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Metabolic consequences of peritoneal dialysis
1Department of Internal Medicine, Section on Nephrology, Wake Forest University School of Medicine, Medical Center Boulevard, Winston-Salem, NC 27157-1053, USA. jburkart@wfubmc.edu
Seminars in Dialysis
|January 22, 2005
Summary
Optimizing peritoneal dialysis (PD) involves managing fluid balance using osmotic agents. Alternative solutions like amino acids and icodextrin offer different absorption profiles and potential ultrafiltration advantages over traditional glucose-based solutions.
Area of Science:
- Nephrology
- Biomedical Engineering
Background:
- Peritoneal dialysis (PD) prescription optimization aims to normalize blood pressure and extracellular volume.
- Ultrafiltration is achieved using crystalloid or colloid osmotic agents, which are systemically absorbed with potential benefits and adverse effects.
Purpose of the Study:
- To compare the systemic absorption, caloric load, and ultrafiltration characteristics of glucose-based dialysate solutions with alternative agents.
- To evaluate the potential risks and benefits of alternative osmotic agents in PD.
Main Methods:
- Review of systemic absorption rates and caloric loads for glucose, amino acid, and macromolecular (polypeptide, polyglucose/icodextrin) osmotic agents.
- Analysis of ultrafiltration mechanisms and efficiency differences between crystalloid (glucose) and colloid (macromolecular) osmotic agents.
Main Results:
- Glucose-based PD solutions result in significant daily glucose absorption (300-450 kcal) and protein losses (~10 g/day).
- Alternative agents like amino acids and icodextrin exhibit different systemic absorption rates and caloric profiles.
- Macromolecular solutions achieve ultrafiltration via colloid osmotic pressure, with potentially lower systemic absorption compared to glucose.
Conclusions:
- Alternative dialysate solutions may offer advantages in ultrafiltration and caloric load management compared to traditional glucose-based PD fluids.
- Further research is necessary to fully elucidate the risks and benefits of alternative osmotic agents in peritoneal dialysis.