Weekly ReportOct 5–11, 2026
Sepsis, week 41 edition
We read 184 papers and selected 3.
Summary
This week’s sepsis literature emphasized precision medicine, biologically informed risk stratification, and context-dependent supportive care. Proteomic subphenotyping identified reproducible inflammatory and noninflammatory forms of sepsis-associated acute kidney injury, while mechanistic work linked early-life microbiota to epithelial calprotectin-mediated protection from neonatal sepsis. A secondary analysis suggested that balanced crystalloids may be most beneficial during liberal fluid resuscitation, reinforcing that fluid composition and treatment intensity should be considered together. Across the week, findings challenged one-size-fits-all screening, hemodynamic, glycemic, anticoagulation, and vasopressor strategies.
Selected Articles
1. Plasma proteomics defines two reproducible subphenotypes of sepsis-associated acute kidney injury with distinct outcomes.
Across three independent patient groups, ensemble plasma-proteomic clustering identified two reproducible subphenotypes of sepsis-associated acute kidney injury. The inflammatory subtype showed broad activation of inflammation, metabolism, and oxidative stress and was associated with higher mortality, more complications, and fewer ICU-free days. A seven-protein panel reproduced the classification, and exploratory trial data suggested that ilofotase alfa may benefit the inflammatory subtype.
Impact: This study directly addresses biological heterogeneity as a major reason for failed sepsis-associated kidney injury trials. It provides a reproducible molecular classification, a potentially deployable simplified biomarker panel, and a hypothesis for biomarker-guided therapy.
Clinical Implications: The seven-protein panel could eventually support risk stratification and selection for targeted therapies, but it is not ready for routine clinical use. Prospective validation with standardized assays and biomarker-stratified randomized trials is required.
Key Findings
- Two reproducible plasma-proteomic subphenotypes were identified across three independent patient groups.
- The inflammatory subtype was associated with higher mortality, more complications, and fewer ICU-free days.
- A seven-protein panel reproduced the classification, and exploratory data suggested possible benefit from ilofotase alfa.
2. Early-life microbiota direct an epithelial S100 program required for neonatal immunity.
In neonatal mouse models, initial exposure to commensal microbiota induced intestinal epithelial S100A8/S100A9 calprotectin production. Impaired colonization or calprotectin expression increased susceptibility to sepsis and death, whereas exogenous calprotectin rescued microbiota-depleted pups from lethal infection. The study identifies an epithelial antimicrobial pathway that may complement conventional immune-cell-centered models of neonatal sepsis prevention.
Impact: The paper provides causal mechanistic evidence that early microbial colonization programs epithelial antimicrobial defense. It opens a prevention-oriented translational pathway involving microbiota preservation or calprotectin supplementation for high-risk neonates.
Clinical Implications: Microbiota-preserving strategies and calprotectin-based interventions warrant translational investigation in high-risk neonates. Human validation, developmental safety studies, dose definition, and assessment of microbiome effects are required before clinical application.
Key Findings
- Commensal microbiota exposure induced S100A9 expression and calprotectin production by neonatal intestinal epithelial cells.
- Impaired microbiota colonization or calprotectin expression increased susceptibility to neonatal sepsis and death.
- Calprotectin administration rescued microbiota-depleted neonatal mice from lethal infection.
3. Impact of Balanced Crystalloids vs Saline by Resuscitation Strategy in Sepsis: A Secondary Analysis of the Crystalloid Liberal or Vasopressor Early Resuscitation in Sepsis Trial.
This secondary analysis classified 1,563 patients according to predominant early crystalloid exposure and stratified them by randomized liberal or restrictive resuscitation strategy. Balanced crystalloids were associated with lower mortality than saline or mixed fluids in the liberal-resuscitation arm, but this association was not observed with a restrictive strategy. The findings suggest that fluid composition and resuscitation intensity may interact.
Impact: Rather than treating balanced crystalloids versus saline as a universal comparison, the study tested whether benefit depends on resuscitation intensity. It provides clinically actionable, though nondefinitive, evidence for integrating fluid choice with the overall resuscitation strategy.
Clinical Implications: Balanced crystalloids may be preferable when a liberal fluid-resuscitation strategy is used, while universal benefit across all patients is not established. Clinicians should still consider renal function, electrolyte balance, acid-base status, and individual hemodynamics.
Key Findings
- Among 1,563 patients, 423 received predominantly balanced crystalloids, 226 saline, and 914 mixed fluids during the first 24 hours.
- Balanced crystalloids were associated with lower mortality than saline or mixed fluids in the liberal-resuscitation arm.
- The mortality association was not observed in the restrictive-resuscitation arm, suggesting treatment-strategy interaction.