A target-oriented algorithm for maintaining serum calcium stability automatically in regional citrate...

Area of Science:

• Nephrology
• Critical Care Medicine
• Biochemistry

Background:

• Regional citrate anticoagulation (RCA) is common for renal replacement therapy in critically ill patients.
• Concerns include labor-intensive monitoring and hypocalcemia associated with RCA.
• This study aimed to develop and assess a safe RCA prescribing algorithm.

Purpose of the Study:

• To provide a standardized algorithm for regional citrate anticoagulation (RCA) dosing.
• To evaluate the safety and efficacy of the algorithm in maintaining calcium stability.
• To reduce the incidence of hypocalcemia during renal replacement therapy.

Main Methods:

• A randomized study involving 18 hemofiltration treatments with calcium-free replacement solution.
• Participants received either an algorithm-based or trial-and-error RCA protocol.
• Measurements included effluent volume, post-filter and in vivo ionized calcium (iCa), and serum/effluent calcium levels.

Main Results:

• The algorithm-based RCA group maintained serum iCa levels above 0.9 mmol/L without adjustments.
• The trial-and-error group experienced serum iCa below 0.9 mmol/L and required frequent calcium supplementation.
• No participants exceeded a post-filter iCa of 0.4 mmol/L in either group.

Conclusions:

• A safe algorithm for calcium supplementation in RCA was developed.
• The algorithm effectively maintains serum calcium stability during renal replacement therapy.
• This approach eliminates the need for additional calcium adjustments, simplifying patient management.