Phosphorus removal with a variable chloride, CO2 acidified dialysate using an unmodified single pass system

Area of Science:

• Nephrology
• Biomedical Engineering
• Clinical Chemistry

Background:

• Acetate in dialysate is metabolized and may influence intracellular phosphorus shifts.
• Standard hemodialysis fluid contains acetate as an acidifying agent.
• Alternative acidifying agents and their impact on phosphorus removal require investigation.

Purpose of the Study:

• To assess the technical feasibility of a novel dialysate delivery system using CO2 gas.
• To evaluate the impact of an acetate-free, variable chloride dialysate on phosphorus removal during hemodialysis.
• To compare phosphorus kinetics between acetate-containing and acetate-free dialysate.

Main Methods:

• A crossover study design was employed.
• Six hemodialysis patients participated.
• Dialysate composition (acetate-containing vs. acetate-free with CO2) was varied, and serum phosphorus and chloride levels were monitored.

Main Results:

• The CO2-based dialysate system was technically feasible and usable on standard dialysis machines.
• Higher serum chloride levels were observed during early dialysis with the new fluid.
• No significant differences in serum phosphorus levels or mass phosphorus removal were detected between the two dialysate types.

Conclusions:

• An acetate-free dialysate using CO2 is technically feasible for hemodialysis.
• Despite theoretical benefits, this acetate-free dialysate did not enhance phosphorus removal in the studied patient group.
• Further research may be needed to explore other acetate-free formulations or patient populations for improved phosphorus management.