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Biocompatible membranes in acute renal failure: prospective case-controlled study
1Medizininische Klinik, Ludwig-Maximillians University Munich, Germany.
Abstract:
The mortality of critically ill patients with acute renal failure has been halved through intervention by haemodialysis. However, several reports suggest that the course of the disorder may be prolonged by this procedure. Our prospective randomised study was done to see whether the generation of inflammatory mediators by bio-compatible membranes has an adverse effect on the outcome of acute renal failure. 52 patients, similar in age, severity of acute renal failure, general disease status (APACHE II), and management of acute renal failure or its related conditions, were divided into two groups. Haemodialysis was done with cuprophane or polyacrylonitrile membranes. Cuprophane membranes induced intense activation of the complement system (as judged by measurement of C3a) and lipooxygenase pathway (leukotriene B4) resulting in alterations of neutrophil kinetics and function. The cuprophane group had a lower survival rate (38 vs 65%), a higher proportion of patients dying from sepsis (71 vs 40%), required more haemodialysis sessions (12 vs 9), and demonstrated delayed resolution and recovery from acute renal failure than the polyacrylonitrile group. The difference in mortality regarding lethal sepsis as cause of death was statistically significant. Our observations indicate that the outcome of critically ill patients with acute renal failure may be influenced by bio-incompatibility reactions to the dialysis membrane. These results have direct implications for such patients on haemodialysis.
Insights
Dialysis membranes can impact acute renal failure outcomes. Cuprophane membranes triggered inflammation, leading to lower survival rates and delayed recovery in critically ill patients compared to polyacrylonitrile membranes.
Area of Science:
- Nephrology
- Critical Care Medicine
- Biomaterials Science
Background:
- Hemodialysis has reduced mortality in critically ill patients with acute renal failure.
- Concerns exist that hemodialysis may prolong the disorder's course.
- The role of dialysis membrane biocompatibility in patient outcomes requires further investigation.
Purpose of the Study:
- To investigate whether inflammatory mediators generated by biocompatible dialysis membranes adversely affect the outcome of acute renal failure.
- To compare the clinical outcomes of acute renal failure patients treated with cuprophane versus polyacrylonitrile membranes.
Main Methods:
- Prospective randomized study involving 52 critically ill acute renal failure patients.
- Patients were divided into two groups, receiving hemodialysis with either cuprophane or polyacrylonitrile membranes.
- Assessed complement system activation (C3a) and leukotriene B4 generation, alongside neutrophil kinetics and function.
Main Results:
- Cuprophane membranes induced significant complement activation and leukotriene B4 production, altering neutrophil behavior.
- The cuprophane group exhibited lower survival rates (38% vs. 65%) and a higher mortality from sepsis (71% vs. 40%).
- Patients with cuprophane membranes required more dialysis sessions and showed delayed recovery from acute renal failure.
Conclusions:
- Bioincompatibility reactions to dialysis membranes can negatively influence outcomes in critically ill acute renal failure patients.
- The choice of dialysis membrane material may impact patient survival and recovery trajectories.
- These findings have direct clinical implications for managing patients undergoing hemodialysis.