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Peritoneal fluid and solute transport with different polyglucose formulations
T Wang1, O Heimbürger, H H Cheng
1Department of Clinical Science, Karolinska Institute, Huddinge University Hospital, Stockholm, Sweden.
Summary
Polyglycose solutions can remove significant peritoneal fluid in rats, with glucose addition potentially increasing fluid absorption. Adding glucose to polyglycose did not improve ultrafiltration in this 4-hour rat model study.
Area of Science:
- Nephrology and Urology
- Biomaterials Science
- Peritoneal Dialysis Research
Background:
- Peritoneal dialysis (PD) solutions are crucial for fluid and solute transport in patients with kidney failure.
- Polyglycose solutions offer potential alternatives with different osmotic properties compared to glucose-based solutions.
- Understanding the transport characteristics of various PD solutions is essential for optimizing treatment efficacy.
Purpose of the Study:
- To investigate peritoneal fluid and solute transport using polyglucose solutions with and without glucose.
- To evaluate the impact of glucose addition on ultrafiltration and peritoneal absorption rates.
- To assess polyglucose degradation and its effect on dialysate osmolality.
Main Methods:
- A 4-hour dwell study was conducted in 31 rats using three different solutions: polyglucose (PG), polyglucose with low glucose (PG1), and polyglucose with high glucose (PG2).
- Radiolabeled human albumin (RISA) was used to mark intraperitoneal volume (i.p.V) and assess fluid absorption.
- Fluid and solute (glucose, urea, sodium, potassium, total protein) transport, dialysate osmolality, and polyglucose degradation were evaluated.
Main Results:
- Higher intraperitoneal volume (i.p.V) was observed in PG1 and PG2 groups compared to PG during the initial 2 hours.
- Adding glucose increased the RISA elimination rate (fluid absorption rate), with PG2 showing the highest rate.
- Polyglycose solution demonstrated fluid removal despite low osmolality, potentially due to lower absorption rates and polymer degradation.
Conclusions:
- Polyglycose solutions can achieve significant fluid removal in a 4-hour dwell in rats, partly due to reduced fluid absorption.
- The addition of glucose to polyglucose solutions did not enhance ultrafiltration but increased peritoneal fluid absorption rates.
- Polyglycose degradation may contribute to increased dialysate osmolality, and glucose/sodium transport can be altered by glucose addition.