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Updated: Feb 27, 2026
Long-Term Continuous Measurement of Renal Blood Flow in Conscious Rats
Published on: February 8, 2022
Faster Blood Flow Rate Does Not Improve Circuit Life in Continuous Renal Replacement Therapy: A Randomized Controlled
Nigel Fealy1, Leanne Aitken, Eugene du Toit
11Department of Intensive Care Medicine, Austin Hospital, Melbourne, VIC, Australia. 2School of Nursing and Midwifery, Griffith University, Brisbane, QLD, Australia. 3School of Nursing and Midwifery, Deakin University, Melbourne, VIC, Australia. 4Centre for Health Practice Innovation, Griffith Health Institute, Griffith University, Brisbane, QLD, Australia. 5Intensive Care Unit, Princess Alexandra Hospital, Brisbane, QLD, Australia. 6School of Health Sciences, City, University of London, London, United Kingdom. 7School of Medical Science, Griffith University, Gold Coast, Sydney, QLD, Australia. 8Melanoma Institute Australia, Research and Biostatistics group, Wollstonecraft, NSW, Australia.
Blood flow rate does not impact circuit longevity in continuous renal replacement therapy (CRRT). This study found no significant difference in circuit life between 150 mL/min and 250 mL/min settings for CRRT.
Area of Science:
- Nephrology
- Intensive Care Medicine
- Biomedical Engineering
Background:
- Continuous renal replacement therapy (CRRT) is vital for critically ill patients.
- Optimizing CRRT circuit life is crucial for patient care and resource management.
- The influence of blood flow rate on CRRT circuit longevity requires further investigation.
Purpose of the Study:
- To investigate the effect of different blood flow rates on the circuit lifespan during continuous renal replacement therapy.
- To determine if increasing blood flow rate from 150 mL/min to 250 mL/min affects circuit clotting or duration.
Main Methods:
- A prospective randomized controlled trial was conducted in a single tertiary ICU.
- Critically ill adult patients undergoing CRRT were randomized to blood flow rates of 150 mL/min or 250 mL/min.
- Circuit life was measured in hours, with data collected until clotting or elective cessation.
Main Results:
- No significant difference in median circuit life was observed between the 150 mL/min (9.1 hours) and 250 mL/min (10 hours) groups.
- The hazard ratio for circuit clotting was 1.00 (p=0.68), indicating no increased risk at the higher flow rate.
- Anticoagulation strategies significantly impacted clotting risk, unlike patient demographics or vascular access characteristics.
Conclusions:
- Blood flow rate (150 vs. 250 mL/min) does not influence circuit life in continuous renal replacement therapy.
- Optimizing anticoagulation, rather than blood flow rate, appears more critical for preventing circuit clotting.
