Background: The aim of the present study was to evaluate the characteristics and accuracy of cerebrospinal fluid (CSF) parameters for neonatal meningitis, by comparing CSF data in newborns and in infants ≤ 2 months of age, with or without meningitis.
Methods: This case-control study was performed on 120 newborns and infants ≤ 2 months old. 60 patients with meningitis were considered as the case group and 60 ill patients without meningitis were defined as the control group. Each of the two groups was divided into 0-1 months and 1-2 months old. CSF characteristics were compared in newborns in the case and control groups; in infants ≤ 2 months old in the case and control groups; and in healthy newborns and healthy infants ≤ 2 months old.
Results: The mortality rate was 16.7% in the case group. The differences of CSF parameters in the case and control groups were mostly not significant, except for CSF glucose only in term newborns <7 days old (P= 0.04), and white cell count (WBC) only in 0-7-day-old term and preterm neonates (P= 0.04 and P= 0.01, respectively). Polymorphonuclear leukocyte (PMNL) level in the case group was significantly higher than in the control group (P= 0.02). CSF characteristics in healthy newborns were nearly the same as in healthy infants ≤ 2 months old. Prevalence of positive CSF culture was 31.7% in the case group. The most common pathogen was Neisseria meningitidis in the two age groups. The concomitant positive blood culture in the case group was 26.3%.
Conclusion: In the case of meningitis with negative CSF culture and Gram stain, diagnosis can be made on CSF parameters, clinical and laboratory findings and suspicion of meningitis. Therefore, a clinical prediction rule to classify risk for bacterial meningitis on evaluation of CSF parameters in any region should be established. More regional trials are needed to enhance the probability of diagnosis according to CSF parameters.
© 2011 The Authors. Pediatrics International © 2011 Japan Pediatric Society.