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Lumbar punctures and meningitis
Abstract:
Four patients, with an additional seven from the literature, had meningitis following a lumbar puncture (LP) that disclosed normal cerebrospinal fluid (CSF). Animal studies demonstrate that perforation of the meninges in the presence of bacteremia enhances the development of meningitis. Simultaneous blood culture should be obtained with all LPs. Regardless of the results of the initial LP, a second CSF examination is recommended in any patient whose clinical condition is deteriorating. If the initial blood culture is positive, a second LP should be strongly considered in all newborn and very young infants.
Insights
Meningitis can occur after lumbar puncture (LP) even with normal cerebrospinal fluid (CSF). Consider repeat CSF tests and blood cultures, especially in infants, if meningitis is suspected.
Area of Science:
- Neurology
- Infectious Diseases
- Pediatrics
Background:
- Meningitis following lumbar puncture (LP) is a rare but serious complication.
- Normal cerebrospinal fluid (CSF) findings on initial LP do not always rule out meningitis.
Purpose of the Study:
- To highlight the risk of meningitis after LP with normal CSF.
- To recommend diagnostic and management strategies for suspected post-LP meningitis.
Main Methods:
- Review of four patient cases with meningitis post-LP and normal CSF.
- Inclusion of seven additional cases from existing literature.
- Reference to animal studies on meningeal perforation and bacteremia.
Main Results:
- Meningitis occurred in patients despite initial normal CSF analysis after LP.
- Animal models show that meningeal perforation during bacteremia increases meningitis risk.
Conclusions:
- Obtain simultaneous blood cultures with all LPs.
- Repeat CSF examination is crucial for deteriorating patients, irrespective of initial LP results.
- Consider a second LP for newborns and young infants with positive blood cultures.