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The aseptic meningitis syndrome
S Nelsen1, D P Sealy, E F Schneider
1Self Memorial Hospital, Greenwood, South Carolina.
Abstract:
The diagnosis and treatment of acute meningitis is a challenge for the primary care physician. Differentiating between bacterial meningitis and aseptic meningitis is not always straightforward. The aseptic meningitis syndrome is usually viral in origin, and enteroviruses account for most cases. The aseptic syndrome also may be caused by unusual bacterial organisms such as Mycobacterium tuberculosis, Leptospira species, Brucella species, Borrelia burgdorferi and others. The classic presentation consists of the acute onset of meningismus, headache, fever, malaise with pleocytosis and normal glucose and slightly elevated protein in the cerebrospinal fluid. Cerebrospinal fluid lactate and serum C-reactive protein measurements may be helpful in differentiating aseptic meningitis from treatable bacterial meningitis. Aseptic meningitis of viral origin usually responds to expectant care. Other causes of aseptic meningitis must be searched for and treated if present.
Insights
Differentiating aseptic meningitis from bacterial meningitis can be difficult for primary care physicians. Identifying the cause is crucial for appropriate treatment, as viral meningitis often requires only supportive care, while bacterial meningitis needs prompt antibiotic intervention.
Area of Science:
- Neurology
- Infectious Diseases
- Primary Care Medicine
Background:
- Acute meningitis presents a diagnostic challenge for primary care physicians.
- Distinguishing between bacterial and aseptic meningitis is often complex.
- Aseptic meningitis is commonly viral (enteroviruses), but can stem from atypical bacteria (e.g., Mycobacterium tuberculosis, Leptospira, Brucella, Borrelia).
Purpose of the Study:
- To highlight the diagnostic challenges in differentiating bacterial from aseptic meningitis in primary care.
- To discuss the differential diagnosis of aseptic meningitis.
- To emphasize the importance of identifying the specific cause for appropriate management.
Main Methods:
- Review of classic clinical presentation of meningitis (meningismus, headache, fever, malaise).
- Analysis of cerebrospinal fluid (CSF) findings (pleocytosis, normal glucose, elevated protein).
- Evaluation of diagnostic markers: CSF lactate and serum C-reactive protein (CRP) for differentiating meningitis types.
Main Results:
- Classic meningitis symptoms include acute onset of headache, fever, and meningismus.
- CSF typically shows pleocytosis with normal glucose and slightly elevated protein in aseptic meningitis.
- CSF lactate and serum CRP levels may aid in distinguishing aseptic from bacterial meningitis.
Conclusions:
- Aseptic meningitis of viral origin generally responds to symptomatic treatment.
- Non-viral causes of aseptic meningitis require specific etiological investigation and targeted therapy.
- Accurate diagnosis is essential for guiding treatment strategies in acute meningitis cases.