, and assess an alternate T classification specific to UGHP SCC.

Methods: Retrospective bicentric study including all patients treated by surgery for a UGHP SCC between 2006 and 2021.

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Background: Mesial temporal lobe epilepsy with hippocampal sclerosis (MTLE-HS) is usually associated with a poor response to antiseizure medications. We focused on MTLE-HS patients who were seizure free on medication to: (1) determine the clinical factors associated with seizure freedom and (2) develop a machine-learning classifier to better earlier identify those patients.

Methods: We performed a retrospective, multicentric study comparing 64 medically treated seizure-free MTLE-HS patients with 200 surgically treated drug-resistant MTLE-HS patients.

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Issue: To define the relevance of online courses for neurology residents in a post-COVID environment and how to improve existing programs.

Evidence: In total, 99 French neurology residents voluntarily chose to participate in this survey. They were asked about the proportion of online courses they followed before and during the pandemic, the advantages and inconveniences of each format, the type of environment in which they attended online classes, and their preference for either online or in-person learning.

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Background: Occipital lobe seizure are underrepresented in epilepsy surgery cases series. This may reflect the fear for post-surgical functional deficits but also the doubt about the ability of anatomo-electro-clinical correlations to localize precisely the epileptogenic zone in occipital lobe seizure.

Methods: In this expert opinion paper, we review first the general clinical characteristics of occipital lobe seizures, describe the repertoire of visual phenomena and oculo-motor signes in occipital seizures, describe inter-ictal and ictal EEG and finally the possible schemes of epileptogenic zone organization.

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Treatment of symptomatic impacted and palpable submandibular lithiasis generally involves a combined transoral and sialendoscopic approach with an excellent success rate, and a low morbidity. Nevertheless, the approach of proximal or hilar lithiasis may in some cases represent a real challenge and cause major surgical discomfort, which could increase the risk of damage to the lingual nerve. This article details the surgical technique and advantages of submandibular lithiasis removal by transoral robotic surgery combined with sialendoscopy, together with a case video.

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Background: The management of bone exposure in patients with extensive burns could be a challenge due to the lack of healthy tissue. In such cases, it could be interesting to use any still healthy tissue initially destined for amputation and use it to cover up another site. We present the case of a sever burn patient for whom we used the only healthy palmar hand skin to cover an olecranon exposure.

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New Findings: What is the central question of this study? The beneficial effects of supplemental oxygen in patients with acute myocardial infarction are still uncertain: what are the effects of ischaemia-reperfusion injury during hyperoxia and normoxia in mature rats with and without cardiovascular risk factors? What is the main finding and its importance? Despite elevated baseline oxidative stress in rodents with cardiovascular risk factors, hyperoxic reperfusion limited myocardial necrosis and anti/pro-oxidant imbalance in spontaneously hypertensive and Zucker rats. In contrast, this effect was exacerbated in healthy Wistar rats. These results suggest that oxygen supplementation may not be harmful in patients with acute myocardial injury.

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Through a report of 4 late-onset cases with mitochondrial DNA (mtDNA) depletion, we address the specificity of the clinical entities associated with a very low residual amount of mtDNA. Three of the patients met the diagnostic criteria of Kearns Sayre syndrome, which has never been associated with mtDNA depletion. The fourth patient had an isolated skeletal myopathy.

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We report a family with an X-linked recessive muscular dystrophy characterised by exercise-induced myalgia, recurrent pigmenturia and mild proximal muscle involvement. Immunocytochemical and immunoblotting analysis in muscle, using the antibody directed against the rod domain of dystrophin, revealed a loss of immunoreactivity, but the immunolabelling using the antibodies directed against the COOH and NH2 domains of dystrophin were almost normal. The immunoreactions for alpha-sarcoglycan, gamma-sarcoglycan and beta-dystroglycan were normal.

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This paper underscores the contribution of routine morphological examination of skeletal muscle in patients with lactic acidosis. Mitochondrial disorders are by far the most common causes of primary lactic acidosis, in which muscle biopsy analysis helps in diagnosis and in the search for the molecular anomalies. Thus, we focus our attention on one particular point: the contribution of the morphological study of muscle biopsy in primary lactic acidosis due to mitochondrial disorders, especially mitochondrial respiratory-chain diseases.

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We report 8 cases of severe cytochrome c oxidase deficiency with onset in the neonatal period. Clinical symptoms were heterogeneous: antenatal cerebral malformations, neurological distress with ketoacidosis, severe myopathy, or isolated respiratory control failure. Lactic acid was elevated in blood and/or CSF in 7 cases.

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Despite the demonstration of a clear biochemical defect, the genetic alterations causing childhood forms of cytochrome c oxidase (COX) deficiency remain unknown. The double genetic origin (nuclear and mitochondrial DNA), and the complexity of COX enzyme structure and regulation, indicate the need for genetic investigations of the molecular structure of individual COX subunits. In the present study a new monoclonal antibody, which reacts exclusively with heart-type human COX subunit VIIa (VIIa-H), and other monoclonal antibodies against human COX subunits, were used in the immunohistochemical analysis of skeletal muscle from children with different forms of mitochondrial myopathy with COX deficiency.

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We report two families both presenting with malignant hyperthermia susceptibility and "core" or "core-like" changes in the muscle tissue. Combined analysis of the malignant hyperthermia phenotype and the histochemical findings demonstrates the complexity of their association and highly suggests genetic heterogeneity of malignant hyperthermia and central core diseases.

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