Selenoprotein P as a prognostic biomarker of burn sepsis: A prospective cohort study

Introduction

Severely burned patients exhibit increased nutritional requirements and are at high risk of developing sepsis. Selenium is an essential trace element supporting antioxidant and anti-inflammatory pathways, mediated by incorporation into selenoproteins. The selenium status may affect sepsis risk in burn injury.

Methods

This prospective cohort study included 90 adult patients admitted to Zurich Burn Center, Switzerland. All patients received a continuous intravenous infusion of 1000 μg sodium selenite per day during the first week as part of local standard of care. Three complementary biomarkers of serum selenium status were determined at nine time-points up to six months postburn, namely total selenium, selenoprotein P, and glutathione peroxidase 3. The resulting data were correlated to clinical parameters and outcomes, with sepsis as the primary end point.

Results

A high fraction of the patients displayed selenium deficiency already at admission, and developed sepsis during hospitalization (n = 55; 61 %). Selenium status at admission was inversely related to burn severity. Low baseline selenoprotein P was associated with sepsis incidence, irrespective of trauma severity (adjusted HR, 1.94; 95 % CI, 1.05–3.63; p = 0.035). Burn severity and baseline concentrations of selenoprotein P and white blood cells together predicted sepsis with an area under the curve of 0.84 (95 % CI, 0.75–0.93; p < 0.0001). Supplemental selenium was associated with a transient normalization of selenium status.

Conclusion

Considering its rapid decline following severe burn injury, the assessment of serum selenoprotein P upon admission may contribute to an early prediction of sepsis risk.