Which adjunctive therapy should be given with empiric meningitis treatment prior to culture results?

• A. Interferon gamma
• B. Epinephrine
• C. Prednisone
• D. Dexamethasone

Answer: (D)

The main concept here is using an adjunctive corticosteroid to blunt the inflammatory damage in bacterial meningitis while you’re awaiting culture results. Dexamethasone is the best choice for this purpose because it has strong CSF penetration and has repeatedly shown to improve neurologic outcomes, particularly reducing hearing loss and other sequelae in pneumococcal meningitis and Hib meningitis in children.

In practice, dexamethasone should be given just before or with the first dose of empiric antibiotics. The idea is to dampen the inflammatory response that bacteria release when they’re lysed by antibiotics, which can otherwise cause significant CNS injury.

Other options don’t fit this purpose. Interferon gamma isn’t used to treat meningitis. Epinephrine is unrelated to meningitis management. Prednisone is a corticosteroid, but the specific evidence supporting dexamethasone over prednisone for meningitis, and its better CNS penetration and proven benefit, makes dexamethasone the preferred adjunct in the empiric treatment setting.