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Meningitis in the neurosurgical patient
B A Kaufman1, A R Tunkel, J C Pryor
1Department of Neurosurgery, Washington University School of Medicine, St. Louis, Missouri.
Abstract:
In the patient with a basilar skull fracture and CSF leak, the risk of meningitis is greatly increased. The diagnosis of both leak and infection can be obscured by the patient's other injuries, and requires aggressive investigation of symptoms that suggest infection. Although the diagnosis is made with CSF cultures, when clinically suspected, treatment should begin after appropriate cultures have been obtained. Treatment should be directed against the most likely organisms, Streptococcus pneumoniae, Haemophilus influenzae, and the other organisms common to the upper respiratory tract. There are no good indications for prophylactic antibiotic usage in patients with known CSF leaks. The patient with a shunt or other CNS prosthetic device may have various manifestations of infection, depending on the type of device and its termination. Frank meningitis or ventriculitis is not always present. Diagnosis requires direct culturing of the shunt milieu, with the most frequent isolates being staphylococcal species and gram-negative enteric bacilli. The most effective therapy, for both eradication of the infection and minimization of the duration and morbidity of therapy, involves removal of the infected shunt, external drainage during parenteral antibiotic therapy, and complete replacement of hardware at the time of internalization. The postsurgical patient will not develop meningitis very frequently, but like the posttrauma patient, concurrent factors can make the diagnosis difficult. Differentiating infectious from chemical meningitis must often be initially based on CSF cell counts and chemistries alone. Treatment to cover the most likely organism, staphylococcal species and respiratory flora, should be started before the culture results are finalized.(ABSTRACT TRUNCATED AT 250 WORDS)
Insights
Patients with skull fractures and CSF leaks face increased meningitis risk. Prompt diagnosis and targeted antibiotics are crucial, but prophylactic antibiotics are not recommended.
Area of Science:
- Neuroscience
- Infectious Diseases
- Neurosurgery
Background:
- Basilar skull fractures and cerebrospinal fluid (CSF) leaks significantly elevate meningitis risk.
- Diagnosing infection in trauma patients is challenging due to concurrent injuries.
- Prosthetic devices like shunts can lead to varied infection presentations, not always frank meningitis.
Purpose of the Study:
- To outline diagnostic and treatment strategies for meningitis in patients with CSF leaks and CNS prosthetic devices.
- To emphasize timely diagnosis and appropriate antimicrobial therapy.
- To clarify the role of prophylactic antibiotics.
Main Methods:
- Clinical suspicion and aggressive investigation of infection symptoms.
- Cerebrospinal fluid (CSF) cultures for definitive diagnosis.
- Empirical antibiotic treatment targeting common pathogens (e.g., Streptococcus pneumoniae, Haemophilus influenzae, staphylococcal species, gram-negative enteric bacilli).
- For shunt infections: culturing the shunt environment, shunt removal, external drainage, and delayed replacement.
Main Results:
- CSF cultures confirm meningitis.
- Early antibiotic treatment is vital when infection is suspected, even before culture results.
- Prophylactic antibiotics are not indicated for known CSF leaks.
- Shunt infections require hardware removal and external drainage for effective treatment.
- Differentiating infectious from chemical meningitis relies initially on CSF analysis.
Conclusions:
- Prompt diagnosis and targeted treatment are essential for meningitis in patients with CSF leaks and CNS devices.
- Aggressive investigation and appropriate antibiotic selection are key.
- Management of shunt infections necessitates a multi-step approach including hardware removal and replacement.