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Baxter Healthcare Corporation, Renal Division, McGaw Park, Illinois, USA.
OBJECTIVES: The aims of the current study were: (1) to determine the effects of peritoneal dialysis (PD) solutions at different glucose concentrations on the growth of cultured cells; (2) to determine whether a bicarbonate/lactate-based solution, as a result of the configuration of its components during heat sterilization in a two-chambered bag, was lower in glucose degradation products than a corresponding lactate-based PD solution; and (3) to determine whether lower glucose degradation corresponded to a decreased inhibition of cell growth. DESIGN: Growth inhibition of cells exposed to lactate-based PD solutions at three different glucose concentrations was determined. Bicarbonate/lactate-based and lactate-based solutions at high glucose concentration (3.86%) were further analyzed for presence of glucose degradation products and inhibition of cell growth. METHODS: Cell growth was determined by neutral red uptake, measured by optical density at 540 nm. Glucose degradation to acetaldehyde or fructose was determined by gas chromatography-mass spectroscopy and high-performance liquid chromatography. RESULTS: Only 3.86% glucose lactate-based PD solution caused significant inhibition of cell growth (p < 0.05). The heat-sterilized, bicarbonate/dlactate-based solution (3.86% glucose) had lower levels of fructose and acetaldehyde than a conventional heat-sterilized, lactate-based solution with the same glucose concentration. Growth of cultured cells exposed to the bicarbonate/lactate-based solution was significantly improved (p < 0.05) over growth in the conventional solution. CONCLUSIONS: The bicarbonate/lactate-based solutions, manufactured and heat-sterilized in two-chambered bags, were lower in glucose degradation products than that corresponding lactate-based PD solutions, and demonstrated improved in vitro biocompatibility as measured by the growth of cultured cells.
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