TL;DR: ⚪ Null — the Surviving Sepsis Campaign's 1-hour bundle showed no clear in-hospital mortality benefit in this stepped-wedge ED trial, contrasting with prior Japanese observational data.
1. Publication
- Title: Effect of the 1-h bundle on mortality in patients with suspected sepsis in the emergency department: a stepped wedge cluster randomized clinical trial
- Acronym: 1-BED (1-hour Bundle in the Emergency Department)
- Year & Journal: Intensive Care Medicine, published June 24, 2024 (50(7):1086-1095)
- Citation: Freund Y, Cancella de Abreu M, Lebal S, et al. Intensive Care Med. 2024;50(7):1086-1095. doi:10.1007/s00134-024-07509-1
2. Context & Rationale
Background: The Surviving Sepsis Campaign's "1-hour bundle" (lactate measurement, blood cultures, broad-spectrum antibiotics, 30mL/kg crystalloid for hypotension/lactate≥4) remains controversial — endorsed by guidelines but with limited randomized evidence of mortality benefit, particularly outside Japan (where observational data suggested benefit).
Research Question/Hypothesis: In ED patients with suspected sepsis, does implementation of the 1-hour bundle reduce in-hospital mortality (truncated at 28 days) compared with usual care?
3. Design & Methods
- Study Type: Pragmatic, stepped-wedge, cluster-randomized clinical trial
- Setting & Centers: 23 EDs, France and Spain
- Population: Adults with Sepsis-3 criteria, qSOFA≥2, or lactate>2 mmol/L (872 patients, enrolled June 2022–September 2023)
- Intervention: Implementation of the 1-hour sepsis bundle
- Comparator: Usual care (pre-implementation period, stepped-wedge design)
- Statistical Power & Follow-Up: Primary: in-hospital mortality truncated at 28 days. Secondary: fluid volume at 24h, acute heart failure at 24h, SOFA at 72h, ICU LOS, MV/RRT days, vasopressor-free days, unnecessary antibiotics, 28-day mortality.
4. Key Results
872 patients across 23 EDs.
Outcome | 1-Hour Bundle | Usual Care | Notes |
In-hospital mortality, truncated at 28d (primary) | Not significantly reduced | — | Per independent summary (JournalFeed, JACEP Open): an "insignificant reduction" in mortality |
Secondary outcomes (fluid volume, SOFA, LOS, etc.) | Mixed | — | Not reported in accessible text in full detail |
Note on data completeness: Exact numeric mortality percentages and full secondary-outcome statistics were not available in the accessible source text beyond the qualitative characterization ("insignificant reduction in 28-day mortality") from independent commentary; readers should consult the primary Intensive Care Medicine publication for precise figures.
5. Internal Validity Assessment
Stepped-wedge cluster-randomized design across 23 EDs in 2 countries — a rigorous pragmatic design allowing each site to serve as its own control across time periods. Overall: Moderate — stepped-wedge design is methodologically sound for a system-level bundle implementation, though exact effect-size data were not accessible for this summary, and stepped-wedge designs carry inherent risk of temporal confounding (secular trends in sepsis care during the study period).
6. External Validity Assessment
French and Spanish ED population with suspected sepsis — broadly representative of European ED sepsis populations; contrasts with prior Japanese observational data (Umemura et al.) that had suggested bundle-adherence mortality benefit.
7. Strengths & Limitations
Strengths: Pragmatic, real-world, multicenter, multinational stepped-wedge design; directly tests a widely-recommended but weakly randomized-evidence-supported guideline bundle.
Limitations: Exact statistical results not fully accessible for this summary; stepped-wedge design vulnerable to temporal confounding; a post hoc analysis of the same trial data (Philippon et al.) further examined time-to-antibiotic associations, suggesting ongoing secondary analysis of this rich dataset.
8. Interpretation & Practice Impact
Provides randomized (rather than purely observational) evidence on the 1-hour bundle's mortality effect in suspected ED sepsis — the qualitatively "insignificant" reduction suggests the bundle's mortality benefit, if any, is smaller than observational Japanese data had suggested, though full quantitative interpretation requires the primary publication.
9. Controversies & Subsequent Evidence
A post hoc analysis of this same trial (Philippon et al., "Association between time to antibiotic and mortality... post hoc analysis of the 1-BED trial") specifically examined time-to-antibiotic and time-to-fluid effects on mortality, suggesting the field is now mining this trial's data for more granular timing-specific insights beyond the bundle-as-a-whole result. A parallel line of work (Umemura et al., Japan, PLoS One 2022) had found bundle adherence associated with reduced in-hospital mortality observationally — this RCT provides an important randomized counterpoint/complement to that observational signal.
10. Summary & Executive Takeaway
Summary: This stepped-wedge cluster-randomized trial across 23 French and Spanish EDs tested implementation of the Surviving Sepsis Campaign's 1-hour bundle in 872 patients with suspected sepsis. In-hospital mortality (truncated at 28 days) was not significantly reduced per independent commentary characterization.
Overall Takeaway: This randomized, pragmatic test of the 1-hour sepsis bundle in European EDs found no clear mortality benefit, contrasting with prior Japanese observational data — an important randomized data point tempering enthusiasm for the bundle's mortality impact, while related post hoc analyses continue exploring more granular timing questions from this dataset.
11. Bibliography
- Umemura Y, Abe T, Ogura H, et al. Hour-1 bundle adherence was associated with reduction of in-hospital mortality among patients with sepsis in Japan. PLoS One. 2022;17(2):e263936.
- Philippon AL, Lebal S, Cancella de Abreu M, et al. Association between time to antibiotic and mortality: post hoc analysis of the 1-BED trial. Acad Emerg Med/JACEP Open. 2025.