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ORIGINAL ARTICLE a Comparison of Neonatal Gram-Negative Rod and Gram-Positive Cocci Meningitis

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ORIGINAL ARTICLE a Comparison of Neonatal Gram-Negative Rod and Gram-Positive Cocci Meningitis Journal of Perinatology (2006) 26, 111–114 r 2006 Nature Publishing Group All rights reserved. 0743-8346/06 $30 www.nature.com/jp ORIGINAL ARTICLE A comparison of neonatal Gram-negative rod and Gram-positive cocci meningitis PB Smith1,2, CM Cotten1, HP Garges1, KF Tiffany1, RW Lenfestey1, MA Moody1,JSLi1,2 and DK Benjamin Jr1,2 1Department of Pediatrics, Duke University, Durham, NC, USA and 2Duke University Clinical Research Institute, Durham, NC, USA intrapartum antibiotics to prevent disease from group B Objective: Neonatal meningitis is an illness with potentially devastating streptococci (GBS) has been shown to select for more resistant consequences. Early identification of potential risk factors for Gram-negative Gram-negative rod (GNR) organisms.3,4 The importance of GNRs rod (GNR) infections versus Gram-positive cocci (GPC) infection prior to as a pathogen in the neonatal period, therefore, may be obtaining final culture results is of value in order to appropriately guide increasing.3,5–7 expirical therapy. We sought to compare laboratory and clinical parameters Practitioners often rely on cerebrospinal fluid (CSF) parameters of GNR and GPC meningitis in a cohort of term and premature infants. rather than CSF culture to define meningitis because of the use Study Design: We evaluated lumbar punctures from neonates cared for of intrapartum antibiotics and the practice of delaying lumbar at 150 neonatal intensive care units managed by the Pediatrix Medical puncture (LP) until after blood culture results are available. Group Inc. We compared cerebrospinal fluid (CSF) parameters (white Moreover, CSF cultures may be negative in the face of true 8–11 blood cell count, red blood cell count, glucose, and protein), meningitis. Although normal values for CSF parameters in demographics, and outcomes between infants with GNR and GPC healthy full-term infants and for full-term infants with meningitis 1,12,13 meningitis. CSF cultures positive with coagulase-negative staphylococci have been described, the differentiation between Gram- were excluded. negative and Gram-positive infections based on cell-count, glucose, and protein levels in the CSF is less well defined. Most studies Results: We identified 77 infants with GNR and 86 with GPC meningitis. describing CSF findings in GNR meningitis are from single centers There were no differences in gestational age, birth weight, infant sex, and often include older children and adults.12,14–16 The purpose of race, or rate of Caesarean section. GNR meningitis was more often this report was to compare CSF parameters observed in culture- diagnosed after the third postnatal day and was associated with higher proven neonatal meningitis, based on the assumption that if CSF white blood cell and red blood cell counts. GNR meningitis diagnosed in parameters are identified that distinguish GNR from Gram-positive the first 3 days of life was associated with antepartum antibiotic exposure. cocci (GPC) meningitis, practitioners could make better initial No difference was noted in either CSF protein or glucose levels. After antimicrobial therapy choices. correcting for gestational age, there was no observed difference in mortality between infants infected with GNR or GPC. Conclusion: Compared to GPC meningitis, GNR meningitis was associated with several aspects of the clinical history and laboratory Methods findings including older age of presentation, antepartum exposure to A cohort of neonates discharged from 150 neonatal intensive care antibiotics, and elevated CSF white blood cell and red blood cell counts. units (NICUs) managed by the Pediatrix Medical Group Inc. from Journal of Perinatology (2006) 26, 111–114. doi:10.1038/sj.jp.7211438 1997 to 2004 that had a LP performed was evaluated. The data were obtained from an administrative database with collection Keywords: cerebrospinal fluid; mortality; antibiotics method described previously.10,17 LP data from neonates with CSF reservoirs and shunts were excluded from the study. Meningitis was diagnosed by either a positive CSF culture or a positive antigen test Introduction from the CSF with a corresponding positive blood culture with the The incidence of bacterial meningitis is higher in the first month same organism. CSF was processed at each site according to the of life than at any other period.1,2 The widespread use of individual hospital’s laboratory standards. Positive CSF cultures for coagulase-negative staphylococci were excluded. Only the first Correspondence: Dr DK Benjamin Jr, PO Box 17969, Duke Clinical Research Institute, positive CSF culture from each patient was used in the analysis. Durham, NC 27705, USA. E-mail: [email protected] The Duke University Institutional Review Board provided Received 8 September 2005; revised 31 October 2005; accepted 12 November 2005 permission to conduct this analysis. A comparison of neonatal GNR and GPC meningitis PB Smith et al 112 Outcomes We compared CSF parameters (white blood cell (WBC) and red blood cell (RBC) counts, glucose, protein) and demographic data from infants with meningitis caused by GNR and GPC. For the analyses, mortality was defined as death of infant prior to discharge. P-values were calculated using nonparametric testing, either Wilcoxon rank sum or Fisher’s exact test; except when logistic regression was used. CSF parameter values were described by their medians rather than their means as each CSF parameter dataset contained several extreme outliers. Analysis was conducted using SAS 8.02, (SAS Institute, Cary, NC, USA). All reported P-values are two-tailed. Figure 1 Cell count (per mm3). Results Table 1 Demographics of the cohort We evaluated CSF results from 14 017 lumbar punctures; 86 infants GNR (n ¼ 77) GPC (n ¼ 86) P-value were infected with GPC and 77 with GNR. The demographics of the cohort are outlined in Table 1: 38% of the infants were very-low- Gestational age 0.28 birth-weight (<1500 g) and 56% were born preterm. There were no 25% tile 28 27 significant differences between the two groups in birth weight, Median 33 37 gestational age, gender, race, or mode of delivery. Infants 75% tile 38 39 undergoing LP after the third day of life LP were more likely to be infected with GNR organisms. Birth weight (g) 0.18 Of the 60 neonates diagnosed with meningitis in the first 3 days 25% tile 1075 917 Median 1718 2808 of life, 69% (11/16) of those exposed to antepartum antibiotics were 75% tile 2805 3457 infected with GNRs while only 30% (13/44) of those with no previous antibiotic exposure were infected with GNRs. After Sex 0.75 controlling for preterm delivery (as a dichotomous variable) using Male 39 (51%) 46 (53%) logistic regression analysis, GNR infection in the first 3 days of life Female 38 (49%) 40 (47%) was associated with previous antepartum antibiotic administration (OR ¼ 4.6 (1.2, 16.8), P ¼ 0.023). Preterm delivery itself was Day of life tapped 0.039 associated with a higher risk of GNR infection in the first 3 days 0–3 days 24 (40%) 46 (59%) of life with an OR of 3.3 (1.04, 10.6). >3 days 36 (60%) 32 (41%) There were significant differences between WBC and RBC counts between infants infected with GNR and GPC (Figure 1). The Amiotic fluid 0.76 median WBC count was 1217/mm3 (25th%, 75th%: 43, 3263) for Meconium 6 (9%) 6 (8%) No meconium 50 (91%) 66 (92%) neonates with GNR meningitis and 187 (38, 980) for neonates with GPC meningitis (P ¼ 0.043). The median RBC count was Delivery method 0.59 3 465/mm (100, 3275) and 160 (18, 1145) for GNR and GPC, Vaginal 33 (58%) 47 (63%) respectively (P ¼ 0.024). No difference was observed in CSF glucose C-section 24 (42%) 28 (37%) levels; 22 mg/dl (9, 52) for GNR infections and 36 (3, 55) for GPC infections (P ¼ 0.89) or in CSF protein levels; 296 mg/dl (171, Race 0.31 588) and 279 (146, 550) for neonates with GNR and GPC, White 44 (57%) 46 (53%) respectively (P ¼ 0.79). Median WBC counts for individual species Black 9 (12%) 12 (14%) are given in Table 2. Hispanic 17(22%) 23 (27%) The mortality associated with selected species of GNRs and GPC Other 7 (9%) 5 (6%) are shown in Figure 2. The mortality of GNR meningitis was 13% (8/64) compared with 4% (3/75) in GPC meningitis. Using logistic regression to control for gestational age, the mortality observed in eight infants with nonenteric GNR infections died, including the the GNR cohort was not statistically different than the mortality five infected with Pseudomonas aeruginosa. The mortality rate observed in the GPC cohort, OR ¼ 2.7 (0.6, 11.3). None of the was 16% (4/25) in neonates with Escherichia coli. Journal of Perinatology A comparison of neonatal GNR and GPC meningitis PB Smith et al 113 In this study, we found significantly higher WBC and RBC counts in the infants with GNR meningitis. One explanation for the increased RBC count observed in the GNR cohort might be from higher rates of traumatic LPs in this lower birth weight cohort. Although the previously observed differences in CSF glucose and protein levels were not observed, this study was compatible with the previous observations that CSF parameters in GNR infections are more likely to be abnormal.1,12 Higher CSF WBC and RBC counts in the proper context should increase the clinician’s suspicion for GNR meningitis. Neonatal GNR meningitis has been associated with increased mortality (30–41%) when compared with GPC meningitis (15%).2,11,16 The mortality rate for GNR meningitis in our sample, Figure 2 Mortality by organism. 13%, is lower than most previously published findings. One reason for this finding may be our inclusion of all neonates with meningitis regardless of birth weight.
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