Publications by authors named "Tissieres P"

Dysregulation of the renin-angiotensin-aldosterone-system (RAAS) in sepsis is a complex and early phenomenon with a likely significant contribution to organ failure and patient outcomes. A better understanding of the pathophysiology and intricacies of the RAAS in septic shock has led to the use of exogenous angiotensin II as a new therapeutic agent. In this review, we report a multinational and multi-disciplinary expert panel discussion on the role and implications of RAAS modulation in sepsis and the use of exogenous angiotensin II.

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Severe febrile illnesses in children encompass life-threatening organ dysfunction caused by diverse pathogens and other severe inflammatory syndromes. A comparative approach to these illnesses may identify shared and distinct features of host immune dysfunction amenable to immunomodulation. Here, using immunophenotyping with mass cytometry and cell stimulation experiments, we illustrate trajectories of immune dysfunction in 74 children with multi-system inflammatory syndrome in children (MIS-C) associated with SARS-CoV-2, 30 with bacterial infection, 16 with viral infection, 8 with Kawasaki disease, and 42 controls.

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Article Synopsis
  • Sepsis involves a dysregulated immune response driven by interactions between pathogens and the body's damaged cells, activating pattern recognition receptors that lead to organ failure.
  • Pancreatic stone protein (PSP) is identified as a significant biomarker for sepsis, with studies indicating it worsens sepsis severity and correlates with increased mortality and organ dysfunction.
  • Research suggests PSP may play a role in activating innate immunity through C-type lectin receptors, highlighting its potential as both a diagnostic marker and a therapeutic target in sepsis treatment.
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Background And Objectives: Manual blood exchange (MBE) is a leukoreduction therapy for hyperleukocytosis in Bordetella spp.

Infection: We describe the impact of BE on clinical and biological parameters in critically ill children with malignant pertussis.

Materials And Methods: This is a monocentric retrospective review of patients with malignant pertussis infection treated with MBE.

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  • Regulatory T cells (Treg) are crucial for managing immune responses in newborns, especially regarding tolerance to maternal antigens and fighting infections at birth.
  • This study, focusing on newborns in West Africa, found that neonates with early-onset sepsis (EOS) had reduced Treg frequency and expression of the Foxp3 marker compared to healthy newborns with prenatal risk factors, indicating a compromised immune profile.
  • The findings suggest that specific Treg markers like CTLA-4, PD-1, and CD39 could serve as potential early diagnostic indicators for EOS, as their expression correlates with the severity and outcome of the condition.
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  • The spatial structure of gut microbiota is vital for gut health, yet how these bacterial communities form in different areas remains unclear.
  • In insects, the anterior midgut has a diverse bacterial community, while the posterior midgut mostly hosts a single bacterial type that withstands antimicrobial peptides (AMPs) produced in that region.
  • Research identifies genetic pathways in these bacteria that help them resist AMPs, indicating that these defenses are essential for survival in the gut and may also play a role in interactions with the host.
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To characterize the neonatal hemodynamic profiles in recipients born after twin-to-twin transfusion syndrome (TTTS) treated with fetoscopic selective laser coagulation (FSLC). Retrospective analysis during the first month of life of recipient twins. Of the 480 newborns born during an 11-year period, 138 recipient twins with prenatal FSLC were classified into four groups: no hemodynamic impairment (NoHI, n = 102, 74%), isolated high blood pressure (HighBP, n = 18, 13%), right ventricular outflow tract obstruction (RVOTO, n = 10, 7%), and cardiac failure (CF, n = 8, 6%).

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  • Toxic shock syndrome (TSS) is a serious but rare illness that can lead to significant health problems, especially in children, and the study aimed to test the effectiveness and safety of intravenous immunoglobulin (IG) therapy compared to a control treatment in pediatric patients.
  • The study involved a randomized clinical trial with 28 participants aged 1 month to 18 years, assessing the feasibility of the trial based on inclusion rates, protocol compliance, and data completeness over a follow-up period of one year.
  • The results indicated that while the trial was feasible with a high inclusion rate and low missing data, there was no significant difference in clinical outcomes between the IG and control groups, although more adverse events were noted in the control group.
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  • The Society of Critical Care Medicine Pediatric Sepsis Definition Task Force worked on creating and validating new clinical criteria for identifying pediatric sepsis and septic shock, focusing on organ dysfunction metrics.
  • This research involved a large-scale international study across 10 healthcare systems, collecting data on nearly 3.6 million children over nine years to derive and test the new criteria.
  • The final scoring system, named the Phoenix Sepsis Score, was developed from a 4-organ-system model, demonstrating varying effectiveness in predicting mortality through different performance metrics during validation.
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Importance: Sepsis is a leading cause of death among children worldwide. Current pediatric-specific criteria for sepsis were published in 2005 based on expert opinion. In 2016, the Third International Consensus Definitions for Sepsis and Septic Shock (Sepsis-3) defined sepsis as life-threatening organ dysfunction caused by a dysregulated host response to infection, but it excluded children.

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Objectives: To identify research priorities in the management, epidemiology, outcome, and pathophysiology of sepsis and septic shock.

Design: Shortly after publication of the most recent Surviving Sepsis Campaign Guidelines, the Surviving Sepsis Research Committee, a multiprofessional group of 16 international experts representing the European Society of Intensive Care Medicine and the Society of Critical Care Medicine, convened virtually and iteratively developed the article and recommendations, which represents an update from the 2018 Surviving Sepsis Campaign Research Priorities.

Methods: Each task force member submitted five research questions on any sepsis-related subject.

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Article Synopsis
  • - A study was conducted to evaluate the safety and effectiveness of nirsevimab, a monoclonal antibody, in preventing hospitalizations due to respiratory syncytial virus (RSV) in healthy infants during their first RSV season.
  • - Infants aged 12 months or younger who were born at least 29 weeks gestation were randomly assigned to receive either nirsevimab or standard care, with results showing that 0.3% in the nirsevimab group were hospitalized compared to 1.5% in the standard-care group, indicating an 83.2% efficacy for nirsevimab.
  • - The study also found that severe cases of RSV were less common in the nirsevimab
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Background: Monocyte (m)HLA-DR expression appears to be a potent marker of immunosuppression in critically ill patients. The persistence of low mHLA-DR expression is associated with an increased risk of nosocomial infections and mortality. To adapt this measurement to pediatric requirements and provide extensive 24/7 access, we have developed a whole blood no-lyse no-wash micromethod (MM) and compared it with the standardized method (SM).

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Introduction: Sepsis is a life-threatening organ dysfunction caused by a dysregulated host response to infection. As such, circulating cytokines and danger- and pathogen-associated molecular patterns (such as endotoxins) are recognized as central in the pathogenesis of sepsis and organ dysfunction. Removing these compounds by extracorporeal blood filtration, commonly considered blood purification, may improve the septic patients' condition.

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  • - The respiratory syncytial virus (RSV) causes around 50,000 hospitalizations each season in children under 5 in France, especially affecting infants younger than 1 year old.
  • - There is a push for universal strategies to protect young children from RSV, which may involve maternal vaccination or administering monoclonal antibodies at birth, and later vaccinations.
  • - Successful implementation of these prevention methods will require strong collaboration between parents, healthcare providers, and public health authorities to ensure all children get the necessary protection at the start of RSV season.
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  • Few effective biomarkers for diagnosing neonatal sepsis exist, particularly in regions with high sepsis rates and limited resources, highlighting the need for exploring new host response biomarkers.
  • A multicentre study in Abomey-Calavi, South Benin, evaluated the accuracy of various transcriptional and proteic biomarkers alongside clinical characteristics in diagnosing and predicting outcomes of neonatal sepsis among 581 newborns.
  • The study found that while certain biomarkers like PCT, IL-6, and IP-10 were related to sepsis diagnosis, clinical criteria combinations were more effective, and CD74 was the most accurate biomarker for predicting mortality associated with neonatal sepsis.
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Background: This paper’s intent is to describe the neonatal hemodynamic characteristics of recipient twins of monochorionic pregnancies complicated with twin-to-twin transfusion syndrome (TTTS), born without prenatal fetoscopic selective laser coagulation (FSLC). Methods: Retrospective analysis of hemodynamic characteristics was performed during the first five days of life of recipient twins from untreated TTTS. Results: Forty-two recipient twins were included and divided into three groups: no hemodynamic impairment (NoHI) (n = 15, 36%), isolated high blood pressure (HighBP) (n = 12, 28%), and cardiac failure group (CF) (n = 15, 36%).

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Low monocyte (m)HLA-DR expression is associated with mortality in sepsis. G-286A∗rs3087456 polymorphism in promoter III of HLA class II transactivator (), the master regulator of HLA, has been associated with autoimmune diseases but its role in sepsis has never been demonstrated. In 203 patients in septic shock, GG genotype was associated with 28-day mortality and mHLA-DR remained low whereas it increased in patients with AA or AG genotype.

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We report a , cereulide producing strain, food poisoning of two sisters. After eating a few bites of pasta cooked 3 days earlier, a 13-year-old girl developed mild symptoms. However, her 11-year-old sister suffered, 40 h after ingestion of the entire platter, a multi-organ failure including acute liver failure, rhabdomyolysis, disseminated intravascular coagulation, and acute kidney injury (AKI).

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Background: Acute fulminant myocarditis in children is associated with elevated mortality and morbidity with few advances in its medical management. Here we report a preliminary experience of children treated with IL-1 receptor antagonist associated with rapid myocardial function recovery.

Methods: A retrospective case series of children admitted in the Pediatric Intensive Care Unit of the Bicêtre Hospital (AP-HP Paris Saclay University) between April 2020 and January 2022 with acute myocarditis.

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The genus Enterobacter includes species responsible for nosocomial outbreaks in fragile patients, especially in neonatal intensive care units (NICUs). Determining the primary source of infection is critical to outbreak management and patient outcomes. In this investigation, we report the management and control measures implemented during an Enterobacter outbreak of bloodstream infections in premature babies.

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Background And Objectives: Definitions for pediatric sepsis were established in 2005 without data-driven criteria. It is unknown whether the more recent adult Sepsis-3 definitions meet the needs of providers caring for children. We aimed to explore the use and applicability of criteria to diagnose sepsis and septic shock in children across the world.

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Unlabelled: Vancomycin is widely used in neonatal sepsis but proportion of newborn reaching recommended concentration is variable. Fluid status impact on vancomycin level remains understudied. We aimed to study fluid factors impacting vancomycin concentration at 24 h of treatment.

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