An evidence-based training module aligned with the Surviving Sepsis Campaign 2024-2025 guidelines. You will learn to recognize sepsis early, initiate the Hour-1 Bundle, manage hemodynamic resuscitation, and practice clinical decision-making through patient scenarios.
Sepsis is a life-threatening organ dysfunction caused by a dysregulated host response to infection. Understanding the current definitions and pathophysiology is essential for early recognition and intervention.
The Third International Consensus Definitions redefined sepsis as infection plus organ dysfunction, identified by an acute change of 2 or more points in the Sequential Organ Failure Assessment (SOFA) score. This replaced the older SIRS-based definition to improve specificity.
Infection with organ dysfunction: SOFA score increase of 2 or more points from baseline. Carries an in-hospital mortality of approximately 10% or greater.
A subset of sepsis with circulatory and cellular/metabolic dysfunction: requires vasopressors to maintain MAP of 65 mmHg or greater AND serum lactate greater than 2 mmol/L despite adequate fluid resuscitation. Mortality exceeds 40%.
The older SIRS criteria (temperature, heart rate, respiratory rate, white blood cell count) are sensitive but not specific for sepsis. Many hospitalized patients meet SIRS criteria without infection. The SOFA score assesses six organ systems (respiratory, coagulation, liver, cardiovascular, CNS, renal) and better predicts outcomes in sepsis.
| Framework | Components | Role |
|---|---|---|
| SIRS (Legacy) | Temp, HR, RR, WBC | Screening trigger, not diagnostic |
| SOFA | 6 organ systems scored 0-4 | Defines organ dysfunction in ICU |
| qSOFA | RR, SBP, mental status | Bedside screening outside ICU |
In sepsis, the immune system responds to infection with an uncontrolled cascade of pro-inflammatory and anti-inflammatory mediators. This leads to endothelial damage, microvascular thrombosis, tissue hypoperfusion, and progressive organ dysfunction. The response can be thought of as a continuum from localized infection through sepsis to septic shock and multi-organ failure.
Key concept: Sepsis is not simply an infection. It is the body's own dysregulated response that causes harm. Organ dysfunction is the defining feature, and early detection of that dysfunction saves lives.
Timely recognition of sepsis is the single most important factor in reducing mortality. Standardized screening tools help clinicians identify at-risk patients before clinical deterioration becomes irreversible.
The qSOFA score requires no laboratory tests and can be performed in under a minute at the bedside. A score of 2 or more should prompt urgent investigation for organ dysfunction.
| Criterion | Threshold | Points |
|---|---|---|
| Respiratory rate | 22 breaths/min or greater | 1 |
| Systolic blood pressure | 100 mmHg or less | 1 |
| Altered mental status | GCS less than 15 | 1 |
Tracks 7 physiological parameters (RR, SpO2, supplemental O2, temperature, SBP, HR, consciousness). Aggregate scores of 5+ or a score of 3 in any single parameter trigger clinical escalation.
Simplified scoring using HR, SBP, RR, temperature, and consciousness level. Widely used in resource-limited settings. A score of 4 or more warrants immediate physician assessment.
The SSC recommends that hospitals implement systematic sepsis screening for all patients presenting with possible infection, particularly in the emergency department and on general wards. Screening should combine vital sign monitoring with clinical suspicion and laboratory markers (lactate, WBC, procalcitonin).
Clinical pearl: Elderly and immunocompromised patients may not mount a fever or tachycardia. A high index of suspicion and reliance on screening tools is critical in these populations. Altered mental status may be the earliest and only sign of sepsis in older adults.
The Hour-1 Bundle is the cornerstone of early sepsis management. All elements should be initiated within the first hour of sepsis recognition. The clock starts at triage or at the moment of clinical suspicion, not at ICU admission.
Obtain serum lactate level immediately. If initial lactate is elevated (greater than 2 mmol/L), remeasure within 2-4 hours to guide resuscitation and assess tissue perfusion.
Obtain blood cultures (at least 2 sets, aerobic and anaerobic) BEFORE initiating antibiotics. Do not delay antibiotics if cultures cannot be obtained promptly.
Administer empiric broad-spectrum antibiotics as soon as possible, ideally within 1 hour of sepsis recognition. Each hour of delay in antibiotic administration is associated with increased mortality.
Administer 30 mL/kg of IV crystalloid for hypotension or lactate 4 mmol/L or greater. Begin rapidly. Reassess volume status and tissue perfusion frequently during and after fluid resuscitation.
If MAP remains below 65 mmHg during or after fluid resuscitation, start vasopressors (norepinephrine first-line). Do not wait until full fluid volume is completed to initiate vasopressors if hypotension is severe.
Time is critical: Every hour of delay in completing the sepsis bundle elements is associated with a measurable increase in mortality. The Hour-1 Bundle is not a suggestion; it is a standard of care. Initiate all elements simultaneously, not sequentially.
Identifying and controlling the source of infection is essential for definitive sepsis management. Antibiotics alone cannot resolve infections that require drainage, debridement, or device removal.
Pneumonia is the most common source of sepsis. Assess with chest X-ray, sputum cultures, and respiratory viral panels. Consider CT chest for complicated cases.
UTI and pyelonephritis, especially in elderly, catheterized, and diabetic patients. Obtain urinalysis and urine culture. Consider CT abdomen/pelvis for obstruction.
Cholecystitis, appendicitis, diverticulitis, bowel perforation, intra-abdominal abscess. CT with contrast is the imaging modality of choice. Surgical consultation is often required.
Cellulitis, wound infections, necrotizing fasciitis, infected pressure ulcers. Physical examination is key. CT or MRI for deep tissue involvement. Surgical debridement may be emergent.
Request urgent surgical consultation when the source of sepsis requires procedural intervention:
Key principle: Source control should be achieved within 6-12 hours of identification whenever feasible. Delaying source control in favor of stabilization alone can worsen outcomes. The most appropriate intervention should use the least physiologically disturbing approach effective for the situation.
Restoring adequate tissue perfusion is the primary goal of hemodynamic management in sepsis. This requires a systematic approach to fluid resuscitation, vasopressor therapy, and ongoing monitoring.
Not all septic patients respond to fluids. After the initial bolus, assess for fluid responsiveness before giving additional fluids to avoid volume overload.
| Agent | Role | Key Notes |
|---|---|---|
| Norepinephrine | First-line | Potent alpha-1 agonist; raises MAP effectively with less tachycardia than dopamine |
| Vasopressin | Second-line adjunct | Add at fixed dose (up to 0.03 U/min) to reduce norepinephrine requirements; not titrated |
| Epinephrine | Third-line | Consider if MAP target not achieved with norepinephrine plus vasopressin |
| Dobutamine | Inotrope (if needed) | Consider for sepsis-induced cardiomyopathy with evidence of low cardiac output despite adequate volume |
Maintain mean arterial pressure of 65 mmHg or greater. Higher targets (80 mmHg) may be considered in patients with chronic hypertension, but the SSC suggests 65 as the initial target.
Use trends in lactate clearance, urine output (target 0.5 mL/kg/hr or greater), capillary refill time, skin mottling, and mental status to assess adequacy of resuscitation rather than relying on any single number.
Clinical pearl: Peripheral vasopressor infusion through a well-functioning IV is safe for short-term use while awaiting central line placement. Do not delay vasopressor initiation for central access. Early vasopressor use alongside fluid resuscitation improves outcomes.
Rapid empiric antibiotics save lives in sepsis. However, stewardship principles remain essential: use the right drug, at the right dose, for the right duration, and de-escalate as soon as microbiological data allows.
| Source | Typical Coverage |
|---|---|
| Pulmonary (CAP) | Beta-lactam + macrolide, or respiratory fluoroquinolone |
| Pulmonary (HAP/VAP) | Anti-pseudomonal beta-lactam +/- vancomycin (if MRSA risk) |
| Urinary | Third-generation cephalosporin or fluoroquinolone; consider anti-pseudomonal if complicated |
| Abdominal | Broad-spectrum beta-lactam/beta-lactamase inhibitor or carbapenem + metronidazole |
| Skin/Soft tissue | Vancomycin + piperacillin-tazobactam; add clindamycin if necrotizing fasciitis suspected |
| Unknown source | Broad-spectrum: vancomycin + anti-pseudomonal beta-lactam (e.g., piperacillin-tazobactam or meropenem) |
Once culture results and susceptibilities are available (typically 48-72 hours), narrow antibiotic coverage to the most targeted effective agent. De-escalation reduces the emergence of resistant organisms, decreases adverse effects, and lowers cost without worsening outcomes.
The SSC suggests shorter courses of antibiotics for most sepsis patients where source control is adequate:
Stewardship principle: Start broad, narrow early. Empiric therapy must be aggressive to cover likely pathogens, but prolonged broad-spectrum use drives resistance and complications. Every antibiotic day matters.
Septic shock represents the most severe end of the sepsis continuum. When initial resuscitation fails to restore hemodynamic stability, a structured approach to escalation is critical.
The SSC suggests IV hydrocortisone (200 mg/day) for adults with septic shock who require escalating vasopressor support despite adequate fluid resuscitation. Corticosteroids may accelerate shock reversal, though their effect on overall mortality remains modest. Administer as a continuous infusion or divided doses (50 mg every 6 hours).
Serial lactate measurement is essential to assess the trajectory of resuscitation. The SSC recommends remeasuring lactate every 2-4 hours until values normalize. A target lactate clearance of 20% or greater within 2 hours is associated with improved survival. Persistent elevation or rising lactate indicates ongoing tissue hypoperfusion and warrants escalation of care.
In-hospital mortality approximately 10-20%. Prognosis improves substantially with early recognition and bundle compliance.
Mortality 40-60%. Factors associated with higher mortality include advanced age, multiple comorbidities, high SOFA score, elevated lactate, and delayed antibiotic administration.
In patients with refractory septic shock, high baseline frailty, or multiple organ failure, clinicians should initiate goals of care conversations early. This includes discussing prognosis honestly, exploring patient and family values, considering code status, and integrating palliative care when appropriate. These conversations should occur in parallel with active treatment, not only when treatment is failing.
Remember: Refractory septic shock has high mortality, but outcomes continue to improve with protocolized care, early source control, and systematic escalation. Even in the sickest patients, evidence-based management matters.
You have completed all 7 learning sections.
Apply your knowledge to four patient scenarios. Identify sepsis criteria, select appropriate bundle interventions, and receive real-time clinical feedback.
Maria is brought to the ED from her nursing home. Staff report she has been increasingly confused over the past 12 hours with decreased oral intake. She has a history of recurrent UTIs and Type 2 diabetes.
Vitals: Temp 38.9°C, HR 110, RR 24, BP 88/52, SpO2 94% on room air
Labs: WBC 18,200, Lactate 3.8 mmol/L, Creatinine 2.1 (baseline 1.0), Glucose 340 mg/dL
Exam: Confused, oriented only to self. Suprapubic tenderness. Foul-smelling urine in Foley bag. Skin warm and flushed.
James underwent an open cholecystectomy 3 days ago for gangrenous cholecystitis. He was progressing well until this morning when the nurse reports a new fever and increasing abdominal pain. He has a surgical drain in place with minimal output.
Vitals: Temp 39.2°C, HR 118, RR 20, BP 105/68, SpO2 96% on room air
Labs: WBC 22,100, Lactate 2.4 mmol/L, Platelets 98,000 (were 210,000 on POD1), Total bilirubin 3.2
Exam: Alert but appears unwell. Abdomen distended and tender in the right upper quadrant with guarding. Surgical drain output has changed from serous to bilious-appearing.
Linda presents to the ED with a 3-day history of worsening redness and swelling of her left lower leg. She has poorly controlled Type 2 diabetes (A1C 10.2%) and peripheral vascular disease. She initially treated the wound at home but now reports the pain has become excruciating and the skin is turning dusky with fluid-filled blisters.
Vitals: Temp 39.8°C, HR 132, RR 28, BP 72/40, SpO2 91% on room air
Labs: WBC 26,400, Lactate 6.2 mmol/L, Creatinine 2.8 (baseline 1.2), Glucose 420 mg/dL, CK 1,840, INR 1.8, Platelets 62,000
Exam: Toxic-appearing, diaphoretic. Left leg with tense edema, hemorrhagic bullae, crepitus on palpation, skin necrosis extending to mid-thigh. Pain disproportionate to appearance. Leg cool distally.
Ahmed, a previously healthy 30-year-old man, presented 6 hours ago with a 4-day history of cough, fever, and dyspnea. He was started on ceftriaxone and azithromycin with 3L IV crystalloid. Despite initial treatment, he is rapidly deteriorating. He is now intubated and mechanically ventilated.
Vitals (current): Temp 40.1°C, HR 140, BP 58/32 (on norepinephrine at 25 mcg/min), SpO2 88% on FiO2 100%, PEEP 14
Labs: WBC 2,100 (was 14,000 on admission), Lactate 8.4 mmol/L (was 4.2 on admission), pH 7.18, PaO2/FiO2 ratio 68, Creatinine 3.4, Platelets 38,000, Bilirubin 4.1
Status: Received 4L crystalloid total. Norepinephrine at 25 mcg/min. Vasopressin recently added at 0.03 U/min. MAP remains 52 mmHg. Urine output 10 mL over the last 2 hours.
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