Introduction and Context
Refractory septic shock is the point at which ordinary sepsis care is no longer enough: blood pressure remains unstable, tissue perfusion stays poor, vasopressor needs climb, and organ failure can continue despite intensive treatment. Until now, however, there has been no universally accepted clinical definition. That gap has made it harder to compare patients, stratify risk, design trials, and decide when a patient has crossed into the most severe end of the septic shock spectrum.
The new joint Delphi consensus from the Society of Critical Care Medicine and the European Society of Intensive Care Medicine was created to solve that problem. Rather than asking whether refractory septic shock should exist as a concept, the panel asked a more practical question: what clinical criteria should define it at the bedside? The result is not a treatment guideline, but a consensus framework intended to standardize diagnosis, prognostication, and research enrollment.
The panel included 56 participants from 57 invitations and used a five-round Delphi process. Consensus required at least 75% agreement or disagreement on the highest or lowest three points of a 7-point Likert scale, or equivalent agreement on single- or multiple-choice questions. In total, the steering committee proposed 34 statements; 29 were carried forward after early rejection of five, and consensus was achieved for 13 criteria across eight domains.
What the New Consensus Says
The panel agreed that refractory septic shock should be identified using a combination of persistent hypoperfusion, high vasopressor requirement, and failure to respond to fluid resuscitation. The most important practical elements were:
- Persistent tissue hypoperfusion: elevated lactate and/or prolonged capillary refill time.
- Fluid unresponsiveness: the patient does not meaningfully improve after initial resuscitation and formal assessment of fluid responsiveness.
- High vasoactive support: norepinephrine-equivalent dose greater than 0.5 micrograms per kilogram per minute.
- Assessment for mixed shock: critical care ultrasound when cardiogenic, obstructive, or other mixed shock is suspected.
In plain language, the consensus says that refractory septic shock is not just septic shock with low blood pressure. It is septic shock that remains severely unstable even after fluids, with ongoing signs of poor perfusion and a substantial need for vasopressors.
| Aspect | Before the consensus | Now |
|---|---|---|
| Definition | No standard global definition; local practice varied widely | Standardized clinical framework from SCCM-ESICM Delphi consensus |
| Perfusion marker | Lactate often used, but not uniformly | Lactate and/or prolonged capillary refill time are central criteria |
| Vasopressor intensity | Different thresholds used in studies and ICUs | Norepinephrine-equivalent dose >0.5 micrograms/kg/min |
| Fluid response | Variable bedside assessment | Formal fluid-unresponsiveness is part of the definition |
| Mixed shock evaluation | Often inconsistent | Critical care ultrasound recommended when mixed shock is suspected |
Topic-by-Topic Recommendations
1. Tissue perfusion: lactate and capillary refill time
The consensus places lactate and capillary refill time side by side because they reflect different aspects of shock. Lactate is widely available and strongly linked to risk, but it is not specific for hypoperfusion alone. It can rise because of adrenergic stress, impaired clearance, or other metabolic factors. Capillary refill time is simple, fast, and inexpensive, and it may capture peripheral perfusion that lactate misses. The panel’s message is not that one is better than the other, but that either persistent lactate elevation or prolonged capillary refill time should raise concern for refractory shock.
2. Fluid responsiveness after initial resuscitation
A key criterion is that the patient is fluid unresponsive. This matters because more fluid is not always the answer once initial resuscitation is complete. The consensus supports using bedside assessment to avoid endless fluid loading in patients who are unlikely to benefit. In practice, this means dynamic evaluation rather than static assumptions: passive leg raise, stroke volume changes, or other validated hemodynamic tests may help determine whether additional fluid will improve circulation.
3. Vasopressor burden
The threshold of norepinephrine-equivalent dose greater than 0.5 micrograms per kilogram per minute gives clinicians and researchers a concrete marker of severity. Using norepinephrine equivalents is important because many ICU patients receive more than one vasopressor or adjunctive agent. The threshold is intended to capture very high vasopressor dependence, not merely early septic shock treatment. Importantly, this cutoff is consensus-based; it is useful for standardization, but it is not yet a biologically proven biological breakpoint.
4. Critical care ultrasound when mixed shock is suspected
The only diagnostic modality to reach consensus-based agreement was critical care ultrasound. This reflects growing recognition that not all shock in a septic patient is purely distributive. Ventricular dysfunction, right heart strain, tamponade, or other forms of mixed shock can coexist and change management. The panel did not suggest CCUS for every patient in the same way, but it did agree that it should be used when the clinical picture suggests more than one shock mechanism.
5. Organ dysfunction remains part of the picture
The panel also agreed on markers of organ dysfunction as part of the definition. That is clinically sensible: refractory septic shock is not just about pressure numbers. It is about persistent circulatory failure with ongoing injury to the kidneys, brain, liver, coagulation system, or other organs. The consensus does not reduce the syndrome to a single lab value or dose threshold; it frames the patient as a whole.
Why This Is Different from Earlier Practice
Before this consensus, the term refractory septic shock was widely used but inconsistently defined. Some clinicians used very high vasopressor doses as the main trigger. Others emphasized lactate clearance, persistent oliguria, or failure of blood pressure to normalize. That variability made it difficult to compare outcomes across studies and often delayed recognition that a patient had reached a particularly high-risk state.
The new consensus does three things at once:
- It gives clinicians a shared vocabulary.
- It creates a more uniform research phenotype for future trials.
- It encourages earlier recognition of persistent hypoperfusion and mixed shock.
This is a definitional advance, not a new drug or rescue strategy. Its value lies in standardization.
Expert Commentary and Remaining Controversies
The expert panel was united on the need for a comprehensive clinical definition, but several issues remain unresolved.
First, the threshold for norepinephrine equivalents is practical, but not definitively outcome-validated. Different ICUs also vary in how they convert vasopressor doses, so implementation will require local standardization.
Second, lactate is a powerful risk marker, but not a perfect perfusion marker. A patient with improving circulation can still have a persistently elevated lactate for non-hemodynamic reasons. Conversely, peripheral perfusion can remain poor even as lactate falls. That is why the consensus wisely avoids forcing clinicians to choose one marker over the other.
Third, capillary refill time is attractive because it is simple and bedside-friendly, but it is also technique-dependent. Training and consistent measurement matter.
Fourth, critical care ultrasound is valuable, but not every ICU has the same expertise or access. The consensus may therefore accelerate calls for broader ultrasound training in critical care practice.
Overall, the panel’s view appears to be that the syndrome should be recognized by a pattern of persistent severity, not by a single laboratory cutoff or one device reading.
Practical Implications for Clinicians
For bedside teams, the consensus can be translated into a simple workflow:
- Confirm septic shock and complete initial resuscitation.
- Check for persistent hypoperfusion using lactate and/or capillary refill time.
- Assess whether the patient is fluid responsive before giving more fluid.
- Estimate total vasopressor burden using norepinephrine equivalents.
- Use critical care ultrasound if mixed shock is suspected.
A short vignette makes the concept clearer. Imagine Michael, a 68-year-old man with pneumonia and septic shock. He receives appropriate antibiotics, fluid resuscitation, and vasopressors. Hours later, his mean arterial pressure is only maintained on very high norepinephrine-equivalent support, his lactate remains elevated, his capillary refill is still delayed, and he is no longer fluid responsive. Under the new consensus, Michael fits the clinical pattern of refractory septic shock and should be recognized as a patient at exceptionally high risk who may need advanced ICU decision-making.
For research, this consensus is especially important. A shared definition should improve trial enrollment, reduce phenotype noise, and make it easier to test rescue therapies, vasopressor strategies, and perfusion-guided resuscitation protocols.
For health systems, the definition may also help with escalation pathways, staffing, and communication with families, especially when the prognosis becomes guarded.
Bottom Line
The new SCCM-ESICM consensus fills a major gap in critical care. Refractory septic shock is now framed as septic shock with persistent hypoperfusion, fluid unresponsiveness, and very high vasopressor requirements, with critical care ultrasound used when mixed shock is suspected. The definition will not solve refractory septic shock by itself, but it gives clinicians and researchers a much-needed common language.
References
- Leone M, Myatra SN, Dugar S, et al. Clinical Criteria for the Definition of Refractory Septic Shock: A Joint Delphi Consensus from the Society of Critical Care Medicine (SCCM) and European Society of Intensive Care Medicine (ESICM). Crit Care Med. 2026;54(5):1073-1091. PMID: 41873857.
- Evans L, Rhodes A, Alhazzani W, et al. Surviving Sepsis Campaign: International Guidelines for Management of Sepsis and Septic Shock 2021. Intensive Care Med. 2021;47(11):1181-1247.
- Hernández G, Ospina-Tascón GA, Damiani LP, et al. Effect of a Resuscitation Strategy Targeting Peripheral Perfusion Status vs Serum Lactate Levels on 28-Day Mortality Among Patients With Septic Shock: The ANDROMEDA-SHOCK Randomized Clinical Trial. JAMA. 2019;321(7):654-664.
