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Lumbar punctures in suspected bacterial meningitis: too many or too few?
1Department of Casualty, Royal Alexandria Hospital for Children, Camperdown, New South Wales, Australia.
Insights
Immediate lumbar puncture (LP) in children with suspected meningitis is safe and effective. Delayed or omitted LP in pediatric meningitis cases may hinder diagnosis but rarely impacts patient outcomes.
Area of Science:
- Pediatrics
- Neurology
- Infectious Diseases
Background:
- Meningitis diagnosis in children often requires lumbar puncture (LP).
- The risks associated with LP versus the risks of delaying or omitting the procedure are not well-defined in pediatric populations.
Purpose of the Study:
- To prospectively evaluate the frequency of delayed or omitted lumbar puncture in children with suspected meningitis.
- To assess the safety and diagnostic yield of immediate LP compared to delayed or no LP.
- To determine the clinical outcomes associated with different LP timings in pediatric meningitis.
Main Methods:
- Prospective study of children aged 1 month to 14 years admitted with suspected meningitis.
- Data collection on timing of lumbar puncture, diagnostic findings, and adverse events.
- Analysis of outcomes in relation to whether LP was performed immediately, delayed, or not performed.
Main Results:
- Of 218 children with suspected meningitis, 89.4% had immediate LP; 11 had traumatic taps.
- Meningitis was diagnosed in 49 children (18 bacterial, 31 viral) following immediate LP, with no cerebral herniation.
- Six children did not undergo LP; four had presumptive bacterial meningitis, impacting diagnosis and outcomes.
Conclusions:
- Immediate lumbar puncture in children with suspected meningitis is associated with minimal adverse effects and is diagnostically valuable.
- Delayed or omitted LP may compromise the identification of causative organisms and diagnosis in some pediatric meningitis cases.
- While delayed LP did not adversely affect outcomes in this cohort, immediate LP is recommended for timely diagnosis and management of pediatric meningitis.
Abstract:
Children aged 1 month to 14 years admitted to the Royal Alexandria Hospital for Children during a 10 month period with suspected meningitis were studied prospectively. The aims were to determine how often lumbar puncture (LP) was delayed or never done, in relation to the outcome of all children, in order to determine the risks of LP and the risks of not doing LP. Of 218 children with suspected meningitis, LP was performed immediately in 195 (89.4%). Meningitis was diagnosed in 49 of these (bacterial 18, viral 31). No child developed cerebral herniation due to immediate LP. There were 11 traumatic taps and two children required repeated attempts. Lumbar puncture was delayed, but performed at a later time in 17 children, of whom three had proven bacterial meningitis, 1 had presumed bacterial meningitis but no organism was detected and 13 had alternative diagnoses. Six children never had an LP, although ventricular cerebrospinal fluid was obtained from two. Four of these six children had presumptive bacterial meningitis, one had tuberculous meningitis presenting with acute hydrocephalus and diagnosed post-mortem, and one had a very poor neurological outcome and no final diagnosis was reached. Of the 27 children with bacterial meningitis, LP was performed immediately in 18, or two-thirds. There were only minor adverse effects of immediate LP. Delayed LP probably resulted in failure to identify the organism in one child with bacterial meningitis, but did not adversely affect outcome in any child. Of the six children in whom LP was never performed, in only one was no final diagnosis reached.(ABSTRACT TRUNCATED AT 250 WORDS)