A -year-old man with a history of advanced HIV (CD4 count of ) is brought to the emergency department by his partner due to days of fever, severe headache, and progressive confusion. His temperature is (), blood pressure is , and pulse is . Physical examination reveals nuchal rigidity and a positive Brudzinski sign. He is lethargic but withdraws all extremities to pain. Fundoscopic examination shows early papilledema. Suspecting acute bacterial meningitis, the physician decides on a management plan. Arrange the following steps in the most appropriate chronological order of execution for this patient.
- 1Obtain two sets of blood cultures.
- 2Administer empiric intravenous antimicrobial therapy and dexamethasone.
- 3Obtain a noncontrast computed tomography (CT) scan of the head.
- 4Perform a lumbar puncture for cerebrospinal fluid analysis.
Answer
The correct sequence is to first obtain blood cultures, immediately followed by the administration of empiric antimicrobial therapy and dexamethasone, then obtain a noncontrast head CT, and finally perform a lumbar puncture.
The correct sequence prioritizes rapid administration of antimicrobial therapy without compromising the diagnostic yield of blood cultures, while safely managing the risk of cerebral herniation. Blood cultures are drawn first. Because the patient has advanced HIV and papilledema, a CT scan is required before the lumbar puncture. However, antibiotics must never be delayed for imaging, so they are given immediately after blood cultures are drawn. Once therapy is initiated, the CT scan is performed, followed by the lumbar puncture if the CT confirms the absence of mass effect.
Step-by-Step Solution
Key Concept
Management sequence of suspected bacterial meningitis in patients with indications for cranial imaging prior to lumbar puncture.
Estimated Time:1m 30s