C‐reactive protein and immature‐to‐total neutrophil ratio have no utility in guiding lumbar puncture in suspected neonatal sepsis. (30th March 2018)

• Record Type: Journal Article
• Authors: Goldfinch, Christopher D; Korman, Tony; Kotsanas, Despina; Burgner, David P; Tan, Kenneth
• Is Part Of: Journal of paediatrics and child health. Volume 54:Number 8(2018:Aug.)
• Page Start: 848
• Page End: 854
• Publication Date: 2018-03-30
• Subjects: C‐reactive protein -- immature‐to‐total neutrophil ratio -- inflammatory markers -- lumbar puncture -- meningitis; Children -- Health and hygiene -- Periodicals; Pediatrics -- Periodicals; 618.92
• DOI: 10.1111/jpc.13890
• Languages: English
• ISSNs: 1034-4810

Abstract

Abstract : Aim: Meningitis may complicate neonatal sepsis, but there is scant evidence to inform the decision to perform a lumbar puncture (LP) and considerable variation in practice. We investigated whether inflammatory markers − C‐reactive protein (CRP) and immature‐to‐total neutrophil ratio (ITR) – were predictive of meningitis or significant cerebrospinal fluid (CSF) pleocytosis and useful in guiding the decision to perform a LP. Methods: We studied all inpatients in a single tertiary neonatal unit who were <6 months of age who had a LP performed between March 2011 and October 2014. We categorised CSF results as follows: (i) culture‐positive meningitis; (ii) probable culture‐negative meningitis but meeting a priori criteria for significant CSF leucocytosis; or (iii) no evidence of meningitis. CRP and ITR obtained within 48 h of LP were analysed. We assessed the test performance of CRP and ITR by area under receiver operating characteristic curves. Results: A total of 757 (male 471, 62.2%) infants were included. The median (interquartile range) gestational age was 38.4 weeks (30–40.3), and birthweight was 2940 g (1330–3560). Ten (1.3%) infants had culture‐positive meningitis; 71 (9.4%) were classified as probable culture‐negative meningitis and 676 (89.3%) as non‐meningitis. The area under receiver operating characteristic curve for culture‐positive and probable culture‐negative meningitis was 0.43 for CRP (95% confidence interval 0.36–0.51) and 0.58 for ITR (0.51–0.65). At a CRP threshold of 30 mg/L, there was a positive likelihood ratio (LR) of 0.77 and a negative LR of 1.44. Conclusions: CRP and ITR perform poorly in identifying infants with confirmed or probable meningitis. The decision to perform an LP should be more focused on clinical grounds and/or a positive blood culture and less on inflammatory or haematological markers in isolation.