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Difficulty: MediumInfectious Diseases

A 58-year-old man is brought to the emergency department by his wife due to fever, severe headache, and confusion that started 12 hours ago. His wife reports that he has also been dragging his right leg since the onset of symptoms. His temperature is 39.2°C (102.6°F), blood pressure is 145/90 mm Hg, and pulse is 110/min. Physical examination reveals marked nuchal rigidity and right-sided hemiparesis. He is lethargic but arouses to verbal stimuli. Arrange the following management steps in the most appropriate chronological order.

  1. 1Obtain blood cultures
  2. 2Administer intravenous dexamethasone and empiric antibiotics
  3. 3Perform a non-contrast CT scan of the head
  4. 4Perform a lumbar puncture

Answer

The correct chronological sequence is: obtain blood cultures, administer intravenous dexamethasone and empiric antibiotics, perform a non-contrast CT scan of the head, and perform a lumbar puncture.
In a patient with suspected bacterial meningitis and focal neurologic deficits (hemiparesis), a CT scan of the head is required before a lumbar puncture to avoid brain herniation. Because these procedures take time, life-saving therapy cannot be delayed. Therefore, blood cultures must be drawn immediately, followed promptly by empiric antibiotics and dexamethasone. Once therapy is initiated, the CT scan is performed, and if it is safe, the lumbar puncture is conducted.

Step-by-Step Solution

1
Identify indications for neuroimaging prior to lumbar puncture.
The patient's right-sided hemiparesis is identified as a focal neurologic deficit.
Focal deficits, altered mental status, papilledema, new-onset seizures, or an immunocompromised state require a CT scan before a lumbar puncture to rule out mass effect and prevent brain herniation.
2
Determine the first step in managing suspected bacteremia or meningitis.
Blood cultures must be drawn immediately.
Drawing blood cultures before antibiotic administration ensures the best chance of isolating the pathogen, and this step does not significantly delay life-saving therapy.
3
Determine the timing of empiric antimicrobial therapy.
Intravenous dexamethasone and empiric antibiotics are administered next.
When a CT scan is required, therapy cannot be delayed until after the imaging and lumbar puncture are completed. Dexamethasone must be given with or just before the antibiotics.
4
Sequence the remaining diagnostic procedures.
Perform the CT scan of the head, followed by the lumbar puncture.
The CT scan must confirm safety before the lumbar puncture is performed to obtain cerebrospinal fluid for definitive diagnosis.

Key Concept

Management sequence for suspected bacterial meningitis with indications for a head CT before lumbar puncture.
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Topics

Infectious Diseases

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