Saline flushing to prevent circuit clotting during CRRT without anticoagulant: a randomized controlled study

Area of Science:

• Nephrology
• Critical Care Medicine
• Clinical Trials

Background:

• Regional citrate anticoagulation (RCA) is standard for continuous renal replacement therapy (CRRT).
• Saline flushing is an alternative when anticoagulants are contraindicated, but its efficacy is uncertain.
• This study investigated saline flushing strategies in anticoagulant-free CRRT.

Purpose of the Study:

• To evaluate the efficacy of different saline flushing frequencies in preventing circuit clotting during anticoagulant-free CRRT.
• To assess the impact of saline flushing on CRRT dose delivery, circuit lifespan, and patient outcomes.

Main Methods:

• A prospective, three-arm randomized controlled trial involving critically ill patients requiring CRRT without anticoagulation.
• Patients were randomized to 30-minute flush, 2-hour flush, or no-flush groups.
• Primary outcome was circuit lifespan; secondary outcomes included delivered CRRT dose, filtration fraction, nurse satisfaction, and hypotension incidence.

Main Results:

• The 30-minute flush group had a significantly shorter circuit lifespan compared to the 2-hour and no-flush groups.
• Frequent flushing was associated with reduced CRRT dose delivery, higher filtration fraction, and lower nurse satisfaction.
• The 30-minute flush group showed a higher incidence of hypotension.

Conclusions:

• Frequent saline flushing is not effective in preventing circuit clotting during anticoagulant-free CRRT.
• Saline flushing may negatively impact CRRT efficacy and patient safety, increasing hypotension risk.
• Cautious use of saline flushing is advised in anticoagulant-free CRRT settings.