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- Open Access
Longitudinal Neutrophil Cd64 Expression As a Biomarker For Acute Infection and Severity of Disease in Critically Ill Patients
© de Jong et al.; 2015
- Published: 1 October 2015
- Septic Shock
- Severe Sepsis
- CD64 Expression
- Granulocyte Colony Stimulate Factor
- Prospective Observational Study
Cluster of Differentiation 64 (CD64) antigen is a membrane glycoprotein expressed on monocytes and macrophages. It is the high affinity neutrophil FcγRI receptor which is weakly expressed by neutrophils at physiological levels, but strongly upregulated within 4-6 hours by the pleiotropic cytokines such as Interferon-γ (IFN-γ) and Granulocyte Colony Stimulating Factor (G-CSF) which are produced in sepsis . CD64 can be used as a diagnostic marker of bacterial infection and sepsis using flow cytometry.
The primary goal of this study was to determine whether CD64 is a useful biomarker for sepsis in adult critically ill patients. Secondly, since longitudinal data of CD64 expression are limited in the critically ill patient, a further goal was to clarify longitudinal expression patterns of CD64 on neutrophils with regard to outcome and sepsis severity.
A prospective observational study between August 2011 and March 2013 in 155 consecutive patients who were admitted with sepsis, severe sepsis or septic shock was performed in a mixed medical-surgical ICU in a university hospital in the Netherlands. CD64 analysis were performed daily until discharge from ICU or death. Demographics, clinical, laboratory data and outcome defined as 28-day survival were recorded. They were included within 24 hours from start of antibiotic treatment.
Hundred-and-fifty-five consecutive patients were enrolled. Patients with a sepsis (1.53; 1.00-2.77) showed a lower CD64 index than patients with a severe sepsis and septic shock (2.66 ;1.36-4.49) p = 0.004. Furthermore a peak value on day two and subsequently a steady decline in all three groups was seen, independent of outcome.
A significant difference in CD64 at baseline of 2.65 [1.37-4.47] versus 1.74 [0.97-3.16] (p = 0.002) was seen between patients with a positive culture and negative culture at admission, respectively. This difference persisted until two days after inclusion. CD64 index was associated with severity in organ failure (SOFA-score). the higher the SOFA score, the higher the CD64 index measured at the same day. Analysis showed no significant difference during the first 14 days with regard to CD64 index for 28-day mortality between survivors versus non-survivors, although, towards the end, non-survivors are showing higher levels.
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.