Sepsis-induced organ dysfunction management

Hemodynamic Support - Shock & Awe Resuscitation

• Initial Fluid Resuscitation:
  • Rapid infusion of 30 mL/kg isotonic crystalloid within the first 3 hours. Reassess fluid responsiveness dynamically.
• Vasopressor Therapy (if hypotensive during/after fluids):
  • Target Mean Arterial Pressure (MAP): ≥65 mmHg.
  • First-line: Norepinephrine (potent α-1, modest β-1 agonist).
  • Second-line: Add Vasopressin (V1 agonist) to decrease norepinephrine needs, or Epinephrine.
  • 📌 "No-Va-E": Norepinephrine → Vasopressin → Epinephrine.
• Inotropic Support:
  • Add Dobutamine for persistent hypoperfusion or signs of myocardial dysfunction (e.g., ↑ cardiac filling pressures, ↓ cardiac output) despite adequate volume and MAP.

⭐ The arterial catheter for continuous blood pressure monitoring should be placed as soon as practical in patients requiring vasopressors. This provides more accurate MAP readings than cuff measurements.

Respiratory Failure - Lungs Under Pressure

• ARDS: Sepsis-induced hypoxemia ($PaO₂/FiO₂ \le 300$) with bilateral infiltrates on CXR. A major cause of mortality.

• Core Strategy: Lung-Protective Ventilation (LPV)

  • Low Tidal Volume (LTV): 6 mL/kg (predicted body weight).
  • Plateau Pressure (Pplat): Keep < 30 cm H₂O.
  • PEEP: Use to recruit alveoli and improve oxygenation.
  • Permissive Hypercapnia: Tolerate ↑PaCO₂ to minimize ventilator-induced lung injury (VILI).

• Adjunctive Therapies:

  • Prone Positioning: For moderate-to-severe ARDS ($PaO₂/FiO₂ < 150$).
  • Conservative Fluids: After initial resuscitation, diurese to a neutral/negative balance.

⭐ Low tidal volume ventilation is the cornerstone of ARDS management and is proven to decrease mortality.

Renal & Metabolic - Kidney & Sugar Crisis

• Acute Kidney Injury (AKI):

  • Monitor urine output (goal > 0.5 mL/kg/hr) & creatinine.
  • Ensure adequate fluid resuscitation to maintain renal perfusion.
  • Consider Renal Replacement Therapy (RRT) for anuria, severe metabolic acidosis, or refractory hyperkalemia.

• Glycemic Control:

  • Target blood glucose 140-180 mg/dL using an insulin infusion.
  • Monitor frequently to prevent iatrogenic hypoglycemia.

⭐ In septic patients, tight glycemic control (<110 mg/dL) is associated with increased mortality due to hypoglycemia risk.

Systemic Support - Collateral Damage Control

• Lung Protective Ventilation (ARDS): Low tidal volume ($4-6$ mL/kg ideal body weight), plateau pressure <30 cm H₂O. Use PEEP.
• Glycemic Control: Target glucose <180 mg/dL with insulin infusion. Avoid hypoglycemia.
• VTE Prophylaxis: LMWH/unfractionated heparin. Use mechanical if bleeding risk is high.
• Stress Ulcer Prophylaxis: PPI/H2 blockers for major bleeding risk factors (coagulopathy, mechanical ventilation >48h).
• Nutrition: Early enteral feeding is preferred.
• Corticosteroids: Consider IV hydrocortisone for refractory shock unresponsive to fluids/vasopressors.

⭐ In septic ARDS, low tidal volume ventilation is the only intervention proven to reduce mortality.

High‑Yield Points - ⚡ Biggest Takeaways

• Aggressive fluid resuscitation is the initial cornerstone, but judicious use is key to prevent volume overload.
• Norepinephrine is the first-line vasopressor to maintain a Mean Arterial Pressure (MAP) ≥65 mmHg.
• Add vasopressin or epinephrine as second-line agents for persistent hypotension despite adequate fluids and norepinephrine.
• Consider IV hydrocortisone for patients in refractory septic shock.
• Provide organ support: mechanical ventilation for ARDS and renal replacement therapy for acute kidney injury.