Daily Sepsis Research Analysis
Analyzed 11 papers and selected 3 impactful papers.
Summary
Three studies advance sepsis science and care: a preclinical study identifies HSP47 as a target linking platelet activation to NET-driven coagulopathy and improved survival with Col003; a large ICU cohort shows Staphylococcus aureus bloodstream infection independently increases early delirium risk; and a prospective neonatal study from Indonesia reveals high, early MDRO colonization—especially among outborn infants—highlighting prevention priorities.
Research Themes
- Mechanisms and therapeutic targeting of sepsis-associated coagulopathy
- Pathogen-specific neurologic complications in sepsis (delirium risk with S. aureus)
- AMR colonization dynamics and infection prevention in high-risk neonates
Selected Articles
1. Col003 attenuates sepsis-associated coagulation dysfunction in mice in association with reduced platelet activation and NET formation.
In CLP-induced sepsis, platelet HSP47 signaling, platelet activation, and NET formation increased alongside coagulopathy. Pharmacologic inhibition with Col003 attenuated these changes and improved 7-day survival, with the strongest effects when given 3 hours before CLP. Mechanistically, HSP47 promoted NETs via TLR2–MyD88 in neutrophils; Col003 reduced the NET-inducing capacity of platelets from septic mice.
Impact: This work identifies HSP47-driven platelet–neutrophil crosstalk as a modifiable pathway in sepsis-associated coagulopathy and demonstrates survival benefit from targeted inhibition in vivo.
Clinical Implications: HSP47-associated pathways may be druggable targets to mitigate sepsis-associated coagulopathy and NET-mediated injury. Findings justify translational studies to define therapeutic windows, dosing, and safety in humans.
Key Findings
- CLP increased platelet HSP47 signal, platelet activation, granule release, platelet–leukocyte aggregates, NET formation, and coagulopathy markers.
- Col003 attenuated these CLP-induced changes and improved 7-day survival; earliest administration (3 h pre-CLP) yielded the strongest benefit and reduced CitH3.
- Platelets from CLP mice induced NETs in co-culture, whereas platelets from Col003-treated CLP mice had reduced NET-inducing capacity.
- Recombinant HSP47 upregulated TLR2, MyD88, and CitH3 in neutrophils; inhibiting TLR2 or MyD88 reduced HSP47-induced CitH3.
Methodological Strengths
- Robust in vivo CLP sepsis model with survival endpoints and comprehensive hemostatic/immune phenotyping.
- Mechanistic validation via platelet–neutrophil co-culture and pathway inhibition (TLR2–MyD88).
Limitations
- Preclinical murine study; translational relevance to humans remains to be established.
- Greatest efficacy observed with pre-insult dosing; efficacy of delayed (post-sepsis onset) administration requires further testing.
Future Directions: Evaluate post-onset dosing windows, pharmacokinetics/toxicology, bleeding risk, and efficacy in human platelets/neutrophils; explore HSP47 as a biomarker and combination strategies with anticoagulant or NET-targeted therapies.
BACKGROUND: Coagulation dysfunction is a major contributor to the increased mortality associated with sepsis (Levi et al., 2013; Gando et al., 2019 [1,2]), in which platelet activation, neutrophil activation, and neutrophil extracellular trap (NET) formation play important roles. Recent studies have suggested that HSP47 is involved in venous thromboembolism and platelet/neutrophil activation (Thienel et al., 2023a [3]); however, whether HSP47 contributes to platelet-mediated NET
2. Association of Staphylococcus aureus bloodstream infection with 7-day incident delirium in critically Ill adults: a propensity-weighted competing risk analysis.
Among 3,226 ICU patients with bloodstream infections, S. aureus was independently associated with higher 7-day delirium risk versus Gram-negative BSI (sHR 1.39), and the effect was stronger in the first 3 days (sHR 1.60). MRSA phenotype was not independently associated with delirium. SHAP analysis ranked S. aureus infection as the fourth most influential feature; effects were more pronounced in patients with SOFA <5 and without dementia.
Impact: The study delineates a pathogen-specific neurocognitive risk in sepsis, supporting targeted delirium surveillance and prevention strategies for S. aureus bacteremia.
Clinical Implications: Prioritize early delirium screening and ABCDEF-bundle adherence for patients with S. aureus BSI, especially in the first 72 hours. MRSA status alone should not alter delirium prevention strategies.
Key Findings
- S. aureus BSI increased 7-day incident delirium risk versus Gram-negative BSI (sHR 1.39; 95% CI 1.11–1.74; p=0.005) after IPTW-CBPS and multivariable adjustment.
- Association was stronger within 3 days (sHR 1.60; 95% CI 1.27–2.02; p<0.001).
- MRSA phenotype showed no independent association with delirium risk (sHR 1.12; 95% CI 0.81–1.55; p=0.488).
- SHAP ranked S. aureus as the 4th most influential feature; impact was greater in SOFA<5 and patients without dementia (significant interactions).
Methodological Strengths
- Doubly robust causal approach combining IPTW with covariate balancing and multivariable adjustment.
- Competing risk modeling (Fine-Gray) with explainable ML (XGBoost/SHAP) to assess feature importance.
Limitations
- Retrospective database study; residual confounding and misclassification cannot be fully excluded.
- Generalizability beyond a single database and pathogen spectrum warrants external validation.
Future Directions: Prospective validation across centers; mechanistic studies of S. aureus neurotoxins; trials testing intensified delirium prevention bundles in S. aureus BSI.
BACKGROUND: Delirium is a frequent manifestation of acute brain dysfunction in critically ill patients with bloodstream infections (BSI). While the association between sepsis and delirium is well-established, pathogen-specific neurotoxic effects, particularly those induced by Staphylococcus aureus (S. aureus), remain inadequately elucidated. This study aimed to evaluate the independent association between S. aureus BSI and the risk of 7-day incident delirium in critically ill adults. METHODS: A retrospective cohort
3. Surveillance of bacterial colonization and infection in high-risk neonates admitted to tertiary referral hospital in Indonesia.
In this prospective cohort of 46 high-risk neonates, MDRO colonization was common (69.6% among those hospitalized ≥48 h) and higher in outborn infants (RR 1.61), with 93.3% of outborns colonized. Of 110 isolates, 72.7% were MDROs—mainly Klebsiella pneumoniae and Escherichia coli, including carbapenem-resistant and ESBL producers. Positive blood cultures occurred in 8/21 suspected infections, 5 of which were MDROs.
Impact: The study quantifies early and dynamic MDRO colonization in a high-mortality LMIC neonatal unit, identifying outborn status as a key risk factor and informing infection prevention and unit-organization policies.
Clinical Implications: Implement admission colonization screening—especially for outborn neonates—reinforce environmental hygiene and cohorting/separation of outborn and inborn units, and align empiric therapy with local MDRO epidemiology.
Key Findings
- MDRO colonization detected in 69.6% of neonates hospitalized ≥48 h.
- Outborn neonates had higher MDRO colonization risk vs inborn (RR 1.61; 95% CI 1.11–2.33; p=0.018); 93.3% of outborns colonized.
- Of 110 isolates from 146 samples, 72.7% were MDROs, predominately Klebsiella pneumoniae and Escherichia coli, including carbapenem-resistant and ESBL-producing strains.
- Blood cultures were positive in 8/21 suspected infections; 5/8 positives were MDROs.
Methodological Strengths
- Prospective surveillance with serial sampling in a high-risk neonatal population.
- Microbiological characterization capturing carbapenem-resistant and ESBL phenotypes.
Limitations
- Single-center, small sample size limits precision and generalizability.
- Lack of molecular genotyping or transmission mapping; limited linkage between colonization and subsequent infection risk.
Future Directions: Scale to multicenter cohorts with genomic epidemiology to map transmission, evaluate decolonization or cohorting interventions, and quantify impacts on neonatal sepsis and mortality.
BACKGROUND: Neonatal mortality remains high in Indonesia, particularly at our center, Dr. Hasan Sadikin General Hospital, where sepsis is the most common cause of death. However, data on colonization dynamics-which are essential for preventing Multi-drug Resistance Organism (MDRO) acquisition-remain limited, particularly in lower-middle income country (LMIC). This study aims to investigate the dynamics of bacterial colonization among high-risk neonates and determine the pattern and timing of MDRO acquisi