Surgical Sepsis

Surgical Sepsis - Code Red Germs

• Key Pathogens & Significance:
  • Staphylococcus aureus (esp. MRSA): Leading cause of SSIs; toxin-mediated.
  • Streptococcus pyogenes (GAS): Rapidly progressive necrotizing infections.
  • Enterococci (esp. VRE): High-level antibiotic resistance.
  • Pseudomonas aeruginosa: Opportunistic, biofilm former, common in burns/ICU.
  • Escherichia coli & other Enterobacterales (ESBL/CRE): Gut translocation, MDR.
  • Bacteroides fragilis: Predominant anaerobe in intra-abdominal sepsis.
  • Clostridium spp. (C. perfringens, C. difficile): Gas gangrene, colitis.
  • Candida spp.: Fungal sepsis in high-risk patients.

⭐ Carbapenem-Resistant Enterobacterales (CRE) are a critical threat in surgical ICUs, associated with high mortality due to limited treatment options.

Surgical Sepsis - Red Alert Clues

• Clinical Signs (Suspect Sepsis):
  • Temperature > 38°C or < 36°C
  • Heart Rate > 90 bpm
  • Respiratory Rate > 20 breaths/min
  • Altered mental status
  • Systolic BP < 100 mmHg
  • Source of infection (e.g., surgical site, wound, catheter)
• Key Lab Markers:
  • WBC > 12,000/µL or < 4,000/µL, or >10% immature bands
  • ↑ C-reactive protein (CRP)
  • ↑ Procalcitonin (PCT > 0.5 ng/mL is significant)
  • ↑ Serum lactate > 2 mmol/L (indicates tissue hypoperfusion)
  • Hyperglycemia (Blood glucose > 140 mg/dL in non-diabetic patient)
  • Acute oliguria (Urine output < 0.5 mL/kg/hr for ≥ 2 hrs despite fluid resuscitation)
• Scoring (Risk Stratification & Diagnosis):
  • qSOFA (quick SOFA): For rapid bedside assessment. Score ≥ 2 suggests high risk of poor outcome.
    • Respiratory Rate ≥ 22/min
    • Altered mentation (GCS < 15)
    • Systolic BP ≤ 100 mmHg
  • SOFA (Sequential Organ Failure Assessment): Assesses degree of organ dysfunction. An acute increase of ≥ 2 SOFA points confirms sepsis.

⭐ Procalcitonin (PCT) is a more specific biomarker for bacterial sepsis compared to CRP and its levels correlate with severity of infection, guiding antibiotic stewardship.

Surgical Sepsis - The Rescue Mission

• Core Strategy: Rapidly implement Surviving Sepsis Campaign (SSC) Hour-1 Bundle. Time is tissue!
  • Lactate: Measure; remeasure if initial > 2 mmol/L.
  • Cultures: Obtain blood cultures before antibiotics.
  • Antibiotics: Administer broad-spectrum IV antibiotics (e.g., Piperacillin-Tazobactam + Vancomycin depending on suspected source/local resistance) within 1 hour.
  • Fluids: Rapid 30 mL/kg crystalloid for hypotension or lactate ≥ 4 mmol/L.
  • Pressors: Vasopressors (Norepinephrine 1st line) if MAP < 65 mmHg post-fluids to ensure organ perfusion.
• Source Control: THE cornerstone in surgical sepsis. 📌 "Drain the Pus, Cut the Dead, Remove the Bad!"
  • Urgently identify & control infection: drainage of abscess, debridement of necrotic tissue, removal of infected hardware/catheters.
  • Target: definitive control within 6-12 hours of diagnosis.
• Monitoring & Support: Continuous hemodynamic monitoring (e.g., Arterial line), qSOFA/SOFA scores, glucose control, DVT prophylaxis.

⭐ Early and adequate source control is often the most critical intervention in surgical sepsis, significantly impacting outcomes.

Surgical Sepsis - Damage & Defense

• Damage: Systemic Inflammatory Response Syndrome (SIRS) progresses to sepsis, septic shock, & Multiple Organ Dysfunction Syndrome (MODS).
  • Key mediators: TNF-α, IL-1, IL-6.
  • Endothelial damage, microvascular thrombosis, cellular dysoxia.
  • Organ dysfunction: Lungs (ARDS), kidneys (AKI), liver, CNS.
• Defense: Host immune response aims to eradicate infection & restore homeostasis.
  • Crucial: Early recognition, source control (drainage, debridement), appropriate antibiotics, hemodynamic support.
  • Preventive measures: Asepsis, timely intervention.

⭐ MODS is the most common cause of late death in sepsis patients, often initiated by gut-origin sepsis and translocation of bacteria/endotoxins across a compromised gut barrier (gut-lymph hypothesis).

High‑Yield Points - ⚡ Biggest Takeaways

• Sepsis: Life-threatening organ dysfunction (SOFA score ↑ by ≥2) from dysregulated infection response.
• qSOFA (Altered Mentation, SBP ≤100 mmHg, RR ≥22/min) for rapid sepsis suspicion.
• Septic Shock: Sepsis needing vasopressors for MAP ≥65 mmHg & lactate >2 mmol/L despite fluids.
• Hour-1 Bundle: Lactate, cultures, broad-spectrum antibiotics, rapid fluids, vasopressors. Critical for survival.
• Early source control (drainage, debridement) is paramount in surgical sepsis.