Changes of Early Sepsis Biomarker Presepsin Level during Hemodialysis: Influence of β2-Microglobulin Clearance of Dialysis Membrane: A Preliminary Study

Background: Although presepsin (P-SEP) is an early sepsis biomarker, sepsis is often suspected after starting hemodialysis (HD). To enhance the utility of P-SEP, we investigated whether pre-HD P-SEP levels could be predicted using the P-SEP levels from blood samples collected after starting HD. Methods: We observed P-SEP level changes due to HD and dialyzer passage in HD patients using a dialysis membrane with a beta(2)-microglobulin (beta(2)-MG) clearance of either >= 50 mL/min (high-flux) or <30 mL/min (intermediate-flux). We calculated the removal ratios for the elimination of P-SEP or the predicted pre-HD P-SEP levels based on the correction of hemoconcentration. Results: The P-SEP levels significantly decreased at 4 h after starting HD (n = 8) using membranes with a beta(2)-MG clearance >= 50 mL/min; the removal ratios at 2 and 4 h were 42.8 +/- 7.9% and 58.8 +/- 18.4%, respectively. In contrast, the P-SEP levels did not decrease during the passage of dialyzer in 2 patients with a beta(2)-MG clearance <30 mL/min, and the P-SEP levels increased during HD in all patients (n = 10, including the abovementioned 2 patients) with a beta(2)-MG clearance <30 mL/min. The predicted pre-HD P-SEP levels (y) were strongly correlated with the actually measured pre-HD P-SEP levels (x) (R-2 = 0.9562) using the regression equation: y = 1.0987x. Conclusion: The levels of P-SEP with a molecular weight near that of beta(2)-MG decreased similarly to those of beta(2)-MG during HD using membranes with a beta(2)-MG clearance >= 50 mL/min. On the contrary, the levels of P-SEP rather increased during HD with a beta(2)-MG clearance <30 mL/min, suggesting that P-SEP appeared not to be eliminated. Furthermore, the pre-HD P-SEP levels might be predictable by the correction of hemoconcentration using even blood samples collected after starting HD with a beta(2)-MG clearance <30 mL/min. (C) 2018 S. Karger AG, Basel