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Estimating glucose absorption in peritoneal dialysis using peritoneal equilibration tests

D M Bodnar¹, S Busch, J Fuchs

¹Cleveland Clinic Foundation, Ohio.

Advances in Peritoneal Dialysis. Conference on Peritoneal Dialysis

|January 1, 1993

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The D/D0 formula offers a more accurate method for calculating glucose absorption in peritoneal dialysis patients compared to the Grodstein formula. This individualized approach accounts for patient-specific factors, improving dietary energy requirement estimations.

Area of Science:

Nephrology
Clinical Nutrition
Biomedical Engineering

Background:

Accurate quantification of glucose absorbed from dialysate is crucial for determining dietary energy needs in peritoneal dialysis (PD) patients.
The existing Grodstein formula, based on limited data, may not accurately reflect individual glucose absorption.
Peritoneal equilibration test (PET) data indicate that modality and membrane transport characteristics influence glucose absorption.

Purpose of the Study:

To compare the accuracy of the D/D0 formula versus the Grodstein formula for estimating glucose absorption in PD patients.
To evaluate a more individualized and precise method for calculating glucose absorption in both continuous ambulatory peritoneal dialysis (CAPD) and automated peritoneal dialysis (APD) patients.

Main Methods:

Glucose absorption was measured over 24 hours in 50 CAPD and 17 APD patients by analyzing the glucose content in spent dialysate.

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Two formulas were compared: the Grodstein formula (based on average glucose concentration) and the D/D0 formula (derived from dialysate glucose ratios).

Statistical analysis using the Wilcoxon sign rank test was employed to determine which formula's results correlated better with actual absorbed glucose.

Main Results:

The D/D0 formula demonstrated significantly closer results to the actual measured glucose absorption in both CAPD (p = 0.0153) and APD (p = 0.0001) patient groups.
The Grodstein formula's accuracy was not explicitly detailed but implied to be less accurate based on the comparison.
The D/D0 formula proved to be easily calculable using readily available patient data.

Conclusions:

The D/D0 formula provides a more accurate and individualized method for estimating glucose absorption in peritoneal dialysis patients.
This improved estimation method can lead to better-tailored dietary energy recommendations for PD patients.
The D/D0 formula's ability to account for patient-specific modality and membrane characteristics enhances its clinical utility.