spectrum comparison
Sepsis Progression: SIRS → Sepsis → Severe Sepsis → Septic Shock — The Escalation Timeline
Calling everything "sepsis" costs time and lives. Each stage along this spectrum triggers specific, escalating interventions — and the NCLEX will test whether you know which stage demands fluids alone versus vasopressors. Misclassifying the stage means choosing the wrong priority action.
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Quick reference
Comparison
Progression3 stages
Progression — 3 stages
SIRS (Screen)
What's happening- Systemic inflammation — a SCREEN, not sepsis
- qSOFA is a bedside alternative
Key findings- ★≥2: temp >38/<36, HR >90, RR >20, WBC >12k/<4k
- Plus known/suspected infection
- BP often normal
Nursing focus- Screen with SIRS/qSOFA
- find infection source
- Trend vitals
- cultures if infection suspected
Lactate trend- Usually < 2 mmol/L
Sepsis
What's happening- ★Infection + new organ dysfunction
- "Severe sepsis" is a retired legacy term
Key findings- ↑ lactate, AMS, ↓ urine output
- ↓ platelets, ↑ bilirubin
- hypotension fluid-responsive
Nursing focus- ★Cultures BEFORE antibiotics
- abx within 1 hr
- 30 mL/kg crystalloid
- trend lactate
- source control
Lactate trend- ≥ 2 signals hypoperfusion
- recheck q2–4h
Septic Shock
What's happening- Vasopressor-dependent hypotension
- high mortality
Key findings- ★Vasopressors needed for MAP ≥ 65
- Lactate > 2 despite fluids
- multi-organ failure
Nursing focus- Norepinephrine first-line for MAP ≥ 65
- Central + arterial line
- hydrocortisone if refractory
Lactate trend- > 2 after fluids
- often > 4 (tissue hypoxia)
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Clinical Pearl
Still hypotensive after 30 mL/kg fluids? That's septic shock — start vasopressors, not more fluid.
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