Surviving Sepsis Campaign: 1-Hour Bundle, Vasopressors & Resuscitation

**1. Sepsis-3 Consensus Definitions** * **Sepsis**: Life-threatening organ dysfunction caused by a dysregulated host response to infection. Clinically defined by an acute increase of **$\ge$ 2 points on the Sequential Organ Failure Assessment (SOFA) score**. * **Septic Shock**: A subset of sepsis where underlying circulatory and cellular/metabolic abnormalities are profound enough to substantially increase mortality. Clinically identified by: 1. Persistent hypotension requiring vasopressors to maintain a **Mean Arterial Pressure (MAP) $\ge$ 65 mmHg**, AND 2. Serum lactate level **> 2.0 mmol/L (18 mg/dL)** despite adequate volume resuscitation. *(Hospital mortality exceeds 40%)*. * **qSOFA (Quick SOFA - Bedside Screening)**: 1 point each for: - Respiratory rate $\ge$ 22 breaths/min. - Altered mental status (Glasgow Coma Scale <15). - Systolic blood pressure $\le$ 100 mmHg. *(Score $\ge$ 2 indicates high risk of in-hospital deterioration).* **2. The Surviving Sepsis Campaign: 1-Hour Bundle (Initiate Immediately)** 1. **Measure Serum Lactate**: Remeasure within 2–4 hours if initial lactate is elevated (>2 mmol/L) to guide resuscitation. 2. **Blood Cultures Prior to Antibiotics**: Obtain at least 2 sets of blood cultures (aerobic and anaerobic) without causing substantial delay (<45 min). 3. **Empirical Broad-Spectrum Antimicrobials**: Administer within **1 hour of sepsis recognition**. Use optimal beta-lactam dosing strategies (prolonged/continuous infusion). 4. **Rapid Fluid Resuscitation**: Administer **30 mL/kg of intravenous balanced crystalloids** (e.g., Plasmalyte or Ringer's Lactate) within the first 3 hours for hypotension or lactate $\ge$ 4 mmol/L. *Avoid synthetic starches and normal saline (risk of hyperchloremic metabolic acidosis).* 5. **Vasopressors**: Initiate if patient is hypotensive during or after fluid resuscitation to maintain MAP $\ge$ 65 mmHg. **3. Stepwise Vasopressor & Inotrope Protocol** * **First-Line Vasopressor: Noradrenaline (Norepinephrine)**: - Potent $\alpha_1$-adrenergic vasoconstriction with mild $\beta_1$ inotropy. Increases SVR and MAP with minimal tachycardia. - Starting dose: 0.02–0.05 $\mu$g/kg/min; titrate rapidly to MAP $\ge$ 65 mmHg. Can be infused peripherally via a large-bore IV line safely for a short duration while awaiting central venous access. * **Second-Line Adjunct: Vasopressin (AVP)**: - Added at a fixed non-titratable dose of **0.03 units/min** when noradrenaline dose reaches 0.25–0.5 $\mu$g/kg/min, reducing noradrenaline requirements and counteracting relative vasopressin deficiency. * **Third-Line Vasopressor: Adrenaline (Epinephrine)**: - Added if MAP remains inadequate despite noradrenaline and vasopressin. * **Inotropic Therapy: Dobutamine**: - Indicated in patients with persistent hypoperfusion despite adequate volume and MAP, or with documented myocardial dysfunction (elevated filling pressures, low cardiac index). Dose: 2.5–20 $\mu$g/kg/min. **4. Advanced Hemodynamic Monitoring & Corticosteroids** * **Dynamic over Static Measures**: Use dynamic measures of fluid responsiveness (passive leg raise test coupled with real-time cardiac output, stroke volume variation [SVV], or pulse pressure variation [PPV]) over static CVP measurements to guide further fluid administration. * **Intravenous Corticosteroids**: - Indicated only in **refractory septic shock** where ongoing vasopressor requirements remain high (noradrenaline $\ge$ 0.25 $\mu$g/kg/min for $\ge$ 4 hours). - Regimen: **IV Hydrocortisone 200 mg/day** (administered as 50 mg IV q6h or as a continuous infusion). Taper when vasopressors are discontinued. **5. 📖 Standard Textbook Reference** * *Harrison's Principles of Internal Medicine*, 21st Ed., Ch. 297: Sepsis and Septic Shock, pp. 2245–2256. * *Surviving Sepsis Campaign: International Guidelines for Management of Sepsis and Septic Shock 2021/2024*, Intensive Care Med, 47(11):1181–1247.