A febrile infant with a bulging fontanelle
A 7-month-old infant is brought to the emergency department with 2 days of fever, poor feeding, and irritability. Birth and developmental history are normal; immunizations are up to date for age. Temperature is 39.2°C, heart rate 176/min, respiratory rate 46/min, blood pressure 82/50 mmHg, capillary refill 3 seconds. The infant is drowsy but rousable, with a bulging anterior fontanelle and neck stiffness. A petechial rash is noted on the trunk. Parents report no recent travel and no sick contacts. Weight is 7.8 kg.
1. What is your immediate differential and first-line management in the first 30 minutes?
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Differential (in order of urgency):
- Bacterial meningitis (pneumococcus, meningococcus, Haemophilus influenzae type b if incomplete coverage).
- Meningococcal sepsis with petechial rash.
- Other invasive bacterial infection (occult bacteremia, urinary tract infection).
- Viral meningitis or encephalitis.
First 30 minutes:
- Resuscitation: Assess airway, breathing, circulation. Obtain IV/IO access; give a 20 mL/kg crystalloid bolus for shock (capillary refill 3 s, tachycardia, hypotension for age) and reassess.
- Antibiotics without delay: After blood cultures if this does not delay treatment, give IV ceftriaxone (or cefotaxime) plus vancomycin per local protocol; add ampicillin if Listeria coverage is indicated by age/local guidance. Do not delay antibiotics for lumbar puncture.
- Lumbar puncture: Perform if the infant is stable and there are no contraindications (e.g., shock, raised intracranial pressure signs, coagulopathy). If deferred, start treatment first.
- Supportive: Oxygen if hypoxic, monitor glucose, correct hypoglycemia, and involve senior pediatric and intensive care teams.
Key principle: In suspected bacterial meningitis with shock, antibiotics and resuscitation take priority over lumbar puncture.
2. The infant's condition worsens: he becomes less responsive and the petechial rash spreads rapidly. How would you escalate care?
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Recognition: Rapidly spreading petechiae with deteriorating consciousness suggests meningococcal septic shock with possible raised intracranial pressure.
Escalation:
- Airway and breathing: Call for senior/anesthesia support; be prepared for intubation if consciousness deteriorates or airway protection is needed. Avoid hyperventilation; maintain normal oxygenation and ventilation.
- Circulation: Continue fluid boluses cautiously (e.g., 10-20 mL/kg aliquots) with frequent reassessment; start vasoactive support (e.g., adrenaline or noradrenaline infusion) if shock persists after 40-60 mL/kg. Consider central access.
- Antibiotics: Ensure the first dose has been given; do not delay. Notify public health as meningococcal disease is notifiable and contact prophylaxis may be needed.
- Raised intracranial pressure: Position head up 15-30°, avoid neck compression, keep normocapnia, and discuss with pediatric intensive care; do not perform lumbar puncture if there are signs of raised pressure.
- Transfer: Arrange urgent transfer to a pediatric intensive care unit with retrieval team support.
- Communication: Inform parents clearly and compassionately about the seriousness, the need for intensive care, and the possibility of transfer; document discussions and consent.