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Continuous Renal Replacement Therapy (CRRT) is an essential intervention for patients experiencing severe kidney dysfunction. This therapy offers a continuous mechanism for removing fluids and toxins from the bloodstream, leveraging the patient’s blood pressure to facilitate filtration through a specialized filter. This method contrasts with intermittent dialysis, providing a gentler and more consistent removal of waste products and excess fluid, which is particularly beneficial in critically...
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Related Experiment Video

Updated: Jun 4, 2026

Use of a Hanging-weight System for Isolated Renal Artery Occlusion
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Diffusive Versus Convective Continuous Renal Replacement Therapy for Acute Kidney Injury: A Systematic Review and

Fatima Masud1, Abdul Rehman Arshad2, Sohail Sabir3

  • 1Department of Medicine, Pak Emirates Military Hospital, Rawalpindi, Pakistan.

Therapeutic Apheresis and Dialysis : Official Peer-Reviewed Journal of the International Society for Apheresis, the Japanese Society for Apheresis, the Japanese Society for Dialysis Therapy
|February 20, 2026
PubMed
Summary

Continuous renal replacement therapy (CRRT) using diffusive or convective solute clearance modes showed no significant differences in patient mortality or renal recovery. Diffusive CRRT, however, demonstrated a longer filter lifespan due to reduced clotting.

Keywords:
acute kidney injurycontinuous venovenous hemodiafiltrationcontinuous venovenous hemodialysiscontinuous venovenous hemofiltrationcritical illness

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Area of Science:

  • Nephrology
  • Critical Care Medicine
  • Renal Replacement Therapy

Background:

  • Continuous renal replacement therapy (CRRT) is a critical intervention for acute kidney injury.
  • The choice between diffusive and convective solute clearance strategies in CRRT is debated.
  • Understanding the impact of CRRT modality on patient outcomes is essential.

Purpose of the Study:

  • To compare the effects of diffusive versus convective solute clearance in CRRT on mortality and renal recovery.
  • To evaluate the influence of CRRT modality on intensive care unit (ICU) length of stay.
  • To assess the incidence of filter clotting with different CRRT strategies.

Main Methods:

  • Systematic review and meta-analysis of observational studies and randomized controlled trials.
  • Searched PubMed, Cochrane Library, and LILACS databases.
  • Assessed risk of bias using Cochrane ROB 2 and ROBINS-I tools.

Main Results:

  • Thirteen studies involving 1146 patients were included.
  • No significant differences were found in ICU mortality, 28-day mortality, renal recovery, or ICU length of stay between diffusive and convective CRRT.
  • Filter clotting occurred 31% less frequently with diffusive CRRT.

Conclusions:

  • Diffusive and convective CRRT modalities yield similar outcomes regarding mortality and renal recovery.
  • Diffusive CRRT offers an advantage of reduced filter clotting, potentially extending filter lifespan.
  • The choice of CRRT modality may be guided by filter longevity considerations in addition to patient outcomes.