ICU Weekly
Issue #02May 18, 2026

Bedside-grade scientific intelligence

When biology tells usexactly where to look —listening changes everything.

From endotype-guided endotoxin adsorption to presepsin-stratified immunotherapy, this edition traces a clear signal: the future of critical care is not treating categories of patients — it is treating the right biology in the right person at the right moment.

📍This edition coversEndotoxin Adsorption in Septic Shock · Procalcitonin + NEWS2 in ED · Hyperactive Delirium · HFNO vs NIV · Precision Immunotherapy in Pneumonia · Transfusion Thresholds in ICU

Featured articles

01
RCT Phase 3BayesianIF ≈ 38.7CEBM 1B

Polymyxin B haemoadsorption in endotoxic septic shock (TIGRIS): a multicentre, open-label, Bayesian, randomised, controlled, phase 3 trial

The Lancet Respiratory Medicine · 2026 · 19 US hospitals · n = 287

A phase 3 Bayesian RCT enrolling adults with septic shock, multiorgan dysfunction, and endotoxin activity (EAA) between 0.60 and 0.89 units — the "high but not maximal" endotoxin phenotype identified in the EUPHRATES trial. Patients were randomized 2:1 to two sessions of polymyxin B haemoadsorption plus standard care versus standard care alone.

The study used a prespecified Bayesian analysis that formally pooled evidence from both EUPHRATES and TIGRIS, making this the first prospective validation of the enriched endotoxin endotype in septic shock research.

DOI 10.1016/S2213-2600(26)00047-0View original article
02
RCT Phase 3IF ≈ 38.7CEBM 1B

Procalcitonin testing combined with NEWS2 evaluation compared with usual care for identification of sepsis and antibiotic initiation in the emergency department (PRONTO)

The Lancet Respiratory Medicine · 2026 · 20 NHS emergency departments · UK · n ≈ 7,676

Parallel-group, open-label RCT across 20 NHS emergency departments. The intervention arm used a procalcitonin-guided algorithm combined with standard NEWS2 scoring to guide early sepsis identification and antibiotic initiation decisions. The control arm followed NEWS2-based usual care alone.

Three pre-specified interim analyses with group-sequential stopping rules for both effectiveness and futility. Co-primary endpoints: antibiotic initiation rate and 28-day all-cause mortality.

DOI 10.1016/S2213-2600(25)00433-3View original article
03
RCTDouble-BlindIF ≈ 21.0CEBM 1B

Dexmedetomidine for treatment of hyperactive delirium in non-intubated ICU patients: the 4D randomized clinical trial

Intensive Care Medicine · 2025 · Vol. 51: 2305–2317 · 9 ICUs · n = 151

Multicenter double-blind placebo-controlled RCT in 9 ICUs enrolling non-intubated critically ill adults with hyperactive delirium. Patients received continuous IV dexmedetomidine or placebo for a minimum of 36 hours.

The primary endpoint was a joint composite model incorporating agitation duration, delirium duration, and need for intubation with deep sedation — capturing the full clinical burden of the hyperactive delirium phenotype in the non-intubated patient, a population historically excluded from most sedation trials.

DOI 10.1007/s00134-025-08135-1View original article

Also in this edition

04
RCTn=1,800IF ≈ 120CEBM 1B

High-Flow Nasal Oxygen vs Noninvasive Ventilation in Acute Respiratory Failure: The RENOVATE Trial

JAMA · 2025 · 33 hospitals in Brazil · 5 ARF phenotypes

HFNO compared to NIV across hypoxemic, immunocompromised, COPD, cardiogenic pulmonary edema, and COVID-19 phenotypes. Non-inferior across all groups: intubation or death at 7 days 39% vs 38%. Bayesian hierarchical model with dynamic borrowing across phenotypes. Clinical upshot: equivalent efficacy with better patient tolerance and simpler interface logistics.

View original articledoi.org/10.1001/jama.2024.26244
05
RCT Phase IIaCEBM 1B*

Anakinra in reducing progression to organ dysfunction in patients with pneumonia (INSPIRE): a randomised phase IIa trial

Lancet Reg Health Eur · 2026

Hospitalized adults with pneumonia, qSOFA = 1, and presepsin >350 pg/mL as enrichment biomarker. Subcutaneous anakinra 100 mg/day for 10 days vs placebo. Primary endpoint: ≥2-point SOFA increase by day 7 or death by day 90. Result: anakinra prevented organ dysfunction progression; mechanism linked to IL-1β pathway attenuation. Phase IIa — confirmatory Phase III required before practice change.

View original articledoi.org/10.1016/j.lanepe.2025.101573
06
Meta-AnalysisCEBM 1A

Liberal vs Restrictive Transfusion Thresholds in Critically Ill Patients: A Systematic Review and Meta-Analysis

J Clin Med · 2025 · 13 RCTs · n = 13,705

Compared Hb threshold ≥7 g/dL (restrictive) versus ≥9 g/dL (liberal). No statistically significant difference in 30-day, 90-day, or 180-day mortality. No difference in dialysis requirement, ICU/hospital LOS, or ARDS incidence. Trial sequential analysis confirmed findings are robust and unlikely to change with additional trials. AMSTAR-2 quality: high. Guideline alignment: confirmed.

View original articledoi.org/10.3390/jcm14062049

Quick hits · clinical pearls

🔬Precision endotype · TIGRIS

The endotoxin window: not every septic patient qualifies

TIGRIS benefit is strictly contingent on EAA between 0.60 and 0.89. Below 0.60: endotoxemia insufficient to drive a meaningful response to adsorption. Above 0.89: the inflammatory cascade is already self-sustaining and removing the trigger offers no survival benefit. Clinical implication: phenotyping before intervening — this is precision sepsis medicine in the bedside sense of the word.

🫁Respiratory support · RENOVATE

HFNO is a legitimate first-line choice across ARF phenotypes

RENOVATE closes the debate across five distinct respiratory failure populations. When outcomes are equivalent, clinical factors tip the balance: HFNO offers better tolerance, no mask-interface issues, and cleaner monitoring of respiratory rate and effort. The one scenario to keep NIV: when you need driving pressure monitoring or when hypercapnia drives the clinical picture.

💊Immunotherapy · INSPIRE

Presepsin as enrichment biomarker: the INSPIRE stratification model

Presepsin >350 pg/mL identifies the pneumonia patient at risk of organ progression, independent of standard severity scoring. Anakinra (IL-1 receptor antagonist) interrupts the IL-1β amplification loop — a physiologically coherent target for this inflammatory phenotype. Phase IIa status means the signal is validated, not yet actionable for practice change. Watch for Phase III.

🧠Delirium pathway · 4D Trial

Non-intubated hyperactive delirium needs its own protocol

Most ICU delirium bundles conflate the non-intubated and ventilated patient. The 4D trial establishes that they are different clinical phenotypes requiring different pharmacological strategies. Recommended action: review your unit's delirium algorithm and explicitly carve out a non-intubated hyperactive pathway with dexmedetomidine as a named first-line pharmacological option — separate from your ventilated sedation ladder.

Resources

Closing note

The greatest obstacle to discovery is not ignorance — it is the illusion of knowledge.

Daniel Boorstin · American Medical Library Association Keynote Address

Every time a trial contradicts what I was certain I knew — like PRONTO showing that the real value of a biomarker might be in structuring thought rather than directing decisions — I'm reminded that our certainties are the most dangerous thing we carry into the room. The data doesn't conform to our intuitions. Our intuitions must conform to the data. That's not a sign of weakness. That's the only way to keep getting better.

— Caroline

Next edition — Issue #03

Coming up

  • · Point-of-care ultrasound in hemodynamic instability — new evidence
  • · Early enteral nutrition timing in the ventilated patient
  • · AI-assisted early warning systems in ICU triage — what the evidence supports