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Simplified Citrate Anticoagulation for CRRT Without Calcium Replacement.

Marcus Broman1, Bengt Klarin, Karin Sandin

  • 1From the *Department of Clinical Sciences, Anaesthesiology and Intensive Care, Lund University, Lund, Sweden; †Gambro Lundia AB, Lund, Sweden; ‡Department of Nephrology, Lund University, Lund, Sweden; and §Department of Microbiology, Immunology and Glycobiology, Lund University, Lund, Sweden.

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This study explored a new method for continuous renal replacement therapy (CRRT) anticoagulation using citrate without needing calcium replacement. The novel approach successfully prevented clotting and maintained stable patient electrolytes, suggesting a simpler CRRT anticoagulation strategy.

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Area of Science:

  • Nephrology
  • Critical Care Medicine
  • Biomedical Engineering

Background:

  • Citrate anticoagulation is standard for continuous renal replacement therapy (CRRT) since 2012.
  • A major drawback of citrate is the requirement for calcium replacement and strict calcium level monitoring.
  • Heparin is an alternative but carries bleeding risks.

Purpose of the Study:

  • To investigate a novel CRRT anticoagulation method eliminating the need for separate calcium replacement.
  • To assess the safety and efficacy of maintaining stable total calcium and low ionized calcium in the extracorporeal circuit.

Main Methods:

  • A prospective, nonrandomized pilot study involving five acute renal failure patients.
  • Citrate and calcium were incorporated into all CRRT solutions.
  • Systemic and extracorporeal circuit electrolyte levels, including ionized calcium, were rigorously monitored.

Main Results:

  • The new method achieved effective anticoagulation with postfilter ionized calcium levels <0.5 mmol/L.
  • No filter clotting or increased filter pressures were observed.
  • Systemic electrolyte and acid-base parameters remained stable; no calcium replacement was required.

Conclusions:

  • Regional citrate anticoagulation can be performed during CRRT without separate calcium infusion.
  • This innovative approach simplifies CRRT management by eliminating calcium replacement needs.
  • Further studies are warranted to validate this promising anticoagulation strategy.