Article Text

other Versions

PDF
Risk factors for late onset gram-negative infections: a case–control study
  1. Srabani Samanta1,
  2. Kate Farrer2,
  3. Aodhan Breathnach3,
  4. Paul T Heath4,5
  1. 1Neonatal Unit, St Mary's Hospital, Manchester, UK
  2. 2Neonatal Unit, Rosie Hospital, Addenbrooke's NHS Trust, Cambridge, UK
  3. 3Department of Medical Microbiology, St George's Hospital, London, UK
  4. 4Child Health, St George's, University of London, London, UK
  5. 5St George's Vaccine Institute, St George's, University of London, London, UK
  1. Correspondence to Dr Paul T Heath, Division of Child Health, St George's, University of London, Cranmer Terrace, Tooting, London SW17 0RE, UK; pheath{at}sgul.ac.uk

Abstract

Objectives To determine the incidence, mortality and risk factors for neonatal late onset gram-negative sepsis and meningitis (LOGNS).

Design Retrospective case–control study.

Setting Tertiary neonatal unit in London.

Patients Consecutive inborn infants with late onset (>48 h of life) invasive gram-negative infections diagnosed between 1999 and 2005. Controls were healthy infants matched for gestation and time of admission to the neonatal unit.

Main outcome measures Clinical and risk factor data.

Results 73 cases of LOGNS were identified of which 48 were inborn and included in the study (incidence 1.85/1000 live births). Enterobacter spp. (28%), Escherichia coli (27%) and Klebsiella spp. (21%) were the most common pathogens. The majority of infants were of very low birthweight (VLBW; 79%), and cases and controls were well matched (median gestation 26 weeks). Overall case death was 27% in cases versus 13.5% in controls (p=0.08). There was no significant difference between cases and controls regarding maternal risk factors. Mechanical ventilation, total parenteral nutrition (TPN) and its duration, presence of a central venous line and its duration, use of specific antibiotics and the occurrence of necrotising enterocolitis at or before the first positive culture were all significantly associated with case status in univariate analysis. In multivariate logistic regression analysis, only duration of TPN at or before first positive blood culture remained independently associated with LOGNS (p<0.001).

Conclusions LOGNS occurs predominantly in VLBW infants. When the influence of gestational age is accounted for, the only independent risk factor found for late onset gram-negative neonatal infections is the duration of TPN.

Statistics from Altmetric.com

Footnotes

  • Competing interests None.

  • Provenance and peer review Not commissioned; externally peer reviewed.

Request permissions

If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.