Phosphate addition to hemodiafiltration solutions during continuous renal replacement therapy

Area of Science:

• Nephrology
• Intensive Care Medicine
• Clinical Chemistry

Background:

• Hypophosphatemia is a common complication in patients undergoing continuous renal replacement therapy (CRRT).
• Phosphate supplementation in dialysate and replacement solutions can manage phosphate levels.
• The potential for calcium-phosphate precipitation in these solutions is a significant concern.

Purpose of the Study:

• To evaluate the risk of calcium-phosphate precipitation when phosphate is added to commonly used CRRT solutions (Hemosol LG2 and Hemosol B0).
• To assess the stability of calcium and phosphate levels in CRRT patients receiving phosphate supplementation.
• To determine the clinical safety and efficacy of this phosphate supplementation method.

Main Methods:

• An experimental study tested phosphate addition to lactate- and bicarbonate-based CRRT solutions.
• Precipitation was visually assessed after phosphate addition.
• A retrospective observational study evaluated calcium and phosphate homeostasis in 20 CRRT patients receiving phosphate supplementation.

Main Results:

• Addition of potassium phosphate to Hemosol solutions did not cause precipitation.
• Total and ionized calcium, phosphate, pH, PCO(2), and bicarbonate levels remained stable for 5 hours.
• Phosphate levels were stable throughout CRRT in most patients, with no adverse effects on homeostasis.

Conclusions:

• Phosphate supplementation can be safely added to Hemosol CRRT solutions without risk of calcium precipitation.
• This method effectively prevents hypophosphatemia in CRRT patients.
• The findings support the routine use of phosphate-supplemented solutions in CRRT.