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Difficulty: EasyInfectious Diseases

An emergency department physician is evaluating a college student brought in by roommates for a severe headache, high fever, and altered mental status. On physical examination, the patient is lethargic, has pronounced nuchal rigidity, and exhibits a new right-sided hemiparesis. Acute bacterial meningitis is highly suspected. Arrange the following interventions in the most appropriate sequential order for the immediate management of this patient.

  1. 1Obtain blood cultures
  2. 2Administer empiric antibiotics and dexamethasone
  3. 3Perform a computed tomography (CT) scan of the head
  4. 4Perform a lumbar puncture

Answer

The correct sequence is to first obtain blood cultures, immediately administer empiric antibiotics and dexamethasone, then perform a CT scan of the head, and finally perform a lumbar puncture.
The standard of care for suspected acute bacterial meningitis requires immediate empiric antibiotics. However, blood cultures should ideally be drawn right before antibiotic administration to maximize diagnostic yield for targeted therapy later. Because this patient has a focal neurologic deficit (hemiparesis), a lumbar puncture cannot be safely performed immediately due to the risk of brain herniation. Therefore, the patient must undergo a CT scan of the head prior to the lumbar puncture. Importantly, antibiotics must not be delayed while awaiting this CT scan.

Step-by-Step Solution

1
Obtain blood cultures
Blood samples are secured for microbiological analysis.
Securing cultures prior to antimicrobial exposure is critical to ensure pathogen viability, which allows for later de-escalation of therapy.
2
Administer empiric antibiotics and dexamethasone
Broad-spectrum antimicrobial and anti-inflammatory therapy is initiated rapidly.
Immediate treatment drastically reduces mortality in bacterial meningitis and must never be delayed while waiting for imaging or lumbar puncture.
3
Perform a computed tomography (CT) scan of the head
Neuroimaging is obtained to evaluate the brain structures.
Because the patient has a focal neurologic deficit (hemiparesis), there is a risk of a mass lesion or localized increased intracranial pressure. Imaging ensures it is safe to proceed with a lumbar puncture.
4
Perform a lumbar puncture
Cerebrospinal fluid is collected for analysis and culture.
Once neuroimaging rules out the risk of cerebral herniation, the procedure can be safely performed to definitively diagnose the infection.

Key Concept

Management Sequence for Bacterial Meningitis with Focal Neurologic Deficits
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Topics

Infectious Diseases

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