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Canadian Journal of Infectious Diseases and Medical Microbiology
Volume 23, Issue 4, Pages 204-208
http://dx.doi.org/10.1155/2012/198383
Original Article

Coagulase-Negative Staphylococcus, Catheter-Related, Bloodstream Infections and their Association with Acute Phase Markers of Inflammation in the Intensive Care Unit: An Observational Study

Oleksa Rewa,1 John Muscedere,1,2,3 Steve Reynolds,4,5 Xuran Jiang,3 and Daren K Heyland1,2,3

1Department of Medicine, Queen’s University, Canada
2Critical Care Program, Queen’s University, Canada
3Clinical Evaluation Research Unit, Kingston General Hospital, Kingston, Ontario, Canada
4Critical Care Program, University of British Columbia, Canada
5Department of Critical Care, Royal Columbian Hospital, Vancouver, British Columbia, Canada

Copyright © 2012 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

OBJECTIVE: To examine the relationship between the isolation of coagulase-negative Staphylococcus in blood cultures and acute phase markers of inflammation.

METHODS: The present study was a prospective observational analysis conducted at three medical/surgical intensive care units (ICUs) involving adult patients with an expected ICU stay of more than 24 h duration.

RESULTS: Of the 598 patients enrolled, 573 developed suspected bloodstream infection and 434 (72.6%) had blood cultures sent 24 h after ICU admission; 142 were excluded due to positive cultures from other sites. Of the remaining 292 patients, 31 (10.7%) grew coagulase-negative Staphylococcus, 59 (20.2%) grew known pathogenic organisms and 202 (69.2%) did not grow any organisms in their blood cultures. Twenty-five patients without suspicion of infection served as the control group. Interleukin (IL)-6, procalcitonin (PCT) and C-reactive protein (CRP) levels were highest among the known pathogen group (IL-6 271.8 U/L, PCT 4.6 U/L and CRP 164 mg/L), were similar between the coagulase-negative Staphylococcus and negative culture groups (IL-6 67.0 U/L versus 61.4 U/L [P=1.00]; PCT 1.0 U/L versus 0.9 U/L [P=0.80]; and CRP 110 mg/L versus 103 mg/L [P=0.75]), and were lowest in the control group (IL-6 31.0 U/L, PCT 0.2 U/L and CRP 41.0 mg/L). In the coagulase-negative Staphylococcus group, patients who died by day 28 had increased inflammatory bio-marker levels compared with survivors, although the differences were not statistically significant.

CONCLUSIONS: Coagulase-negative Staphylococcus isolated from blood cultures were associated with lower levels of inflammation compared with bloodstream infections due to known pathogens and were comparable with levels in patients with negative cultures.