Publications by authors named "Christophe Demattei"

The objective of this study was to investigate the link between gut microbiota (GM) dysbiosis, gut inflammation, and bacterial translocation (BT) in recently diagnosed rheumatoid arthritis (RA). This case-control, observational study prospectively recruited recently diagnosed (<12 months) RA patients and age-matched healthy controls (HC) from two French hospitals between July 2014 to March 2018. The primary objective was to investigate GM composition in each group using 16S rRNA sequencing and metaproteomics approaches.

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: Vascular aging is associated with increased arterial stiffness and changes in the wall structure, leading to a loss of elasticity. Silicon is abundant in arteries and plays a key role in the synthesis and stabilization of elastin fibers. In animal models of accelerated cardiovascular aging, a specific nutritional supplement based on silicon-enriched spirulina (SpSi) has been shown to have beneficial effects on vascular function.

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  • Vitamin D deficiency is linked to multiple sclerosis (MS), and while studies show mixed results on supplementation, this trial seeks to determine the effectiveness of high-dose cholecalciferol as solo treatment in patients with clinically isolated syndrome (CIS) typical for MS.
  • The D-Lay MS trial, conducted in France, randomized 316 participants aged 18-55 with low vitamin D levels to receive either high-dose cholecalciferol or a placebo over 24 months, tracking disease activity through relapses and MRI results.
  • Results indicated that disease activity occurred in 60.3% of the vitamin D group compared to 74.1% in the placebo group, suggesting that vitamin D supplementation significantly
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Background: There is inconsistent evidence suggesting that people with chronic low back pain may differ in variability of repeated trunk movements compared to people without chronic low back pain. These inconsistencies may be due to low reliability and task dependence of movement variability measures, which can be addressed using multiple movement tasks and summary measures.

Methods: Participants with and without chronic low back pain were recruited.

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  • The study examined the effectiveness of serum neutrophil gelatinase-associated lipocalin (NGAL) as an early biomarker for predicting acute kidney injury (AKI) in patients with rhabdomyolysis who visited emergency departments in France.
  • Conducted across five adult EDs, the research included 197 patients with high creatine phosphokinase levels, assessing NGAL levels upon admission and evaluating its correlation with AKI development within 48 hours.
  • Out of those studied, 29% developed AKI by day two, with NGAL showing moderate predictive ability, indicated by an area under the receiver operating characteristic curve (AUC-ROC) of 0.60, meaning further refinement and research are needed
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  • Recent clinical trials show that using a prophylactic mesh does not significantly lower the rate of parastomal hernias, and there's limited data on its effects on symptoms and quality of life.
  • The study aimed to analyze whether the type of mesh used (or lack thereof) affected symptoms and complications in patients with parastomal hernias from the GRECCAR 7 trial.
  • Results indicated no significant difference in parastomal hernia diagnosis or symptoms between the mesh and non-mesh groups after two years, but the study was limited by a small sample size and incomplete data.
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  • A scientific expert committee reanalyzed suspected clusters of transverse upper limb reduction defects (TULRD) in France from 2019-2021, addressing public health concerns despite no initial risk exposure findings.
  • Methods included reviewing medical records, conducting spatiotemporal analyses for statistical significance, and examining environmental exposures through questionnaires and surveys.
  • Results showed no significant clusters in one area, a small cluster in another without identifiable risk factors, and only two cases in a third area, emphasizing the need for a standardized approach in managing similar health concerns.
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Background And Objectives: The aim of this study was to identify novel biomarkers for multiple sclerosis (MS) diagnosis and prognosis, addressing the critical need for specific and prognostically valuable markers in the field.

Methods: We conducted an extensive proteomic investigation, combining analysis of (1) CSF proteome from symptomatic controls, fast and slow converters after clinically isolated syndromes, and patients with relapsing-remitting MS (n = 10 per group) using label-free quantitative proteomics and (2) oligodendrocyte secretome changes under proinflammatory or proapoptotic conditions using stable isotope labeling by amino acids in cell culture. Proteins exhibiting differential abundance in both proteomic analyses were combined with other putative MS biomarkers, yielding a comprehensive list of 87 proteins that underwent quantification through parallel reaction monitoring (PRM) in a novel cohort, comprising symptomatic controls, inflammatory neurologic disease controls, and patients with MS at various disease stages (n = 10 per group).

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Objective: This study aimed to evaluate the number and risk factors of violent events encountered in the emergency department. An observation grid was developed following interviews with emergency department staff to target the most pertinent information to collect in a prospective study design.

Design: Observational study.

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Background And Objectives: To evaluate the predictive value of serum neurofilament light chain (sNfL) and CSF NfL (cNfL) in patients with radiologically isolated syndrome (RIS) for evidence of disease activity (EDA) and clinical conversion (CC).

Methods: sNfL and cNfL were measured at RIS diagnosis by single-molecule array (Simoa). The risk of EDA and CC according to sNfL and cNfL was evaluated using the Kaplan-Meier analysis and multivariate Cox regression models including age, spinal cord (SC) or infratentorial lesions, oligoclonal bands, CSF chitinase 3-like protein 1, and CSF white blood cells.

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Background: This prospective multicentre pilot study of patients scheduled for elective major abdominal surgery aimed to validate the fluid challenge (FC) proposed by the closed-loop (CL) system via anaesthesiologist assessment. Methods: This was a phase II trial consisting of two inclusion stages (SIMON method). Each FC (250 mL saline solution for 10 min) proposed by the CL was systematically validated by the anaesthesiologist who could either confirm or refuse the FC or give FC without the CL system.

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Background: Although wisdom-tooth extraction is a routine intervention, the postoperative period remains marked by local inflammation classically manifesting as pain, edema and trismus. Furthermore, there is no consensus on the best operative techniques, particularly for the mucosal closure stage on impacted mandibular wisdom teeth.

Methods: This parallel, randomized, non-blinded study compared pain following removal of impacted third molars, with and without sutures.

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Study Design: A prospective study of healthy volunteers.

Objectives: The influence of the sagittal alignment of the spine and its influence on the extension reserve have been reported in the literature. However, specific analysis of the intrinsic coxofemoral and extrinsic pelvic component in subjects without any spinal or hip pathologies remains poorly reported.

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  • The study investigates the role of soluble CD146 (sCD146) and its interaction with galectin-1 (Gal1) in pregnancy complications, particularly focusing on placenta-related issues.
  • Researchers conducted experiments involving 115 women divided into healthy, normal pregnancy, and pregnancy complication groups to analyze trophoblast migration and measure levels of sCD146 and Gal1.
  • Results indicated that lower sCD146 and higher Gal1 levels are present in normal pregnancies, while elevated sCD146 in preeclampsia patients suggests that sCD146 could serve as a biomarker and a possible therapeutic target for such complications.
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Introduction: Although arterial hypertension is a major concern in patients with chronic kidney disease (CKD), obtaining accurate systolic blood pressure (SBP) measurement is challenging in this population for whom automatic oscillometric devices may yield erroneous results.

Methods: This cross-sectional study was conducted in 89 patients with stages 4, 5, and 5D CKD, for whom we compared SBP values obtained by the recently described systolic foot-to-apex time interval (SFATI) technique which provides direct SBP determination, the standard technique (Korotkoff sounds), and oscillometry. We investigated the effects of age, sex, diabetes, CKD stage, and pulse pressure to explain measurement errors defined as biases or misclassification relative to the SBP thresholds of 110-130-mm Hg.

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Bacterial species and their role in delaying the healing of pressure ulcers (PU) in spinal cord injury (SCI) patients have not been well described. This pilot study aimed to characterise the evolution of the cutaneous microbiota of PU in SCI cohort. Twenty-four patients with SCI from a French neurological rehabilitation centre were prospectively included.

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  • Early gestational diabetes mellitus (eGDM) is diagnosed before 24 weeks of pregnancy, while standard GDM is diagnosed between 24 and 28 weeks using an oral glucose tolerance test; eGDM is associated with worse obstetric outcomes.
  • A study compared postpartum glucose metabolism disorders in 500 women with eGDM (Group 1) and standard GDM (Group 2), revealing that eGDM patients required more insulin during pregnancy but had fewer preterm labors and fetal complications.
  • Despite differences in treatment and outcomes during pregnancy, the rates of postpartum glucose metabolism disorders were similar between the two groups, indicating a high frequency of these disorders in both categories.
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Objective: To determine the effects of graduated and progressive elastic compression stockings (ECS) on postural diameter changes and viscoelasticity of leg veins in healthy controls and in limbs with chronic venous disease (CVD).

Methods: In 57 patients whose legs presented with C, C, or C CEAP classes of chronic venous disease and were treated primarily with compression, and 54 healthy controls matched for age and body mass index, we recorded interface pressures (IFP) at 9 reference leg levels. Cross-sectional areas of the small saphenous vein (SSV) and a deep calf vein (DCV) were measured with B-mode ultrasound with patients supine and standing, recording the force (PF) applied on the ultrasound probe to collapse each vein with progressive ECS, and with and without graduated 15 to 20 mm Hg and 20 to 36 mm Hg elastic stockings.

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NETosis is an innate immune response occurring after infection or inflammation: activated neutrophils expel decondensed DNA in complex with histones into the extracellular environment in a controlled manner. It activates coagulation and fuels the risk of thrombosis. Human pregnancy is associated with a mild proinflammatory state characterized by circulatory neutrophil activation which is further increased in complicated pregnancies, placenta-mediated complications being associated with an increased thrombotic risk.

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Objective: The noninvasive measurement of venous wall deformation induced by changes in transmural pressure could allow for the assessment of viscoelasticity and differentiating normal from diseased veins.

Methods: In 57 patients with limbs in the C1s (telangiectasia or reticular veins and symptoms), C3 (edema), or C5 (healed venous ulcer) CEAP (clinical, etiologic, anatomic, pathophysiologic) category of chronic venous disease and 54 matched healthy controls, we measured the changes in the cross-sectional area of the small saphenous vein and a deep calf vein in the supine and standing positions and under compression with an ultrasound probe using ultrasonography.

Results: The small saphenous vein, but not the deep calf vein, cross-sectional area was smaller in the limbs of the controls than in the limbs with C3 or C5 disease but was not different from that in C1s limbs.

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