Electrolyte Management in Continuous Renal Replacement Therapy

Key Electrolytes Requiring Close Monitoring

Phosphate levels should be closely monitored in patients receiving CRRT, as hypophosphatemia has a high reported prevalence of 60-80% in ICU patients and is associated with negative patient outcomes 1
Potassium levels should be monitored, as hypokalemia occurs in approximately 25% of patients with kidney failure started on prolonged modalities of kidney replacement therapy 1
Magnesium levels should be monitored, as hypomagnesemia affects up to 60-65% of critically ill patients and is exacerbated by CRRT, particularly when regional citrate anticoagulation is used 1, 2

The American Society for Parenteral and Enteral Nutrition recommends using dialysis solutions containing physiological concentrations of potassium, phosphate, and magnesium to prevent electrolyte disorders during CRRT 1
The use of commercial CRRT solutions enriched with phosphate, potassium, and magnesium is recommended when appropriate, as they can effectively prevent CRRT-related hypophosphatemia and limit the need for exogenous supplementation 1
Replacement and/or dialysate solutions with potassium concentration of 4 mEq/L can minimize hypokalemia during CRRT, according to the Clinical Nutrition guidelines 1
For magnesium management, higher concentration dialysis fluids are particularly important when using regional citrate anticoagulation, as recommended by Clinical Nutrition 1, 2

Electrolytes should be checked at regular intervals during CRRT, with more frequent monitoring at the initiation of therapy and adjustments based on stability, as recommended by Clinical Nutrition 1