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The peritoneal equilibration test variables in pediatric CAPD patients
M Fukuda1, K Kawamura, T Okawa
1Department of Nephrology, Tokyo Metropolitan Kiyose Children's Hospital, Japan.
Insights
The peritoneal equilibration test (PET) in children shows higher peritoneal permeability than in adults. A large residual volume (RV) in the abdominal cavity may indicate dialysate leaks, impacting treatment effectiveness.
Area of Science:
- Nephrology
- Pediatric Nephrology
- Dialysis
Background:
- The Peritoneal Equilibration Test (PET) is crucial for tailoring continuous ambulatory peritoneal dialysis (CAPD) in adults.
- Pediatric patients exhibit distinct peritoneal transport characteristics, limiting direct application of adult PET classifications.
- Understanding pediatric peritoneal function is vital for optimizing CAPD therapy in children.
Purpose of the Study:
- To evaluate the applicability of the Peritoneal Equilibration Test (PET) in pediatric CAPD patients.
- To analyze peritoneal transport parameters including D/P creatinine, D/D0 glucose, and residual volume (RV) in children.
- To investigate the correlation between PET parameters, fluid drainage, and dialysate leaks in pediatric patients.
Main Methods:
- Conducted the PET using Twardowski's standardized technique on 20 pediatric patients (1.5-24 years) undergoing CAPD.
- Calculated key PET parameters: D/P creatinine, D/D0 glucose, and residual volume (RV).
- Analyzed correlations between PET parameters, fluid drainage, and observed dialysate leaks.
Main Results:
- Pediatric patients demonstrated higher peritoneal permeability (elevated D/P creatinine and D/D0 glucose) compared to adult data.
- Significant correlations were found between creatinine/glucose levels and peritoneal fluid drainage.
- A large mean residual volume (425 ± 125 mL/m²) was identified and significantly correlated with dialysate leak occurrences.
Conclusions:
- The PET is adaptable for assessing pediatric peritoneal function, revealing higher permeability than in adults.
- Elevated residual volume (RV) serves as a potential indicator for dialysate leaks, including latent ones.
- Large RV may dilute instilled dialysate, potentially reducing drainage and metabolite transport rates in pediatric CAPD.
Abstract:
The peritoneal equilibration test (PET) is generally accepted as a valuable tool in individualizing continuous ambulatory peritoneal dialysis (CAPD) treatment schedules in adults. However, the classification of peritoneal permeability as described by Twardowski is not available for children due to differences in peritoneal transport abilities. In this paper, we report the results of the PET for 20 patients aged from 1.5 to 24 years (mean 10.3 years), who started CAPD therapy at age 0-15 years, using Twardowski's standardized technique. D/P creatinine (dialysate to plasma ratio of creatinine at 4 h), D/D0 glucose (the ratio of dialysate glucose at 4 h dwell time to dialysate glucose at 0 dwell time), and the residual volume (RV) in the abdominal cavity were calculated. The mean and standard deviation values for D/P creatinine and D/D0 glucose were of a higher permeability level than those reported in Twardowski's data. Furthermore, a significant correlation of creatinine and glucose with fluid drainage ability of the peritoneum were observed. A large amount of RV (425 +/- 125 mL/m2) was detected in the patients' peritoneal cavity and this had a significant correlation with dialysate leak occurrences. The authors suggest that the RV would be an indicator for leaks and especially latent leaks. The cause of a large RV is unknown, but there is a probability that drainage volume and transport rates of metabolites decrease because the concentration of the instilled dialysate is immediately diluted by a large RV within the peritoneum.