Fever with 90 systolic
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fever hypotension sepsis septic shock diagnosis criteria management
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systolic BP 90 fever differential diagnosis workup
GradeResponse
GradeResponse
Fever + Systolic BP ~90 mmHg
This combination is a red flag presentation — assume sepsis/septic shock until proven otherwise and act urgently.
Immediate Recognition
Sepsis-3 Criteria (Harrison's, p. 8257):
- Sepsis = suspected infection + acute organ dysfunction (SOFA score ↑ ≥2 from baseline)
- Septic shock = sepsis + vasopressor requirement to maintain MAP ≥65 mmHg + serum lactate >2.0 mmol/L despite adequate fluid resuscitation
A systolic of 90 with fever strongly suggests sepsis-related hypoperfusion.
Differential Diagnosis
| Condition | Key Features |
|---|---|
| Septic shock | Most common; fever, tachycardia, warm/flushed skin early, source of infection |
| Severe pneumonia | Pleuritic chest pain, cough, hypoxia |
| Meningitis/meningoencephalitis | Neck stiffness, photophobia, altered mental status |
| Infective endocarditis | New murmur, embolic phenomena, IV drug use |
| Severe malaria (endemic areas) | Travel history, no meningism despite coma |
| Toxic shock syndrome | Rash, recent tampon use/wound infection |
| Adrenal crisis (+ infection) | Steroid history, hyponatremia, hyperkalemia |
| Dengue/viral hemorrhagic fever | Travel, thrombocytopenia, rash |
Urgent Workup
Labs (simultaneous):
- Blood cultures × 2 (before antibiotics if possible — do not delay antibiotics)
- CBC, CMP, lactate, coagulation panel (PT/INR, fibrinogen)
- Procalcitonin, CRP
- Blood smear if malaria endemic area / travel history
- Urinalysis + urine culture
Imaging:
- CXR (pneumonia, effusion)
- Consider CT chest/abdomen/pelvis if source unclear
Bedside:
- qSOFA: RR ≥22, altered mentation, SBP ≤100 — score ≥2 → high suspicion for sepsis
Management — "Hour-1 Bundle" (Surviving Sepsis Campaign)
- Measure lactate — re-measure if initial >2 mmol/L
- Blood cultures before antibiotics
- Broad-spectrum IV antibiotics within 1 hour of recognition
- IV crystalloid 30 mL/kg for hypotension or lactate ≥4 mmol/L
- Vasopressors (norepinephrine first-line) if hypotension persists after fluids to target MAP ≥65 mmHg
If the source remains unclear after initial workup, empirical broad-spectrum antibiotics (e.g., piperacillin-tazobactam or meropenem ± vancomycin) should be started immediately — do not wait for culture results.
Disposition
- ICU or step-down — this patient needs continuous hemodynamic monitoring
- Identify and control the source (drain abscess, remove infected device, etc.)
SBP 90 + fever = act fast. The window to prevent organ failure is narrow.
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