Daily ReportOct 9, 2026
Sepsis, October 9 edition
We read 32 papers and selected 3.
Summary
Today’s most impactful sepsis studies examined how dynamic patient trajectories can improve treatment interpretation and risk stratification. A multicohort analysis suggested that corticosteroid timing may have phenotype-specific associations, while a secondary analysis of a randomized resuscitation trial found that crystalloid composition may interact with fluid strategy; another large multicentre study demonstrated prognostic value in longitudinal sepsis-induced coagulopathy trajectories.
Research Themes
- Dynamic trajectory-based precision treatment in septic shock
- Interaction between crystalloid composition and resuscitation strategy
- Longitudinal phenotyping of sepsis-induced coagulopathy
Selected Articles
1. 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.
In this secondary analysis of a randomized sepsis resuscitation trial, 1,563 patients were classified according to predominant early crystalloid exposure and randomized fluid 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, suggesting an interaction between fluid composition and resuscitation intensity.
Impact: The study moves beyond the simple balanced-crystalloid-versus-saline comparison by testing whether fluid effects depend on the overall resuscitation strategy. Because the strategy was randomized in the parent trial, the analysis provides clinically relevant evidence while appropriately remaining cautious about nonrandomized fluid choice.
Clinical Implications: When a liberal fluid-resuscitation strategy is selected for sepsis, balanced crystalloids may be preferable to saline based on this analysis. The findings do not establish a universal benefit across all patients or strategies and should be integrated with renal, electrolyte, acid-base, and hemodynamic considerations.
Key Findings
- Among 1,563 patients, 423 received predominantly balanced crystalloids, 226 received predominantly normal saline, and 914 received mixed fluids during the first 24 hours.
- The association between fluid type and mortality varied by randomized resuscitation strategy.
- In the liberal-resuscitation arm, balanced crystalloids were associated with lower mortality than normal saline or mixed fluids; this pattern was not observed in the restrictive arm.
Methodological Strengths
- The analysis was anchored in a large randomized trial with prespecified resuscitation-strategy randomization.
- Inverse probability weighting with covariate balancing and an interaction test addressed measured differences in observed fluid exposure and directly evaluated effect modification.
Limitations
- The type of crystalloid was not randomized, so residual confounding by clinician choice and patient characteristics may remain.
- The abstract does not provide complete effect estimates for mortality and secondary outcomes, limiting assessment of precision and absolute clinical benefit.
Future Directions: Future randomized trials should factorially evaluate crystalloid composition and resuscitation intensity, with prespecified renal, acid-base, electrolyte, and mortality outcomes.
BACKGROUND: The optimal crystalloid for sepsis resuscitation and whether choice should differ under restrictive vs liberal strategy remains uncertain. RESEARCH QUESTION: Do outcomes differ by fluid type within liberal vs restrictive resuscitation strategies? STUDY DESIGN AND METHODS: We performed a secondary analysis of the Crystalloid Liberal or Vasopressor Early Resuscitation in Sepsis study. Patients were categorized by the predominant crystalloid in the first 24 hours (> 80%; balanced crystalloids [BCs], normal saline [NS], or mixed) and were stratified by randomized resuscitation strategy (liberal vs restrictive). The primary outcome was death before discharge by day 90. Secondary outcomes included new renal replacement therapy (RRT), organ support-free days, and adverse events. Analysis used inverse probability weighting with covariate balancing and tested a fluid-type by strategy interaction.
2. Hemodynamic trajectory phenotypes may modify associations between corticosteroid timing and outcomes in septic shock.
This retrospective multicohort study identified two reproducible hemodynamic phenotypes in septic shock: Deteriorated and Improved. In the Deteriorated phenotype, corticosteroid initiation after 6 hours was associated with lower 28-day mortality and shorter ventilation duration in MIMIC-IV, but the mortality association was not consistently replicated in the validation cohorts.
Impact: The study challenges the assumption that earlier corticosteroids are uniformly preferable by demonstrating potential effect modification according to dynamic hemodynamic phenotype. Its multicohort design and explicit validation make it a strong hypothesis-generating contribution, while the inconsistent mortality replication appropriately limits clinical interpretation.
Clinical Implications: Hemodynamic trajectory monitoring may help design future phenotype-enriched trials of corticosteroid timing in septic shock. The findings should not currently be used to delay or accelerate corticosteroids in individual patients because the mortality association was not consistently validated.
Key Findings
- Two phenotypes were identified: Deteriorated, with declining hemodynamics and higher mortality, and Improved, with stable or rising trajectories.
- In MIMIC-IV Deteriorated patients, late corticosteroids were associated with lower 28-day mortality (HR 0.88, 95% CI 0.78-0.98) and shorter ventilation duration (HR 0.65, 95% CI 0.58-0.73) than early corticosteroids.
- The mortality association was not consistently replicated in eICU-CRD and PINES, whereas the ventilation-duration association was observed in PINES.
Methodological Strengths
- Dynamic time-warping clustering captured longitudinal hemodynamic patterns rather than relying on a single baseline measurement.
- The study used MIMIC-IV for derivation and two independent cohorts for external assessment, with treatment-weighting methods to address measured confounding.
Limitations
- The retrospective observational design cannot establish that corticosteroid timing caused the observed outcome differences.
- The mortality association was not consistently replicated across validation cohorts, and residual confounding, including indication bias, remains possible.
Future Directions: Prospective studies should prespecify hemodynamic phenotypes, corticosteroid timing, dose, and response outcomes, and should test whether phenotype-guided timing improves patient-centered outcomes in randomized trials.
Corticosteroid trials in septic shock show conflicting results, with patient heterogeneity and treatment timing as likely contributors. We evaluated whether associations between corticosteroid timing and clinical outcomes differed by hemodynamic trajectory phenotype defined by dynamic time warping clustering of Blood Pressure-Vasopressor Index (BPRI) trajectories across three ICU cohorts. We conducted a retrospective cohort study using MIMIC-IV as the derivation cohort and eICU-CRD and PINES as validation cohorts. Adult patients with septic shock receiving vasopressors were included. Hemodynamic phenotypes were identified from 168-h BPRI trajectories.
3. Longitudinal sepsis-induced coagulopathy score trajectories and mortality in relation to early prophylactic heparin: a multicentre cohort study.
This large multicentre cohort study identified three longitudinal SIC trajectories—Persistently High, Rising-then-Falling, and Resolving—in both MIMIC-IV and eICU-CRD. Persistently High and Rising-then-Falling trajectories were associated with higher mortality than Resolving trajectories. Early prophylactic unfractionated heparin was associated with lower mortality in MIMIC-IV but not independently replicated in eICU-CRD.
Impact: The work demonstrates that longitudinal SIC patterns contain prognostic information beyond a single admission score and provides external replication across two large critical-care databases. Its cautious interpretation of the heparin finding is scientifically important because it separates prognostic stratification from an unsupported treatment recommendation.
Clinical Implications: Serial SIC assessment may improve prognostic communication and selection of patients for prospective trials. The trajectory classes should not currently guide anticoagulation decisions, because the exploratory heparin association was not replicated across databases.
Key Findings
- Three SIC trajectories were identified in both databases: Persistently High, Rising-then-Falling, and Resolving.
- Compared with the Resolving trajectory, adjusted mortality subdistribution hazard ratios for Persistently High and Rising-then-Falling trajectories were 1.65 and 1.33 in MIMIC-IV, and 1.73 and 1.67 in eICU-CRD.
- Prophylactic heparin was associated with lower post-landmark mortality in MIMIC-IV (sHR 0.908, 95% CI 0.839-0.983), but the association was not independently replicated in eICU-CRD.
Methodological Strengths
- The study included more than 25,000 patients from two established multicentre critical-care databases.
- Latent class mixed modeling captured longitudinal disease behavior, and external database assessment tested the reproducibility of trajectory classes and mortality associations.
Limitations
- The retrospective database design limits causal inference and may be affected by coding differences, missing data, and unmeasured confounding.
- The exploratory heparin analysis was inconsistent between databases and cannot support trajectory-based anticoagulation recommendations.
Future Directions: Prospective studies should validate real-time trajectory classification and determine whether trajectory-informed monitoring or interventions improve outcomes. Randomized trials are required to evaluate any potential benefit of heparin in biologically defined SIC subgroups.
BACKGROUND: Sepsis-induced coagulopathy (SIC) evolves dynamically, and a single-timepoint score may not capture its longitudinal course. This study characterised SIC score trajectories, evaluated their associations with mortality, and conducted exploratory analyses of early prophylactic unfractionated heparin exposure. METHODS: SIC score trajectories were characterised using a latent class mixed model. Trajectory-class prediction models were developed from baseline features within the first 24 hours of ICU admission using five algorithms. Heparin analysis used a 48-hour landmark design; weighted Fine-Gray models and cumulative incidence functions estimated 28-day post-landmark in-hospital mortality. RESULTS: The study enrolled 20,168 patients from MIMIC-IV and 5,829 from eICU-CRD. Three SIC trajectories were identified-Persistently High, Rising-then-Falling, and Resolving-comprising 31.9%, 10.6%, and 57.5% of patients in MIMIC-IV and 49.1%, 7.2%, and 43.7% in eICU-CRD.