The definition changed, and it changed for a reason
Sepsis is life-threatening organ dysfunction caused by a dysregulated host response to infection. Septic shock is the subset with circulatory and/or cellular or metabolic dysfunction associated with a higher risk of mortality.
This page deliberately teaches two layers at once, and labels which is which. Know the difference before clinicals — and before an exam question tries to catch you.
- Definitions. The Sepsis-3 definitions (2016) are still operative. The continuum is infection → sepsis → septic shock. There is no “Sepsis-4,” and Sepsis-3 retired the term severe sepsis as redundant.
- Guidelines, newest first. SSC 2026 (Prescott HC, Antonelli M, Alhazzani W, et al. Crit Care Med 2026;54:725–812) supersedes SSC 2021 (Evans L, et al. Crit Care Med 2021;49(11):e1063–e1143), which superseded SSC 2016. Recommendations on this page are tagged by which guideline they come from.
- The Hour-1 Bundle is a 2018 document. It comes from the 2018 SSC bundle update (Levy MM, Evans LE, Rhodes A. Crit Care Med 2018;46(6):997–1000) — not from SSC 2021 or SSC 2026. Neither later guideline re-endorsed it as a bundle; SSC 2021 replaced it with severity-stratified individual recommendations, and SSC 2026 preserved that stratified approach. Your course textbook (Blessing & Sabol, Ch 76) teaches the Hour-1 bundle, so this page still teaches it — labeled for what it is — and then gives you the current severity-stratified timing. That is the honest version of both.
SIRS was abandoned
The systemic inflammatory response syndrome (SIRS) criteria — in use since 1991 — were abandoned with the Sepsis-3 definition. The reason: SIRS criteria are sensitive but not specific. You can meet two SIRS criteria with a common cold, and you can have lethal sepsis without them.
Organ dysfunction, not inflammation
Sepsis is now defined by organ dysfunction from a dysregulated host response, quantified by the SOFA score. Sepsis-3 offered qSOFA as a bedside prompt — but SSC 2021 recommended against qSOFA as a single screening tool, and SSC 2026 positively prefers NEWS, NEWS2, MEWS, or SIRS over it. This reframing moved the diagnosis from "is there inflammation?" to "is an organ failing?"
Shock is distributive
Sepsis is a distributive shock state: vasodilation, loss of vasomotor tone, venous pooling, and relative hypovolemia. Death occurs through multiorgan failure, and respiratory failure arrives as ARDS.
Infection begins a vicious cycle of coagulation and inflammation. The ' 'introduction of infective organisms into the bloodstream alters vascular tone, producing ' 'relative hypovolemia. In shock states, oxygen consumption exceeds oxygen delivery, which produces cellular hypoxia, anaerobic metabolism, lactic and pyruvic acid, and falling ATP. As pH falls, proteolytic enzymes are released that destroy the cell membrane — and once the integrity of the cell membrane is lost, the cellular changes are irreversible.
That is why the treatment of sepsis is a race against a cellular clock, not just a battle ' 'against bacteria.
Where sepsis sits among the shock states
| Class | Primary problem | Hemodynamic signature |
|---|---|---|
| Hypovolemic | Inadequate circulating volume | ↓ preload (CVP), ↓ PAWP, ↓ cardiac output, ↑ SVR |
| Cardiogenic | The pump fails | ↑ preload, ↑ PAWP, ↓ cardiac output, ↑ SVR |
| Obstructive (extracardiac) | Flow is blocked — tension pneumothorax, tamponade, massive PE | ↓ preload, ↑ PAWP, ↓ cardiac output, ↑ SVR |
| Distributive — including sepsis | Vasodilation and loss of vasomotor tone → venous pooling → relative hypovolemia | Preload ↓ (↓ in septic), PAWP ↓ (↓ in septic), cardiac output ↑ (↑ in septic), SVR ↓ (↓↓ in septic) |
Septic shock is the only shock state with a low systemic vascular resistance and a high cardiac output — warm, vasodilated, bounding pulses early on. Every other class is vasoconstricted with a low output. This is why a septic patient can look deceptively well-perfused while their organs are starving.
Sepsis, septic shock, and the scores
The categories form a severity ladder. Each step is defined by a measurable finding, not by how the patient looks.
| Term | Definition | The line that separates it |
|---|---|---|
| Infection | The presence of a pathogen in a normally sterile site | Infection without organ dysfunction is not sepsis. |
| Sepsis | Life-threatening organ dysfunction caused by a dysregulated host response to infection | Organ dysfunction is the defining feature — operationalized by a change in the SOFA score. |
| Septic shock | A subset of sepsis with circulatory and/or cellular or metabolic dysfunction associated with a higher risk of mortality | Exact Sepsis-3 criteria: sepsis with a vasopressor requirement to maintain MAP ≥ 65 mmHg and a serum lactate > 2 mmol/L (> 18 mg/dL) in the absence of hypovolemia. Associated with hospital mortality greater than 40%. Course textbook phrasing (looser): “remains hypotensive despite volume resuscitation and requires vasopressors, or has a markedly elevated lactate.” |
Sepsis-3 concluded that “the term severe sepsis was redundant” and eliminated it. The ladder is infection → sepsis → septic shock — nothing in between. If you hear or read “severe sepsis,” it is pre-2016 vocabulary; translate it as sepsis (or septic shock if the shock criteria above are met). Examiners still use the old term, so recognize it — just do not chart it.
qSOFA — the score everyone knows, and the screen the guidelines moved past
The sepsis-related quick Sequential Organ Failure Assessment score uses three bedside variables, each worth 1 point. Learn it — then learn what SSC 2021 and SSC 2026 say about using it as your only screen.
| Criterion | Threshold |
|---|---|
| Respiratory rate | ≥ 22/min |
| Mental status | Abnormal — altered mentation, GCS < 15 |
| Systolic blood pressure | ≤ 100 mmHg |
qSOFA was proposed as a bedside prompt to escalate concern in patients outside the ICU who are suspected of infection. Two or more points should make you think hard about organ dysfunction.
SSC 2021 — strong recommendation AGAINST qSOFA as a single screening tool. Used alone (compared with SIRS, NEWS, or MEWS), qSOFA misses too many patients because its sensitivity is poor.
SSC 2026 — upgraded to a positive recommendation. In acutely ill patients in hospital, use NEWS, NEWS2, MEWS, or SIRS over qSOFA as a single screening tool (strong recommendation, moderate certainty). The number to remember: in a study of more than 221,000 patients screened prehospital, qSOFA had the lowest sensitivity of all the scores — 23.1% (95% CI 21.8–24.3%) for identifying sepsis, while NEWS2 performed best. A tool that misses roughly three of every four septic patients cannot be your only screen.
The 2026 nuance, so you do not overcorrect: qSOFA “is still useful for detecting clinical deterioration,” and electronic qSOFA screening with an alert-and-response system improved 90-day mortality (adjusted RR 0.85, 95% CI 0.77–0.93; the SCREEN trial, n = 60,055). SSC 2026 also suggests a standardized sepsis screening tool during ambulance or flight transport, and a “code sepsis” / “sepsis huddle” protocol — and it states as a good-practice statement that “sepsis is a clinical diagnosis and should not be ruled in or out using a single biomarker or diagnostic test.”
Bedside translation: raise suspicion with qSOFA if that is what your unit uses, but screen with a systems-based tool, escalate on clinical trajectory, and never use a normal qSOFA to rule sepsis out.
SOFA — the organ dysfunction score
Six organ systems. The same six systems Sepsis-3 uses to operationalize organ dysfunction.
| System | What is measured | The direction of badness |
|---|---|---|
| Respiration | PaO2/FiO2 ratio | Lower ratio = worse. Recall from ARDS: < 300 is acute lung injury, < 200 is ARDS. |
| Coagulation | Platelet count | Thrombocytopenia — decreased as a result of platelet aggregation and microemboli. |
| Liver | Bilirubin | Rising bilirubin = worsening hepatic dysfunction. |
| Cardiovascular | Mean arterial pressure and vasopressor requirement | The need for vasopressors to maintain MAP is the cardiovascular failure that defines septic shock. |
| Central nervous system | Glasgow Coma Scale | Decreased cerebral blood flow and oxygenation leads to a decreased level of consciousness. |
| Renal | Creatinine or urine output | Urine output under 0.5 mL/kg/hr is a sign of shock. Reduced renal perfusion → ischemia → acute tubular necrosis → acute renal failure. |
Sepsis-3 operationalizes sepsis as “an acute change in total SOFA score ≥ 2 points consequent to the infection.” Two practical points:
- Baseline SOFA is assumed to be 0 unless the patient is known to have preexisting organ dysfunction. A patient with chronic kidney disease may have a permanently elevated creatinine and a high baseline SOFA — the question is always what changed. Trend the numbers, do not read them in isolation.
- A SOFA ≥ 2 reflects an overall mortality risk of approximately 10%. That is the risk threshold Sepsis-3 chose — it is not a normal score.
SOFA-2 was published in October 2025: “Rationale and Methodological Approach Underlying the Development of the SOFA-2 Score: A Consensus Statement,” JAMA Netw Open 2025;8(10):e2545040 (DOI 10.1001/jamanetworkopen.2025.45040). It keeps the six organ systems but renames three of them — CNS → brain, hepatic → liver, coagulation → hemostasis — and adds variables the original score ignored: delirium requiring medication, noninvasive ventilation, high-flow nasal cannula, and ECMO, summed catecholamine doses, other vasopressors and inotropes, mechanical support devices, and renal replacement therapy.
What we do NOT know yet: it is not verified whether SSC 2026 formally adopts SOFA-2 for the sepsis definition. SSC 2026 still references the Sepsis-3 ≥ 2-point threshold. Treat SOFA-2 as an emerging development — do not assume it is the current exam standard or the standard at your clinical site, and do not apply its thresholds as if they were Sepsis-3.
The stages of shock — what you will actually see
| Stage | What is happening | What you see |
|---|---|---|
| I — Nonprogressive (compensated) | Early changes at the cellular level; compensatory mechanisms sustain hemodynamics | No obvious signs or symptoms — relatively normal vital signs and tissue perfusion. This is the stage you can only catch by looking for it. |
| II — Progressive (decompensating) | Compensatory mechanisms begin to fail; circulatory and metabolic derangements become pronounced | Decreased LOC · decreased pulse pressure (systolic falls, diastolic rises from vasoconstriction) · tachycardia, possibly exceeding 150 beats/min · weak, thready pulse · pale, cyanotic, cool, clammy, mottled skin · capillary filling time exceeding 3 seconds · decreased urine output · increased respiratory rate, rales/rhonchi · decreased or absent bowel sounds, possible paralytic ileus |
| III — Irreversible | A vicious cycle: cardiac failure, acidosis, coagulopathy, and failing cerebral perfusion | Acidosis impairs contractility and lowers cardiac output further; loss of vasomotor tone causes fluid shift and relative hypovolemia; disseminated intravascular coagulation; progression from drowsy and confused to coma and death |
Before the systolic pressure collapses, the pulse pressure narrows — ' 'systolic falls slightly while diastolic rises from compensatory vasoconstriction. ' 'Later, in the irreversible stage, the loss of vasomotor tone reverses that ' 'and the pressure falls catastrophically. A patient whose "blood pressure is still fine" but ' 'whose pulse pressure is closing is already in trouble.
Site first, then organism
You will rarely know the organism in the first hour. You will almost always be able to guess the site — and the site is what steers empiric coverage.
Common sites of infection
| Site | Why it matters clinically |
|---|---|
| Genitourinary tract | The most common cause of sepsis in the elderly. Often presents without localizing urinary symptoms — just confusion, hypotension, and a positive culture. Look for obstruction, which requires drainage. |
| Respiratory tract | Pneumonia is a leading source and a leading precipitant of ARDS. The two most common precipitants of ARDS are pneumonia and sepsis. |
| Wounds and skin/soft tissue | Surgical wounds and traumatic injuries — requires assessment for necrotizing infection, which is a surgical emergency. |
| Invasive devices | Peripheral catheters, central venous catheters, and urinary catheters. Any indwelling device is a candidate source, and removing it may be the definitive treatment. |
| Meninges | Consider in any patient with altered mental status and fever. |
| Gastrointestinal tract | Includes perforation, cholangitis, and colitis. Closed-space infections require drainage. |
Organisms
Common gram-negative bacilli
- Escherichia coli
- Klebsiella pneumoniae
- Enterobacter
- Proteus
- Pseudomonas
- Serratia
- Meningococci
Common gram-positive organisms
- Staphylococci — S. aureus, S. epidermidis, ' 'S. saprophyticus
- Streptococci — S. pyogenes, S. agalactiae, ' 'S. anginosus, S. faecalis, S. bovis, S. viridans, ' 'S. pneumoniae
- Clostridia — C. perfringens, C. tetani, ' 'C. difficile, C. botulinum
- Bacteroides
Also viral and fungal causes — do ' 'not let the bacterial list close your mind.
Predisposing factors — nosocomial infection in the critically ill
| Category | Factors |
|---|---|
| Host | Malnutrition · advanced age · immunosuppressive therapy (cytotoxics, corticosteroids) · neoplastic diseases · chronic diseases such as diabetes mellitus and renal failure |
| Exposure | Instrumentation with catheters and invasive procedures · trauma · surgical wounds · extended hospital stays |
When choosing empiric therapy, clinicians should be cognizant of the virulence and growing prevalence of MRSA and resistance to broad-spectrum β-lactams and carbapenems among gram-negative bacilli in some communities and healthcare settings. ' 'Within regions of highly prevalent drug-resistant organisms, empiric therapy adequate to cover these pathogens is warranted based on local antibiograms.
This is why the same diagnosis gets different antibiotics at different hospitals — ' 'and why "what does our antibiogram say" is a real clinical question, not a formality.
Cultures, lactate, and the source hunt
The diagnosis is clinical — suspected infection plus organ dysfunction. The laboratory work confirms it, grades its severity, and identifies the source.
| Test | What it shows |
|---|---|
| Lactic acid | A surrogate for hypoperfusion of cells and tissues, and a stratification tool in shock. Elevated levels after initial resuscitation are associated with increased mortality. Lactate may be influenced by complex processes and by factors including liver disease, malignancies, medications, and mitochondrial disease — so interpret it with the clinical picture. |
| Blood cultures | Bacteremia — although cultures may be negative. SSC 2026 (rec #7, upgraded to STRONG): collect cultures as soon as possible and ideally before antimicrobial therapy (strong, low certainty) — from two different sites, with 10 mL of blood per bottle. Two sets give 91.5–99.3% detection sensitivity. Positivity is 31.4% when drawn pre-antibiotic versus 19.4% post-antibiotic (median 70 min, IQR 50–110), so do not dawdle — but never delay antimicrobial therapy to obtain cultures, particularly with hypotension. |
| Not a sepsis rule: “three sets from three sites” | That is the endocarditis blood-culture rule, from a different chapter and a different disease. For sepsis and septic shock, the guidance is the two-site, 10 mL-per-bottle collection above. Do not import the endocarditis rule into a septic-shock resuscitation, where the clock wins. ⏱ The older “cultures before antibiotics if it delays therapy by less than 45 minutes” rule traces to SSC 2016; SSC 2021 carried it only as a best-practice statement in the rationale, not as a numbered recommendation. |
| CBC | Leukocytosis with a shift to the left — or leukopenia. WBC count is increased because of the body's response to stress or inflammation. |
| Platelet count | Thrombocytopenia ± DIC — decreased as a result of platelet aggregation and microemboli. |
| Procalcitonin | More than two standard deviations above normal. May be helpful with the decision to de-escalate antibiotic therapy. |
| C-reactive protein (CRP) | More than two standard deviations above normal. Also useful for de-escalation decisions. |
| Chest X-ray | To rule out pneumonia — the most common respiratory source. |
| Sputum Gram stain, culture and sensitivity | Identifies a respiratory source and permits narrowing. |
| Urinalysis, culture and sensitivity | Identifies a urinary source — and remember the genitourinary tract is the most common cause of sepsis in the elderly. |
| Wound or invasive catheter Gram stain, culture and sensitivity | As indicated — any indwelling device is a candidate source. |
| Radiographic studies | For concerns of infection such as intra-abdominal or intrathoracic sources and abscesses, as indicated. |
| Arterial blood gases | Hypoxemia; metabolic acidosis, often with compensatory respiratory alkalosis; worsening base deficit, which indicates inadequate tissue perfusion. |
These trends tell you the patient is losing ground, often before the blood pressure ' 'does:
- Glucose — increased early from sympathetic stimulation; ' 'decreased late from depletion of glycogen stores and decreased liver ' 'function
- Potassium — decreased early from aldosterone-driven renal ' 'excretion; increased late from acidosis shifting hydrogen into the cell and ' 'displacing potassium out, plus cell necrosis and falling renal function
- BUN and creatinine — increased from renal ischemia and acute ' 'tubular necrosis
- Total protein and albumin — decreased from capillary leakage and ' 'reduced hepatic synthesis
- Liver enzymes and bilirubin — initially increased from cell ' 'necrosis, then may decline with cell death while bilirubin remains elevated
- PT/PTT — may be prolonged with liver injury or endovascular ' 'injury such as DIC
- Urine output — under 0.5 mL/kg/hr; osmolality ' 'and specific gravity increased early as the kidneys compensate, then decreased when the ' 'kidney can no longer concentrate urine
⭐ Urine output of less than 0.5 mL/kg/hr is considered a sign of shock. In ' a 70 kg patient that is under 35 mL/hr. It is the earliest and most reliable bedside marker ' 'that renal perfusion has failed — and it is why hourly urine output is a monitored ' 'vital sign in these patients.
The Hour-1 bundle (2018), then everything that follows
Resuscitation begins before the diagnosis is certain. The initial resuscitation goals during the Hour-1 Bundle are five steps, and each is designed to be completed within the first hour of recognizing septic shock.
The five steps below are the Hour-1 Bundle from the 2018 SSC bundle update (Levy MM, Evans LE, Rhodes A. Crit Care Med 2018;46(6):997–1000). They are not the SSC 2021 recommendations and not the SSC 2026 recommendations. Neither the 2021 nor the 2026 guideline re-endorsed a “Hour-1 bundle” as a bundle. SSC 2021 replaced it with severity-stratified individual recommendations — different timing for different patients — and SSC 2026 kept that stratified approach.
Why the page still teaches it: Blessing & Sabol, Chapter 76, teaches the Hour-1 bundle as the course standard, and your preceptors may still run it as a “code sepsis” protocol. So learn it — but know that the current guidelines stratify by how sick the patient is, and the antibiotic-timing table in the next section is what SSC 2021 and SSC 2026 actually say. On an exam, answer with the stratification; in a hospital, follow the protocol your unit has adopted.
The Hour-1 Bundle (SSC 2018)
SSC 2026 treats the volume as a floor, not a ceiling: greater than 30 mL/kg of crystalloid may be needed to obtain the goal MAP, reverse global hypoperfusion (lactate clearance), or achieve regional organ-specific perfusion such as urine production — but 2026 explicitly emphasizes frequent ongoing reassessment to avoid the harms of under- OR over-resuscitation.
This is the single most important correction to the old Hour-1 framing: timing now depends on how likely sepsis is and whether there is shock. Both guidelines preserve the same split. Get this table into your head — it is the highest-yield thing on the page.
| Presentation | When to give antimicrobials | Strength |
|---|---|---|
| Possible septic shock, OR high likelihood of sepsis | Immediately, ideally within 1 hour of recognition | STRONG recommendation |
| Possible sepsis WITHOUT shock | Time-limited rapid assessment of infectious versus noninfectious causes. If concern for infection persists, antimicrobials within 3 hours of first recognition | CONDITIONAL (weak) recommendation |
| Probable or definite sepsis without shock — NEW emphasis in SSC 2026 | Elevated to immediately, ideally within 1 hour — the 3-hour window is for the genuinely uncertain patient, not for the patient who clearly has sepsis | STRONG recommendation in SSC 2026 |
| Low likelihood of infection and no shock | Defer antimicrobials while monitoring closely and continuing to work up alternative diagnoses | Conditional against immediate antimicrobials |
About 10–30% of patients initially treated for sepsis turn out to have a noninfectious diagnosis — pulmonary embolism, heart failure, pancreatitis, hemorrhage, autoimmune flare, tumor lysis, and others. Antibiotics are not free: they drive resistance, Clostridioides difficile, acute kidney injury, and cost.
So reassess daily and stop antibiotics if an alternative cause is found. The modern guideline position is not “antibiotics fast for everyone” — it is “antibiotics fast for the sick and the likely, a rapid workup for the uncertain, and a real off-ramp for the unlikely.”
Step 3 says antibiotics within the hour. Step 4 says 30 mL/kg of crystalloid. In a patient with heart failure, those two steps pull against each other.
The resolution: fluid is for sepsis-induced hypoperfusion or septic shock, not for everyone with sepsis. SSC 2026 leans hard on one word: reassessment. Reassess after each bolus — frequently and ongoing — because the harm runs in both directions: under-resuscitation leaves organs hypoperfused, and over-resuscitation causes pulmonary edema, gut congestion, and abdominal compartment syndrome. In a patient with known cardiac dysfunction, use a dynamic measure of fluid responsiveness, and escalate to vasopressors earlier rather than continuing to pour in volume.
Hemodynamic targets
| Target | Value | Notes |
|---|---|---|
| Mean arterial pressure | ≥ 65 mmHg — initial target 65 mmHg over higher targets (SSC 2026, strong, moderate). Practical framing: aim for a reasonable range around 65, e.g. within about 5 mmHg. | NEW in SSC 2026: for adults with septic shock aged 65 or older, suggest an initial MAP range of 60–65 mmHg over higher ranges (conditional, low certainty) — the age-tailored answer to “how low is too low?” The course textbook instead teaches “or higher in patients with underlying chronic hypertension”; the autoregulatory curve shifts upward in chronically hypertensive patients, so a “normal” MAP may be hypoperfusion for them. Know both framings — and know that SSC 2026 does not recommend routinely targeting a higher MAP. |
| Mixed venous oxygen saturation (SvO2) | > 65% | Consider using it as a perfusion target. SvO2 below 60% indicates tapped reserve; below 40% indicates anaerobic metabolism. |
| Central venous pressure | 8–12 mmHg (or 15 mmHg in mechanically ventilated patients, or those with abdominal distention or preexisting ventricular dysfunction) | Course textbook. SSC 2026: do NOT use CVP as the sole guide to fluid resuscitation — static filling pressures do not predict fluid responsiveness. Use the lowest CVP that achieves end-organ perfusion, and prefer dynamic measures: passive leg raise with stroke volume or cardiac output, a fluid bolus challenge with stroke volume change, SVV/PPV in mechanically ventilated patients, or POCUS of the IVC or ventricular outflow tract (VTI). |
| Urine output | > 0.5 mL/kg/hr | The bedside marker of regional organ perfusion. |
| Lactate clearance | Falling lactate on repeat measurement | The global marker of successful resuscitation. |
| Volume assessment | Fluid balance, urine output, CVP — plus the dynamic measures: passive leg raise with stroke volume/cardiac output, fluid bolus challenge with stroke volume change, SVV/PPV in mechanically ventilated patients, and POCUS of the IVC or VTI | Euvolemia is the goal, assessed frequently — not a single number. SSC 2026 explicitly warns against the harms of both under- and over-resuscitation. |
Vasopressors and inotropes
Course textbook: administration through a central line is preferred for all vasopressor and inotropic agents. SSC 2026: peripheral vasopressors are suggested over delaying initiation until central access is secured (conditional, very low certainty) — in the pooled data the extravasation complication rate was about 6%, and the harm of waiting usually exceeds the risk of a well-monitored peripheral line. Start the pressor; place the central line in parallel, not first.
| Drug | Dose | Place in therapy and cautions |
|---|---|---|
| Norepinephrine | Course textbook (Table 76.2): 2–40 mcg/min (0.01–0.5 mcg/kg/min). Increase or decrease rate by a minimum of 1 mcg/min at intervals no longer than every 30 minutes. Titration parameter: MAP; SBP. Usual target MAP > 65 or SBP 80–100. SSC 2026: norepinephrine is started at approximately 0.05 mcg/kg/min and titrated to effect. SSC does not publish a numeric dose range — the textbook’s 2–40 mcg/min is a reasonable local-protocol figure, not a guideline number. | Most potent vasoconstrictor. Drug of first choice for most types of shock and first-line vasopressor in septic shock, recommended over dopamine, epinephrine, or selepressin. SSC 2026 downgraded “norepinephrine first-line over vasopressin or angiotensin II” from strong to CONDITIONAL — norepinephrine is still first, but the evidence for strict sequencing is weaker than it once looked. Adverse effects: arrhythmias, tissue and myocardial ischemia. |
| Vasopressin | SSC: 0.03 units/min — a FIXED dose, NOT titrated. Course textbook (Table 76.2): 0.04 units/min. Know both numbers; use the SSC figure when answering guideline questions and your unit’s protocol at the bedside. | Adjunct therapy — add it to norepinephrine rather than using it as a replacement. Add it when norepinephrine is escalating, rather than continuing to escalate norepinephrine alone (conditional, moderate). When to start: SSC 2021 rationale suggested starting when norepinephrine reaches about 0.25–0.5 mcg/kg/min; in SSC 2026 the panelists initiated vasopressin at a median norepinephrine dose of 0.3 mcg/kg/min. Doses above 0.06 units/min are associated with cardiac, digital, and splanchnic ischemia — the textbook’s warning that doses above 0.04 units/min may lead to cardiac arrest is the same caution stated earlier. New in SSC 2026: septic shock with concomitant cardiac dysfunction → suggest either norepinephrine or epinephrine first-line (prefer norepinephrine with tachyarrhythmia, epinephrine with bradyarrhythmia). |
| Epinephrine | 1–10 mcg/min (0.01–0.2 mcg/kg/min). Increase or decrease by a minimum of 1 mcg/min at intervals no longer than every 5 minutes | Second-line or adjunct agent for refractory hypotension. First-line for cardiopulmonary resuscitation and anaphylactic shock. SSC 2026: in septic shock with concomitant cardiac dysfunction, epinephrine is an acceptable first-line alternative to norepinephrine — prefer epinephrine when the patient is bradyarrhythmic, and norepinephrine when tachyarrhythmic. Adverse effects: tachyarrhythmias, tissue ischemia, myocardial ischemia, hyperglycemia. |
| Dopamine | 0.5–20 mcg/kg/min, dose-dependent effects. Increase or decrease by a minimum of 1 mcg/kg/min at intervals no longer than every 30 minutes | Alternative pressor agent in select patients — for example depressed LV function or bradycardia. Dosage-dependent effects vary by individual and have not been reproduced in critically ill patients. Adverse effects: tachycardia, arrhythmias, myocardial ischemia. |
| Phenylephrine | 50–400 mcg/min (0.5–5 mcg/kg/min) | Not recommended in septic shock except in patients with serious dysrhythmias, high cardiac output states, or as salvage therapy. Adverse effects: reflex bradycardia, decreased renal perfusion. Caution in renal impairment. |
| Angiotensin II (Giapreza) | 20 ng/kg/min; titrate every 5 minutes in increments of up to 15 ng/kg/min. Maximum 80 ng/kg/min in the first 3 hours; maximum maintenance 40 ng/kg/min | For persistent hypotension despite fluid and pressor therapy in septic or other distributive shock. Limited data to support routine use — one published trial. Adverse effect: VTE (DVT). |
| Drug | Dose | Place in therapy and cautions |
|---|---|---|
| Dobutamine | 2.5–20 mcg/kg/min; increase or decrease by 1 mcg/kg/min at intervals no longer than every 30 minutes. Titration parameter: CO; CI | Preferred vasoactive agent to treat cardiogenic shock with low output and increased afterload. ⭐ Septic shock with myocardial dysfunction may require norepinephrine PLUS dobutamine. Use for persistent hypoperfusion despite adequate fluid loading and vasopressors. Higher doses may be required for patients previously on β-blockers. Adverse effects: arrhythmogenic, may potentiate hypokalemia, myocardial ischemia, hypotension/vasodilation. |
| Milrinone | Loading dose 50 mcg/kg over 10 minutes, then continuous infusion 0.125–0.75 mcg/kg/min. Titration parameter: CO; CI | Adverse effects: arrhythmogenic, thrombocytopenia, myocardial ischemia, hypotension/vasodilation. The loading dose is frequently omitted. Reduce the dose for renal impairment. Requires slower titration than dobutamine. |
SSC 2021 suggested invasive arterial monitoring over noninvasive. SSC 2026 reversed that: either invasive OR noninvasive blood-pressure monitoring is acceptable for adults with septic shock. Translation for clinicals: an arterial line is useful — it gives you beat-to-beat pressure and access for frequent labs — but it is not required to start or titrate vasopressors, and lack of a line is not a reason to delay them. A well-fitted cuff with the correct cuff size is acceptable.
Antimicrobial therapy — the specifics
- Timing is severity-stratified, not a blanket “within the hour.” See the table above: shock or high likelihood → immediately, ideally within 1 hour (strong); possible sepsis without shock → rapid assessment, then within 3 hours (conditional); probable or definite sepsis without shock → within 1 hour (strong, new in SSC 2026); low likelihood and no shock → defer. Course textbook: effective IV antimicrobials within the first hour of recognition of shock — consistent with the shock arm above.
- Empiric antibiotics include combination therapy of at least two antibiotics of different antimicrobial classes aimed at the most likely bacterial pathogen(s).
- Duration — the honest correction. Course textbook and SSC 2016: “antimicrobial duration of 7–10 days is adequate for most serious infections associated with septic shock.” There is no numeric 7–10 day recommendation in SSC 2021 or SSC 2026. The current position is “shorter over longer” duration when source control is adequate (weak), with daily assessment for de-escalation rather than a fixed calendar (weak).
- De-escalation — upgraded in SSC 2026. Recommendations #36–37 make de-escalation when a pathogen and its susceptibilities are available a STRONG recommendation, and also recommend de-escalating even when no pathogen is identified (conditional). Narrow when you can; stop when the source is controlled and the patient is clearly improving.
- Closed-space infections — abscess, infected bowel, infected uterus, inflamed gallbladder — require surgical drainage; antibiotics alone will not sterilize them, and duration follows adequacy of source control rather than a fixed number of days.
- Empiric antifungal therapy — SSC 2026 REVERSES SSC 2021. SSC 2026 suggests AGAINST empirical antifungal therapy for sepsis or septic shock (conditional, low certainty). SSC 2021 had suggested empiric antifungals in patients at high risk of fungal infection. The 2026 remark: consider it case by case with immunosuppression, prolonged antibiotics, prolonged hospitalization, or an intra-abdominal source.
- Anaerobic coverage — new in SSC 2026. Suggest without anaerobic coverage if there are no risk factors; with it if risk factors are present: intra-abdominal or deep-seated gynecologic/obstetric source, necrotizing soft-tissue infection, head and neck infection, empyema, or CNS abscesses.
- Procalcitonin levels can be considered to support early discontinuation of antibiotics in patients with limited clinical evidence of infection.
- Reassess every treated patient for a noninfectious diagnosis. About 10–30% turn out not to have infection. Reassess daily and stop antibiotics if an alternative cause is found.
- In immunosuppressed patients, antibiotic coverage for atypical pathogens is recommended.
- Consider local resistance: MRSA and carbapenem-resistant gram-negative bacilli.
Corticosteroids — the criteria have changed
Course textbook: IV hydrocortisone is not routine; consider it when fluids and vasopressors fail to restore stability and adrenal insufficiency is suspected. That is the cautious framing, and it remains true that corticosteroids are not given to every patient with sepsis.
SSC 2021: suggested IV corticosteroids for septic shock with an ongoing vasopressor requirement — hydrocortisone 200 mg/day, given as 50 mg IV every 6 hours or as a continuous infusion, suggested to start at norepinephrine or epinephrine ≥ 0.25 mcg/kg/min at least 4 hours after initiation. No ACTH stimulation test to select patients.
SSC 2026 BROADENED this to all septic shock (conditional, low certainty): the vasopressor threshold is gone, and the decision is left to clinical judgment rather than a dose trigger. The dose and route are unchanged — hydrocortisone 200 mg/day, 50 mg IV every 6 hours or as a continuous infusion, tapered when vasopressors are no longer required. Still no ACTH stimulation testing to decide who gets treated.
Why the panel moved: in 45 RCTs, n = 9,543, corticosteroids produced a 28-day mortality RR 0.92 (95% CI 0.83–1.01) — a signal that does not quite exclude no benefit — but shock reversal at 7 days RR 1.29 (95% CI 1.13–1.46, HIGH certainty). The harms are real and measurable: hyperglycemia (RR 1.19) and hypernatremia (RR 1.64). So the trade is faster shock reversal and more glucose/sodium problems, not a proven mortality benefit.
Everything else in the resuscitation
| Domain | What to do |
|---|---|
| Airway and ventilation | Maintain airway and ventilation. Continuous O2 saturation via pulse oximetry and judicious ABGs. Administer supplemental O2 for treatment or prevention of hypoxemia. Mechanical ventilation may be necessary to facilitate adequate gas exchange. |
| Fluid choice | Crystalloids remain first-line (SSC 2026, strong) in resuscitation of severe sepsis and septic shock — inexpensive, convenient, and relatively free of adverse effects, but rapidly distributed across intravascular and interstitial spaces. Normal saline usually requires volumes 2–4 times that of colloid for an equivalent hemodynamic response, and large-volume resuscitation can cause hyperchloremic metabolic acidosis. SSC 2026 suggests balanced crystalloids over 0.9% saline (conditional, moderate) — exception: sepsis with traumatic brain injury, where 0.9% saline is preferred. Do NOT use hydroxyethyl starch (strong, high certainty) or gelatin (conditional). Albumin — a reversal to flag: course textbook and SSC 2021 suggested considering albumin after substantial crystalloid volumes. SSC 2026 suggests crystalloids ALONE over crystalloids plus supplemental albumin (conditional, moderate). If albumin is used, monitor for pulmonary edema, coagulopathies, and anaphylaxis. |
| Acid–base | Metabolic acidosis usually self-corrects with resuscitation and restored hemodynamics. In severe cases (pH < 7.10), CVVHD may be needed or NaHCO3 given to raise pH to 7.20–7.25 — although bicarbonate remains controversial. Overcorrection may precipitate alkalosis. Respiratory acidosis may be corrected with mechanical ventilation; mild permissive hypercapnia is a lung-protective strategy in ARDS, keeping plateau pressure < 30 cm H2O. |
| Source control | Course textbook: surgical treatment may be necessary to correct the underlying etiology — hemorrhage, valvular disease, resection of an obstructive tumor, or infectious source control. In urosepsis this means relieving obstruction; in an abscess it means drainage. SSC 2021 (strong): rapidly identify or exclude an anatomical diagnosis requiring emergent source control and implement it as soon as medically and logistically practical, plus prompt removal of intravascular access devices that are a possible source once other access is established. SSC 2026 rec #24 (NEW): suggest early source control over late source control, ideally within 6 hours of diagnosis of sepsis or septic shock requiring source control (conditional, very low certainty). Common foci: intra-abdominal abscess, peritonitis from GI perforation, cholangitis/cholecystitis, pelvic abscess, obstructed or abscessed pyelonephritis, necrotizing soft-tissue infection, empyema, septic arthritis, and device/catheter infections. |
| Nutrition | Patients in shock require increased caloric intake because of the stress state, in which nutritional stores are depleted and protein catabolism occurs. Early nutritional support preserves GI immune and defense function, preventing bacterial and endotoxin translocation. Consider delaying or providing trickle administration for those with high pressor requirements, and in severe shock wait for the pressor requirement to decrease. |
| Temperature | Antipyretics and cooling blankets help reduce body temperature and metabolic demands. |
| Monitoring | Hemodynamic monitoring — arterial line, pulmonary artery catheter, echocardiogram, and continuous real-time non-invasive hemodynamic monitoring — is a critical tool for assessment, giving information about fluid status, cardiac contractility, and the effectiveness of vasoactive agents. |
The first hour, then the escalation
Algorithm 1 — Recognize, screen, and start the clock
Algorithm 2 — Which vasoactive drug, and when
Norepinephrine — start it.
- Textbook dose: 2–40 mcg/min (0.01–0.5 mcg/kg/min). SSC: started at about 0.05 mcg/kg/min and titrated — SSC publishes no numeric range
- Titrate to MAP around 65 (SSC 2026: 65 over higher targets; initial 60–65 mmHg if age ≥ 65)
- Most potent vasoconstrictor; first choice for most types of shock
- Peripheral vasopressors are suggested over delaying for central access (SSC 2026, conditional) — start the drug, place the line in parallel
- Either invasive or noninvasive BP monitoring is acceptable (SSC 2026 reversed 2021)
Add vasopressin as an adjunct — not a replacement.
- 0.03 units/min (SSC) — fixed dose, not titrated; textbook Table 76.2 prints 0.04 units/min
- Add it while norepinephrine is escalating rather than continuing to escalate norepinephrine alone — SSC 2021 rationale suggested starting around 0.25–0.5 mcg/kg/min of norepinephrine; SSC 2026 panelists started at a median of 0.3 mcg/kg/min
- Doses above 0.06 units/min are associated with cardiac, digital, and splanchnic ischemia
- Epinephrine 1–10 mcg/min is the alternative adjunct for ' refractory hypotension — and in septic shock with cardiac dysfunction, either norepinephrine or epinephrine is acceptable first-line
Think myocardial dysfunction rather than vasoplegia.
- Add dobutamine 2.5–20 mcg/kg/min
- ⭐ Septic shock with myocardial dysfunction may require norepinephrine PLUS ' dobutamine
- Dobutamine is for persistent hypoperfusion despite adequate fluid loading and ' 'vasopressors
- Higher doses needed if the patient was previously on β-blockers
Consider the second-line and emerging options, and re-examine the source.
- Hydrocortisone 200 mg/day (50 mg IV q6h or continuous infusion). SSC 2021: with an ongoing vasopressor requirement and norepinephrine/epinephrine ≥ 0.25 mcg/kg/min for at least 4 hours. SSC 2026: broadened to all septic shock, by clinical judgment — no dose threshold. No ACTH stimulation testing
- Angiotensin II — persistent hypotension despite fluid and pressor ' 'therapy; limited data, VTE risk
- Phenylephrine is not recommended in septic shock except for serious ' 'dysrhythmias, high cardiac output states, or salvage
- Ask again: is the source drained? — SSC 2026: early source control, ideally within 6 hours of diagnosis
- Waiting for cultures or imaging before antibiotics. In shock or likely ' 'sepsis the antibiotics go in within the hour; in possible sepsis without ' 'shock you have a 3-hour window to sort it out, and in low-likelihood ' 'patients with no shock you defer antibiotics and keep looking. Blood ' 'cultures first only if it causes no significant delay — the two-site, 10 mL ' 'draw takes minutes, the imaging can wait.
- Continuing fluid instead of starting a pressor. Fluids and vasopressors ' 'are paired, not sequential forever. SSC 2026 emphasizes frequent reassessment in both ' 'directions: too little volume leaves organs hypoperfused, too much causes pulmonary edema, ' 'gut congestion, and abdominal compartment syndrome.
- Never re-examining the source. A patient not improving on appropriate ' 'antibiotics usually has an undrained collection or an obstructed system. ' 'No antibiotic reaches an abscess or an obstructed kidney — get source control early, 'ideally within 6 hours.
Sepsis beside the other three
Antibiotic coverage across the four topics
| Topic | Timing | Spectrum | Duration |
|---|---|---|---|
| Sepsis | 1 hour if shock or high likelihood (strong); 3 hours if possible sepsis without shock (conditional); 1 hour if probable/definite sepsis without shock (SSC 2026, strong); defer if low likelihood and no shock | Broad, at least two classes, per local antibiogram | No numeric duration in SSC 2021/2026 — shorter over longer when source control is adequate, with daily reassessment for de-escalation. The textbook’s “7–10 days” is SSC 2016 language |
| Pneumonia | Prompt; not a formal 1-hour target in stable CAP | Setting-dependent: macrolide or doxycycline in the healthy outpatient, up to antipseudomonal β-lactam ± MRSA coverage in HAP/VAP | 5–7 days CAP; 7 days HAP/VAP, extended only for failure to improve |
| UTI | Prompt; 1-hour target applies if the UTI has become urosepsis | Site-dependent: nitrofurantoin/TMP-SMX/fosfomycin for cystitis up to broad coverage per antibiogram for complicated infection | 3–5 days cystitis; 7 days pyelonephritis outpatient; up to 14 days if severely ill |
| CHF | Not applicable unless infection coexists | Not applicable — the treatment is diuresis, vasodilation, and neurohormonal blockade | Not applicable |
Fluid: the same intervention, opposite indications
| Situation | Volume goal | Reasoning |
|---|---|---|
| Septic shock | Give it. 30 mL/kg IV crystalloid within the first 3 hours for sepsis-induced hypoperfusion or septic shock (SSC 2026, conditional, low certainty). | Distributive shock with vasodilation, venous pooling, and relative hypovolemia — even though total body water may be normal or high. |
| Septic shock with heart failure | Give it carefully, reassess often, escalate pressors earlier. | The failing ventricle tolerates a large bolus poorly. Use bedside IVC or dynamic measures of fluid responsiveness; the guideline bundle is a starting point, not a mandate. |
| Warm & wet heart failure | Remove it. IV loop diuretic first. | Congested and perfusing. A fluid bolus here causes pulmonary edema. |
| Cold & wet heart failure | Inotrope first, diuretic after. | Perfusion is the problem. Diuresing a hypoperfused patient worsens renal function and blood pressure. |
| Cardiogenic pulmonary edema | Remove volume; reduce preload. | Except with aortic stenosis, HOCM, or pulmonary hypertension — those patients are preload-dependent. |
A 76-year-old with heart failure, an indwelling urinary catheter, and a new fever who becomes ' 'hypotensive and confused. This patient has all three of the other topics ' 'operating at once:
- UTI — the likely source; check for obstruction and exchange the ' 'catheter
- Pneumonia — the other common source; get a chest radiograph, and ' 'remember the infiltrate may lag 24–48 hours
- Heart failure — which makes the fluid resuscitation dangerous and ' 'the lactate harder to interpret
Sepsis is the frame that organizes them. The source hunt comes first, ' 'resuscitation and the antibiotics run while you hunt — in shock or probable ' 'sepsis, within the hour; if it is still “possible” sepsis without shock, you have ' 'a 3-hour window to clarify — and the heart failure modifies how you deliver the volume ' '— not whether you treat the sepsis.
⭐ The two most common precipitants of ARDS are pneumonia and sepsis. The ' 'clinical signature is refractory hypoxemia during the course of an inciting ' 'event, with bilateral infiltrates and no left-atrial hypertension ' '(PCWP < 18).
⭐ Lungs often sound clearer than the chest X-ray would suggest. And the ' 'diagnostic thresholds carry over: PaO2/FiO2 < 300 is acute ' 'lung injury; < 200 is ARDS. Mortality remains nearly 40%.
The treatment bridge is the same three moves as sepsis — early resuscitation, ' 'appropriate antibiotics, and source control — plus lung-protective ' 'ventilation: tidal volume 6 mL/kg predicted body weight, plateau ' 'pressure < 30 cm H2O, and permissive hypercapnia with bicarbonate repletion.
The facts to carry into clinicals, with provenance attached
- Sepsis = life-threatening organ dysfunction from a dysregulated host response to ' 'infection. Infection without organ dysfunction is not sepsis.
- SIRS criteria were abandoned in 2016 with the Sepsis-3 definition. Sepsis ' 'is now defined by organ dysfunction, not inflammation. There is no ' '“Sepsis-4” — Sepsis-3 is still operative, and Sepsis-3 retired ' 'severe sepsis as redundant (the ladder is sepsis → septic shock).
- qSOFA: respiratory rate ≥ 22/min, altered mentation, systolic blood ' 'pressure ≤ 100 mmHg. Two or more points means look harder — but do not ' 'screen with it alone. SSC 2021 recommended strongly against qSOFA ' 'as a single screening tool; SSC 2026 positively prefers NEWS, NEWS2, MEWS, or ' 'SIRS (strong, moderate). qSOFA sensitivity was only 23.1% in ' '> 221,000 prehospital patients.
- SOFA tracks six systems: respiration, coagulation, liver, cardiovascular, ' 'CNS, and renal. Sepsis is an acute change in total SOFA ≥ 2 points consequent to ' 'the infection; baseline SOFA is assumed to be 0 unless preexisting ' 'organ dysfunction is known, and a SOFA ≥ 2 means roughly a 10% mortality ' 'risk. SOFA-2 (2025) exists but is not verified as ' 'what SSC 2026 uses — do not treat it as the current exam standard.
- Septic shock is distributive — the only shock state with ' 'low SVR and high cardiac output. Warm and vasodilated early, which is why ' 'it can look deceptively well perfused. Exact criteria: vasopressors needed ' 'to keep MAP ≥ 65 mmHg and lactate > 2 mmol/L, without hypovolemia; hospital ' 'mortality > 40%.
- Genitourinary infection is the most common cause of sepsis in the elderly ' '— and often presents without urinary symptoms.
- The Hour-1 Bundle is a 2018 document (SSC bundle update), not SSC 2021 or ' '2026. Five steps: measure lactate (remeasure if > 2), obtain blood cultures, give ' 'broad-spectrum antibiotics, begin 30 mL/kg crystalloid, and apply ' 'vasopressors to keep MAP ≥ 65 mmHg. Your textbook teaches it; the ' 'current guidelines replaced it with severity-stratified recommendations.
- Antibiotics: shock or high likelihood → immediately, ideally within 1 hour ' '(strong). Possible sepsis without shock → rapid assessment, then within 3 hours ' '(conditional). Probable/definite sepsis without shock → 1 hour (strong, new in SSC ' '2026). Low likelihood and no shock → defer. Blood cultures: two sites, 10 mL ' 'per bottle, ideally before antibiotics — but never delay antibiotics for ' 'them.
- Norepinephrine is the first-choice vasopressor (SSC 2026 downgraded the ' 'sequencing claim to conditional). Textbook dose 2–40 mcg/min; SSC starts around ' '0.05 mcg/kg/min and titrates — SSC publishes no numeric range. ' 'Vasopressin is a FIXED 0.03 units/min (textbook ' 'prints 0.04), added while norepinephrine escalates — often around 0.25–0.5 ' 'mcg/kg/min of norepinephrine, median 0.3 in SSC 2026 — and doses above 0.06 ' 'units/min cause cardiac, digital, and splanchnic ischemia. Peripheral pressors are ' 'suggested over waiting for central access, and invasive or noninvasive BP monitoring ' 'are both acceptable.
- Fluids: crystalloids first-line (strong); balanced crystalloids ' 'over 0.9% saline, except in traumatic brain injury; do not use ' 'hydroxyethyl starch or gelatin; SSC 2026 suggests crystalloids alone over ' 'crystalloid plus albumin (reversing 2021). Weight-based volume uses actual body ' 'weight — adjusted/ideal if BMI > 30. Do not use CVP alone; prefer ' 'dynamic measures.
- Do not use phenylephrine in septic shock except for serious dysrhythmias, ' 'high cardiac output states, or salvage therapy.
- Septic shock with myocardial dysfunction may require norepinephrine plus ' 'dobutamine — and SSC 2026 allows either norepinephrine or ' 'epinephrine first-line in that setting.
- Hydrocortisone 200 mg/day (50 mg IV q6h or infusion), no ACTH stimulation ' 'test. SSC 2021: ongoing vasopressor requirement at norepinephrine/epinephrine ' '≥ 0.25 mcg/kg/min for ≥ 4 hours. SSC 2026: broadened to all septic ' 'shock by clinical judgment — shock reversal improves (RR 1.29, high ' 'certainty); mortality benefit is unproven (RR 0.92, CI 0.83–1.01); hyperglycemia and ' 'hypernatremia increase.
- Urine output under 0.5 mL/kg/hr is a sign of shock. Capillary refill ' 'beyond 3 seconds and a narrowing pulse pressure are early warning signs.
- Closed-space infections require drainage — SSC 2026 suggests early ' 'source control, ideally within 6 hours of diagnosis. Antibiotics alone ' 'cannot cure an abscess, an infected gallbladder, or an obstructed infected kidney.
- SSC 2026 suggests AGAINST empiric antifungals (reversing SSC 2021), and ' 'suggests anaerobic coverage only with risk factors (intra-abdominal, ' 'deep-seated gynecologic/obstetric, necrotizing soft-tissue, head/neck, empyema, CNS ' 'abscess).
- There is no numeric antibiotic duration in SSC 2021/2026. Use ' 'shorter over longer when source control is adequate, reassess ' 'daily for de-escalation (a STRONG recommendation in SSC 2026 when a pathogen and ' 'susceptibilities are available), and stop antibiotics if a noninfectious diagnosis ' 'emerges — 10–30% of treated patients turn out not to have infection. ' 'The textbook’s “7–10 days” is SSC 2016 language.
- Waiting for confirmation. Sepsis is a clinical diagnosis — “should not be ruled in or out using a single biomarker or diagnostic test” (SSC 2026) — and the clock starts when you suspect it, not when the culture returns. Match the timing to the presentation: 1 hour if shock, high likelihood, or probable/definite sepsis; 3 hours if possible sepsis without shock; defer if unlikely and not in shock.
- Fluids indefinitely, or fluids not at all. Volume and vasopressors are paired, and SSC 2026 emphasizes reassessment to avoid both harms. In cardiac dysfunction, more volume causes pulmonary edema; in under-resuscitated sepsis, less volume leaves organs ischemic.
- Forgetting source control. If the patient is not improving on appropriate ' 'antibiotics, the question is what is still undrained or obstructed — not which ' 'antibiotic is next. SSC 2026 suggests source control ideally within 6 hours of diagnosis.
Six questions, then reveal
Answer out loud before opening each one.
A 68-year-old man is admitted with pneumonia. His respiratory rate is 24/min, he is oriented, and his systolic blood pressure is 96 mmHg. What does his qSOFA score tell you?
He screens positive — 2 points (respiratory rate ≥ 22/min; systolic blood pressure ≤ 100 mmHg). Mental status is normal, so no point there.
qSOFA is a prompt to escalate concern and look harder for organ dysfunction in a patient with suspected infection. It is not a diagnostic test and not sensitive enough to screen with alone: SSC 2021 recommended strongly against qSOFA as a single screening tool, and SSC 2026 goes further, recommending NEWS, NEWS2, MEWS, or SIRS over qSOFA (strong, moderate certainty). qSOFA’s sensitivity was only 23.1% in a study of more than 221,000 prehospital patients — so a score of 0 or 1 would not have excluded sepsis here either. Move on to assess organ dysfunction formally: lactate, platelets, bilirubin, creatinine and urine output, oxygenation, and Glasgow Coma Scale.
Which hemodynamic pattern distinguishes septic shock from the other classes of shock?
Low systemic vascular resistance with a high cardiac output. Septic shock is a distributive shock state: vasodilation and loss of vasomotor tone cause venous pooling and relative hypovolemia. Preload and PAWP fall, cardiac output rises, and SVR falls markedly.
Hypovolemic, cardiogenic, and obstructive shock all feature a low cardiac output with vasoconstriction. That is why a septic patient may feel warm with bounding pulses while their organs are hypoperfused — and why you cannot judge the adequacy of resuscitation by how the patient feels.
A patient in septic shock has a lactate of 5.2 mmol/L and a MAP of 58 mmHg after 30 mL/kg of crystalloid. What are the next steps?
Start norepinephrine and titrate to MAP ≥ 65 mmHg. Also remeasure the lactate — a lactate above 2 mmol/L must be repeated, because lactate clearance is the global marker of successful resuscitation.
Norepinephrine is the first-choice vasopressor: the textbook prints 2–40 mcg/min (0.01–0.5 mcg/kg/min), while SSC 2026 describes starting at about 0.05 mcg/kg/min and titrating (SSC publishes no numeric range). If he remains hypotensive, add vasopressin 0.03 units/min as an adjunct — a fixed, non-titrated dose (the textbook table prints 0.04 units/min), added when norepinephrine is escalating rather than continuing to escalate norepinephrine alone, often around a norepinephrine dose of 0.25–0.5 mcg/kg/min (median 0.3 in SSC 2026). Doses above 0.06 units/min are associated with cardiac, digital, and splanchnic ischemia. Note also that the goal MAP is 65 mmHg over higher targets — and 60–65 mmHg initially if he is 65 or older (SSC 2026). The textbook’s “higher if chronically hypertensive” framing is the older alternative.
A patient in septic shock remains hypotensive despite adequate fluid resuscitation and high doses of norepinephrine and vasopressin. Should you give hydrocortisone?
Consider it — and note how the criteria have changed. Course textbook: IV hydrocortisone is not routine; consider it when fluids and vasopressors fail to restore stability and adrenal insufficiency is suspected. SSC 2021: give it for septic shock with an ongoing vasopressor requirement — suggested at norepinephrine or epinephrine ≥ 0.25 mcg/kg/min for at least 4 hours — as hydrocortisone 200 mg/day (50 mg IV every 6 hours or continuous infusion), tapered when vasopressors are no longer required. SSC 2026: broadened to all septic shock, with the decision left to clinical judgment rather than a dose threshold (conditional, low certainty).
No ACTH stimulation test is used to select patients. This patient has an ongoing vasopressor requirement, so he qualifies — but also re-examine whether there is an undrained source, because refractory shock is often a source-control problem. The trade-off to know: shock reversal improves at 7 days (RR 1.29, high certainty), mortality benefit is not proven (RR 0.92, CI 0.83–1.01), and hyperglycemia and hypernatremia increase.
A patient with a urinary catheter and known heart failure develops urosepsis with a MAP of 56 mmHg and a lactate of 4.8 mmol/L. How do you reconcile the sepsis bundle with the heart failure?
Run the resuscitation, but deliver the fluid with reassessment and escalate vasopressors earlier. She meets the criteria for 30 mL/kg of crystalloid within the first 3 hours (SSC 2026) — sepsis-induced hypoperfusion with a lactate ≥ 4 — but the failing ventricle tolerates a large bolus poorly.
Use smaller boluses with reassessment after each one, and assess fluid responsiveness dynamically: passive leg raise with stroke volume or cardiac output, SVV/PPV if she is mechanically ventilated, IVC or VTI on POCUS, or a fluid bolus challenge — not CVP alone. If she is not responding, start norepinephrine rather than continuing to pour in volume — fluid overload in a failing heart becomes pulmonary edema and worsens organ dysfunction. Do not withhold treatment of the sepsis because of the heart failure; modify how you deliver it.
A patient with urosepsis has been on appropriate IV antibiotics for 48 hours but remains febrile and hypotensive. What must you consider?
An undrained source — specifically urinary obstruction or abscess. Closed-space infections require surgical drainage and perhaps a longer antibiotic course. In urosepsis, that means relieving obstruction with a nephrostomy tube or ureteral stent, or exchanging a chronically indwelling catheter that has become a biofilm reservoir.
An infected obstructed collecting system is under pressure: no antibiotic reaches it adequately, and the kidney is destroyed while you wait. Rather than broadening coverage reflexively, obtain imaging and get a urology consult — SSC 2026 suggests early source control, ideally within 6 hours of diagnosis (conditional, very low certainty). The same logic applies to any closed-space infection — abscess, infected bowel, infected uterus, or inflamed gallbladder. And note the duration point: source control, not a fixed number of days, is what determines how long antibiotics run — shorter over longer when source control is adequate, with daily reassessment for de-escalation.
Sources
Every clinical statement on this page traces to one of the sources below. Course readings are cited by chapter so you can find the original; guidelines are cited by year and issuing body so you can check whether a newer version has appeared.
Blessing, R., & Sabol, V. K. (2021). Management of the patient in shock (Chapter 76). In Practice considerations for adult-gerontology acute care nurse practitioners (3rd ed.). The primary source for this report and the one page in the textbook that treats sepsis directly. Source of the Sepsis-3 definitions as taught in the course, the abandonment of SIRS, the qSOFA criteria, the classification of shock (hypovolemic, cardiogenic, obstructive, distributive), the hemodynamic parameter table, the three stages of shock, the laboratory findings, the Hour-1 Bundle elements, the textbook hemodynamic targets, Table 76.2 (vasopressor agents) and Table 76.3 (inotropic agents) with doses and cautions, the textbook corticosteroid criteria, the 7–10 day antimicrobial duration, the common organisms, the predisposing factors and common sites of infection, and the nutritional and acid–base management guidance. Provenance note: the textbook’s Hour-1 Bundle derives from the 2018 SSC bundle update and its 7–10 day duration from SSC 2016 — both are SSC 2016/2018-era teaching. This report keeps them, labeled, beside the current guideline positions, because your course and your preceptors still use them.
Levy, M. M., Evans, L. E., & Rhodes, A. (2018). The Surviving Sepsis Campaign bundle: 2018 update. Critical Care Medicine, 46(6), 997–1000. The source of the Hour-1 Bundle taught in this report and in Chapter 76. It is a 2018 document. SSC 2021 did not re-endorse it as a bundle — it replaced it with severity-stratified individual recommendations — and SSC 2026 preserved that stratified approach.
Chapter 81 — Other infections. Additional infectious-disease context for organism identification and antimicrobial therapy.
Chapters 42 and 43 — Urinary tract infections and Acute kidney injury and chronic kidney disease. Source of the urosepsis pathway: the genitourinary tract as the most common cause of sepsis in the elderly, the persistent-fever-after-3-to-4-days red flag prompting investigation for obstruction or abscess, and the renal consequences of hypoperfusion (acute tubular necrosis).
Chapter 30 — Respiratory failure, and Chapter 27. Source of the ARDS overlap: pneumonia and sepsis as the two most common precipitants, refractory hypoxemia, bilateral infiltrates with PCWP < 18, the PaO2/FiO2 thresholds, and the lung-protective ventilation targets.
Chapter 23 — Measures of oxygenation and ventilation. Source of the SvO2 interpretation used in the hemodynamic targets (normal 75%, range 60–80%; below 60% indicates tapped reserve; below 40% indicates anaerobic metabolism) and the PCWP-versus-PAP distinction.
Singer, M., Deutschman, C. S., Seymour, C. W., et al. (2016). The Third International Consensus Definitions for Sepsis and Septic Shock (Sepsis-3). JAMA, 315(8), 801–810. The consensus statement that produced the definition quoted on this page: sepsis as “an acute change in total SOFA score ≥ 2 points consequent to the infection,” baseline SOFA assumed to be 0 unless preexisting organ dysfunction is known, SOFA ≥ 2 corresponding to roughly 10% mortality, the vasopressor-plus-lactate criteria for septic shock (> 40% hospital mortality), and the retirement of SIRS and of the term severe sepsis. Still operative — there is no “Sepsis-4.”
Prescott, H. C., Antonelli, M., Alhazzani, W., et al. (2026). Surviving Sepsis Campaign: International Guidelines for Management of Sepsis and Septic Shock 2026. Critical Care Medicine, 54, 725–812. DOI 10.1097/CCM.0000000000007075 (published 23 March 2026). The current authority and the source of the newest positions on this page: severity-stratified antimicrobial timing, with probable/definite sepsis without shock moved to the 1-hour STRONG recommendation; blood cultures strongly recommended ideally before antimicrobials (two sites, 10 mL per bottle); at least 30 mL/kg crystalloid within the first 3 hours (conditional, low certainty) with frequent reassessment; an initial MAP of 60–65 mmHg for patients aged 65 or older; norepinephrine-versus-vasopressin sequencing downgraded to conditional, with vasopressin fixed at 0.03 units/min; peripheral vasopressors preferred over delaying for central access; either invasive or noninvasive blood-pressure monitoring; corticosteroids broadened to all septic shock; the positive preference for NEWS/NEWS2/MEWS/SIRS over qSOFA as a single screening tool; early source control ideally within 6 hours; and the reversals on empiric antifungals (against) and albumin (crystalloids alone).
Evans, L., Rhodes, A., Alhazzani, W., et al. (2021). Surviving Sepsis Campaign: International Guidelines for Management of Sepsis and Septic Shock 2021. Critical Care Medicine, 49(11), e1063–e1143. Superseded by SSC 2026, but essential to this page because it is the guideline that replaced the Hour-1 Bundle with severity-stratified recommendations (1 hour for possible septic shock or high likelihood of sepsis, strong; 3 hours for possible sepsis without shock, conditional; defer when infection is unlikely and there is no shock), issued the strong recommendation against qSOFA as a single screening tool, set the corticosteroid threshold (norepinephrine or epinephrine ≥ 0.25 mcg/kg/min for at least 4 hours), suggested balanced crystalloids over saline, and made daily assessment for de-escalation — rather than a fixed duration — the duration guidance.
SOFA-2 — JAMA Network Open (2025). Rationale and Methodological Approach Underlying the Development of the SOFA-2 Score: A Consensus Statement. JAMA Network Open, 8(10), e2545040. DOI 10.1001/jamanetworkopen.2025.45040. The emerging successor to the SOFA score: six organ systems retained, with CNS renamed brain, hepatic renamed liver, and coagulation renamed hemostasis, plus added variables (delirium requiring medication; noninvasive ventilation, HFNC, and ECMO; summed catecholamine doses; other vasopressors and inotropes; mechanical support devices; renal replacement therapy). Presented on this page as an emerging development only. It is not verified whether SSC 2026 formally adopts SOFA-2 for the sepsis definition — SSC 2026 still references the Sepsis-3 ≥ 2-point threshold. Do not treat SOFA-2 as the current exam or clinical standard.
Centers for Disease Control and Prevention. Sepsis clinical guidance and data. Source of the population-level framing: sepsis is a leading cause of death, and early recognition and treatment improve survival.
N5301 Week 14–15 course materials — Shock States I & II lecture slides and directed reading. The course framing of shock states, including the emphasis on the genitourinary tract as the most common source of sepsis in the elderly and the use of the Hour-1 bundle as the course standard. Where the course and the current guidelines diverge: the course teaches the 2018 Hour-1 Bundle and the SSC 2016 7–10 day antimicrobial duration. SSC 2021 replaced the bundle with severity-stratified timing and dropped the numeric duration in favor of daily reassessment; SSC 2026 refined both further. This report teaches the course material for your exams and clinicals and labels the current guideline position so you know which is which at the bedside.
Open the sources yourself
Direct links, so you can read the guideline rather than take my word for it. Open access means the full text is free; opens in browser means the publisher blocks automated checks but the page loads normally for you.
Guidelines and primary sources for this topic
Shared reference pages
This is a study aid built from course readings and published guidelines, not a standing order set. Doses are the ones those sources print — but your patient's renal function, weight, allergies, pregnancy status, and your institution's antibiogram and formulary decide what is actually given. Confirm every drug against your facility's policy and a current reference, and escalate to your preceptor rather than extrapolating from a study page.