The MOST important determinant of outcome in bacterial meningitis that justifies not delaying antibiotics while awaiting CT head is:

• A Time to lumbar puncture
• B Time to first dose of dexamethasone
• C Time to blood culture collection
• D Time to first dose of antibiotics ✓

Explanation

Delay in antibiotic administration is the single most important modifiable determinant of mortality and neurological morbidity in bacterial meningitis. Current guidelines (Infectious Diseases Society of America and UK meningitis guidelines) mandate blood cultures and empirical IV antibiotics (ceftriaxone ± vancomycin) BEFORE CT if there are no features of raised ICP. LP can be deferred up to 4 hours after antibiotics without significantly affecting culture yield. Dexamethasone, while beneficial (especially in pneumococcal meningitis), is secondary to antibiotics.

Reference: Harrison's Principles of Internal Medicine, 21st ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.