Cytokine Clearances in Critically Ill Patients on Continuous Renal Replacement Therapy.

Background/aims: We sought to quantify any differences in cytokine clearance between continuous venovenous hemofiltration (CVVH-convective) compared to continuous venovenous hemodialysis (CVVHD-diffusive).

Methods: We conducted a 20 patient, multicenter, prospective, open-label randomized trial (CVVH or CVVHD) at continuous renal -replacement therapy (CRRT) initiation. Blood, urine, and effluent were collected at 0, 4, 24, and 48 h after initiation of CRRT. Serum electrolytes, cytokines levels, and clearances were measured. Cytokines studies included IL-1β, IL-1RA, IL-6, IL-10, and TNFα.

Results: We randomized 20 patients to receive CRRT. After 4 h of CRRT there was no difference in total cytokine levels or change in cytokine concentrations across the 2 groups. With the exception of IL-1 RA, all cytokines levels decreased across patient groups regardless of modality. There was no significant difference in cytokine concentration across CRRT modality for any time point.

Conclusion: Within the first 4 h of CRRT initiation, there is no significant difference between cytokine or solute clearance between CVVH and CVVHD.