Published online July 1, 2005
PEDIATRICS Vol. 116 No. 2 August 2005, pp. e241-e246 (doi:10.1542/peds.2004-2537)
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ELECTRONIC ARTICLE

Distinctive Distribution of Pathogens Associated With Peritonitis in Neonates With Focal Intestinal Perforation Compared With Necrotizing Enterocolitis

Eric W. Coates, MD*, M. Gary Karlowicz, MD{ddagger}, Daniel P. Croitoru, MD§ and E. Stephen Buescher, MD{ddagger}

* Department of Pediatrics, Wake Forest University School of Medicine, Winston-Salem, North Carolina
{ddagger} Departments of Pediatrics
§ Surgery, Eastern Virginia Medical School, Norfolk, Virginia

Objective. Candida and coagulase-negative staphylococci are emerging pathogens associated with focal intestinal perforation (FIP) and necrotizing enterocolitis (NEC) in neonates. The objective of this study was to determine whether there are significant differences in the predominant pathogens in culture-positive cases of peritonitis associated with FIP compared with NEC in neonates.

Methods. A retrospective cross-sectional study was conducted of neonates with peritoneal culture-positive peritonitis associated with FIP or NEC over a 12-year study period (1989–2000). Cases with peritonitis were identified from a microbiology database. NEC was defined by radiologic evidence of pneumatosis intestinalis or portal venous gas or by pathology reports or surgical operative notes describing large areas of transmural bowel necrosis. FIP was defined as a <1-cm intestinal perforation surrounded by otherwise normal tissue in the absence of NEC.

Results. Thirty-six cases of FIP were compared with 80 cases of NEC. Birth weight and gestational age were significantly lower in infants with FIP compared with NEC. Age at intestinal perforation and case fatality rates were similar between FIP and NEC. There were striking differences in the distribution of predominant pathogens associated with peritonitis in NEC and FIP cases. Enterobacteriaceae were present in 60 (75%) of 80 NEC cases compared with 9 (25%) of 36 FIP cases. In contrast, Candida species were found in 16 (44%) of 36 FIP cases compared with 12 (15%) of 80 NEC cases, and coagulase-negative staphylococci were present in 18 (50%) of 36 FIP cases versus 11 (14%) of 80 NEC cases. There were no significant differences between FIP and NEC cases for the presence of Enterococcus species (28% vs 23%) or anaerobes (3% vs 6%). Stratified analysis for birth weight <1200 g found similar significant differences in the predominant pathogens for FIP (n = 29) and NEC (n = 38). Results from peritoneal fluid cultures resulted in changes in antimicrobial therapy in 46 (40%) of 116 cases.

Conclusions. Candida species and coagulase-negative staphylococci were the predominant pathogens in FIP peritonitis in contrast to Enterobacteriaceae in NEC peritonitis. A peritoneal fluid culture should be obtained in all neonates with intestinal perforation, regardless of cause, because it may help to direct the choice of the most effective antimicrobial.

Key Words: infant • necrotizing enterocolitis • focal intestinal perforation • peritonitis • microbiology

Abbreviations: FIP, focal intestinal perforation • NEC, necrotizing enterocolitis • CONS, coagulase-negative staphylococcal

Accepted Feb 9, 2005.


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