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Draw lactate + blood cultures x2; initiate broad-spectrum antibiotics within 60 min
30 mL/kg balanced crystalloids (Lactated Ringer's) within first 3 hours for shock/lactate >= 4
Norepinephrine 0.05–0.5 mcg/kg/min (target MAP >= 65 mmHg)
Vasopressin 0.03 units/min fixed dose (add when Norepinephrine reaches 0.25 mcg/kg/min)
Hydrocortisone 200 mg/day (50 mg IV q6h) for refractory septic shock on dual vasopressors
Bottom-Line Clinical Pearl
Sepsis is medical emergency where mortality increases by 7.6% for every hour antibiotic administration is delayed in septic shock. Execute the Surviving Sepsis 1-Hour Bundle: lactate, blood cultures x2, broad-spectrum IV antibiotics, and 30 mL/kg balanced crystalloid. Septic shock is diagnosed by persistent hypotension requiring vasopressors to maintain MAP >= 65 mmHg AND serum lactate > 2.0 mmol/L despite fluid resuscitation. Start peripheral Norepinephrine early—do not delay vasopressor initiation while awaiting a central line.
The international Sepsis-3 consensus defines Sepsis as life-threatening organ dysfunction caused by a dysregulated host response to infection. Organ dysfunction is clinically identified by an acute increase in the Sequential Organ Failure Assessment (SOFA) score >= 2 points (associated with hospital mortality > 10%). Septic Shock is a subset of sepsis characterized by profound circulatory, cellular, and metabolic abnormalities, carrying mortality rates exceeding 40%.
| Condition | Diagnostic Definition | Diagnostic Thresholds | Associated Mortality |
|---|---|---|---|
| Sepsis | Infection + Acute Organ Dysfunction | Acute increase in total SOFA score >= 2 points from baseline | 10–20% |
| Septic Shock | Sepsis + Vasopressor Requirement + Hyperlactatemia | Persistent hypotension requiring vasopressors to maintain MAP >= 65 mmHg AND serum lactate > 2.0 mmol/L (18 mg/dL) despite adequate 30 mL/kg fluid resuscitation | > 40% |
| qSOFA (Bedside Screen) | Non-ICU screening tool for patients at high risk of deterioration | Score >= 2 of 3 criteria: 1) Respiratory rate >= 22/min; 2) Altered mentation (GCS < 15); 3) Systolic BP <= 100 mmHg | Flags high-risk patients outside the ICU |
The Surviving Sepsis Campaign guidelines mandate initiation of all elements of the 1-Hour Bundle immediately upon presentation with suspected sepsis or septic shock:
| Bundle Element | Timeframe | Action & Technical Protocol | Clinical Pitfall |
|---|---|---|---|
| 1. Serum Lactate | Within 60 min | Measure venous or arterial lactate; remeasure within 2–4 hours if initial > 2.0 mmol/L | Failing to check repeat lactate to assess resuscitation clearance |
| 2. Blood Cultures | Prior to antibiotics | Obtain at least 2 sets of blood cultures (aerobic and anaerobic) from separate venipuncture sites | Do NOT delay antibiotic administration beyond 60 minutes if cultures cannot be rapidly obtained |
| 3. Broad-Spectrum IV Antibiotics | Within 60 min | Administer empiric broad-spectrum coverage tailored to suspected source and local resistance | Every 1-hour delay in septic shock increases mortality by 7.6% (Kumar et al.) |
| 4. Rapid Fluid Resuscitation | Within 1–3 hours | Administer 30 mL/kg of balanced crystalloid (Lactated Ringer's) for hypotension or lactate >= 4.0 mmol/L | Blind fluid administration beyond 30 mL/kg in non-responsive, edematous patients |
| 5. Vasopressor Initiation | Immediate/early | Apply vasopressors during or immediately after fluid resuscitation to maintain MAP >= 65 mmHg | Delaying vasopressor initiation until all 30 mL/kg fluid has completely infused |
Empiric antimicrobial selection must cover both Gram-positive (including MRSA) and Gram-negative pathogens (including Pseudomonas aeruginosa) when the source is unknown, adjusting for local antibiograms:
| Suspected Focus | First-Line Empiric Antimicrobial Regimen | Weight-Based Dosing & Route | Special Populations/Alternative Regimens |
|---|---|---|---|
| Unknown Focus/Severe Sepsis | Vancomycin + Cefepime (or Piperacillin-Tazobactam) | Vancomycin 15–20 mg/kg IV (max 2g) + Cefepime 2g IV q8h (or Zosyn 4.5g IV q6h) | If severe beta-lactam anaphylaxis: Vancomycin + Aztreonam 2g IV + Levofloxacin 750 mg IV. |
| Intra-Abdominal Sepsis | Ceftriaxone + Metronidazole OR Meropenem | Ceftriaxone 2g IV daily + Metronidazole 500 mg IV q8h; Meropenem 1g IV q8h for severe shock | Add Vancomycin if patient has prior MRSA history or recent surgical instrumentation. |
| Pulmonary (Severe Sepsis CAP) | Ceftriaxone + Azithromycin + Vancomycin | Ceftriaxone 2g IV daily + Azithromycin 500 mg IV daily + Vancomycin 15–20 mg/kg IV | If hospital-acquired/Pseudomonas risk: Cefepime 2g IV + Tobramycin 7 mg/kg IV + Vancomycin. |
| Urosepsis (Complicated UTI) | Ceftriaxone OR Cefepime | Ceftriaxone 1–2g IV q24h; Cefepime 2g IV q8h (if indwelling catheter or nosocomial) | If obstructive pyelonephritis (ureteral stone): Emergent urology consult for stent/nephrostomy. |
| Neutropenic Fever (ANC < 500) | Cefepime OR Meropenem monotherapy | Cefepime 2g IV q8h OR Meropenem 1g IV q8h | Add Vancomycin if hemodynamic instability, mucositis, or catheter-site erythema present. |
| Necrotizing Soft Tissue (NSTI) | Vancomycin + Piperacillin-Tazobactam + Clindamycin | Vancomycin 15–20 mg/kg + Zosyn 4.5g IV + Clindamycin 900 mg IV q8h | Clindamycin inhibits bacterial protein synthesis and halts toxic shock alpha-toxin production. |
When septic shock proves refractory to primary vasopressor therapy with Norepinephrine, follow a structured escalation ladder to preserve perfusion without inducing catastrophic ischemic vasoconstriction:
- Add Vasopressin (0.03 units/min fixed infusion): Vasopressin levels are depleted in prolonged septic shock. Adding fixed-dose vasopressin when norepinephrine exceeds 0.25 mcg/kg/min reduces norepinephrine requirements, preserves glomerular filtration, and stabilizes MAP.
- Add Epinephrine (0.05–0.5 mcg/kg/min): When MAP remains < 65 mmHg despite norepinephrine and vasopressin, add epinephrine for additional inotropic and vasopressor support.
- Initiate Stress-Dose Corticosteroids: Hydrocortisone 200 mg/day (administered as 50 mg IV q6h or 200 mg continuous infusion) is indicated for septic shock requiring escalating doses of vasopressors for > 4 hours. The APROCCHSS trial demonstrated that corticosteroids significantly reduce 90-day mortality in refractory septic shock.
- Inotropic Support with Dobutamine: If the patient exhibits persistent hypoperfusion (elevated lactate, ScvO2 < 70%) despite adequate volume and MAP, bedside POCUS revealing myocardial dysfunction warrants adding Dobutamine (2.5–20 mcg/kg/min) to Norepinephrine.
Practice Recommendation
Safe Peripheral Vasopressor Administration: Multiple prospective studies have proven that Norepinephrine can be safely infused via a dedicated 18G or 20G peripheral IV catheter placed at or proximal to the antecubital fossa for up to 24–48 hours. If extravasation occurs, immediately infiltrate Phentolamine (5–10 mg diluted in 10 mL saline) locally to prevent ischemic necrosis.
Test Your Sepsis & Septic Shock Clinical Acumen
Directly launch an active-recall practice block from our validated question bank with comprehensive explanations and distractor analyses.
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