A 3-year-old child with bacterial meningitis develops papilledema, bulging fontanelle, and herniation signs. Lumbar puncture was deferred. CT head is done first. In which scenario should dexamethasone be given and when is the timing critical?
- A Given only after CSF culture confirms bacterial meningitis
- B Given 15–30 minutes BEFORE or with the first dose of antibiotics — reduces hearing loss and neurological sequelae by attenuating cytokine-mediated inflammation at antibiotic lysis ✓
- C Given after completion of full antibiotic course for CNS inflammation
- D Never indicated in children under 5 years due to adrenal suppression risk
Explanation
Dexamethasone reduces the inflammatory cascade triggered by bacterial cell lysis at antibiotic administration. For maximum benefit, it must be given 15–30 minutes before or simultaneously with the first antibiotic dose — administering it after antibiotic initiation is far less effective. The main benefit demonstrated (particularly with H. influenzae type b meningitis) is reduction in sensorineural hearing loss. Benefit in pneumococcal meningitis in children from developing countries is less clear but dexamethasone is still used. It is not withheld in young children as a routine policy.
Reference: Ghai Essential Pediatrics, 10th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.