Step 3 CCS: Sepsis

Sepsis CCS cases demand immediate, protocolized action within the first simulated hour. You must execute the Surviving Sepsis Campaign bundles: lactate measurement, blood cultures, broad-spectrum antibiotics, and aggressive fluid resuscitation — all before identifying the source. Delayed antibiotics or insufficient volume resuscitation are the primary ways examinees fail these cases.

Clinical Approach — What Attendings Do First

The First Minute

  • Blood cultures x2 from separate peripheral sites — BEFORE antibiotics, but do not delay antibiotics if cultures take time
  • Lactate level, CBC, BMP, hepatic function panel, PT/INR, urinalysis
  • Broad-spectrum antibiotics immediately: vancomycin 25-30 mg/kg IV + piperacillin-tazobactam 4.5g IV
  • Normal saline 30 mL/kg IV bolus (typically 2-3 L for 70 kg patient)
  • Continuous telemetry, arterial line if ICU-bound, Foley catheter for urine output

Key Orders

  • Norepinephrine drip starting at 0.1 mcg/kg/min if MAP <65 after fluids (central line preferred)
  • Repeat lactate at 2-4 hours (if initial lactate >2, target >10% clearance)
  • Source identification: chest X-ray, urinalysis + culture, CT abdomen if intra-abdominal source suspected
  • Procalcitonin (guides antibiotic duration — trend down to guide de-escalation)
  • Vasopressin 0.04 units/min if norepinephrine requirements escalating
  • Hydrocortisone 50 mg IV q6h if vasopressor-dependent septic shock (stress-dose steroids)
  • DVT prophylaxis, stress ulcer prophylaxis (IV pantoprazole if intubated)

Time-Sensitive Actions

  • Antibiotics within 1 hour — each hour of delay increases mortality by approximately 7-8%
  • 30 mL/kg crystalloid within first 3 hours — do not under-resuscitate
  • Vasopressors if MAP <65 despite fluids — do not continue fluids indefinitely hoping for improvement
  • Re-measure lactate at 2-4 hours: failure to clear >10% predicts worse outcomes and should prompt escalation

Common CCS Pitfalls

  • Delaying antibiotics to wait for culture results — give empiric coverage immediately
  • Under-resuscitating — 30 mL/kg sounds like a lot, but septic patients have massive third-spacing
  • Continuing only fluids when MAP stays <65 — start norepinephrine early, do not fluid-overload the patient
  • Forgetting source control — antibiotics alone won't cure an undrained abscess or obstructed ureter
  • Not de-escalating antibiotics when cultures return — narrow to targeted therapy within 48-72 hours

Frequently Asked Questions

What is the Hour-1 sepsis bundle I need to execute on CCS?

Within 1 simulated hour: (1) Measure lactate. (2) Obtain blood cultures x2 from separate sites. (3) Administer broad-spectrum antibiotics (e.g., vancomycin + piperacillin-tazobactam or meropenem). (4) Begin 30 mL/kg crystalloid for hypotension or lactate ≥4 mmol/L. (5) Start vasopressors (norepinephrine) if MAP remains <65 mmHg after initial fluid resuscitation. Order all five simultaneously on CCS.

How do I choose empiric antibiotics for sepsis on CCS?

Community-acquired sepsis without specific source: vancomycin 25-30 mg/kg IV + piperacillin-tazobactam 4.5g IV q6h. If penicillin allergy: vancomycin + meropenem 1g IV q8h (or aztreonam for anaphylactic PCN allergy). Suspected intra-abdominal: pip-tazo or meropenem covers anaerobes. Suspected UTI: pip-tazo or ceftriaxone + gentamicin. Always add MRSA coverage (vancomycin) until cultures return.

When should I add vasopressors in a CCS sepsis case?

Start norepinephrine (first-line vasopressor) when MAP <65 mmHg despite 30 mL/kg crystalloid resuscitation — do not give unlimited fluids before starting pressors. Target MAP ≥65. If norepinephrine alone is insufficient (>0.25 mcg/kg/min), add vasopressin 0.04 units/min. If still refractory, consider IV hydrocortisone 200 mg/day (stress-dose steroids for septic shock).

Related Organ System Topics

Infectious Disease

Infectious disease is one of the broadest and highest-yield areas on USMLE Step 3.

Emergency Medicine

Emergency medicine on USMLE Step 3 covers the initial evaluation and stabilization of critically ill and injured patients.

Pulmonology

Pulmonary medicine on USMLE Step 3 includes obstructive and restrictive lung diseases, acute respiratory failure, pulmonary embolism, and pneumonia management.

Practice Sepsis CCS Cases

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