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Mass transfer area coefficients in children
D F Geary1, E A Harvey, J W Balfe
1Department of Pediatrics, Hospital for Sick Children, Toronto, Ontario, Canada.
Insights
Pediatric peritoneal dialysis shows solute transport (mass transfer area coefficients) increases with age, differing from adult values. Children exhibit more rapid transport per body weight, possibly due to a larger effective peritoneal surface area.
Area of Science:
- Pediatric Nephrology
- Peritoneal Dialysis
- Solute Transport Dynamics
Background:
- Peritoneal dialysis is a vital renal replacement therapy for children.
- Understanding solute transport in pediatric patients is crucial for optimizing dialysis efficacy.
- Existing data on mass transfer area coefficients (MTAC) in children is limited compared to adults.
Purpose of the Study:
- To measure MTAC in children of varying sizes undergoing peritoneal dialysis.
- To investigate the relationship between solute transport and age in pediatric patients.
- To compare pediatric MTAC values with established adult data.
Main Methods:
- Prospective data collection from 28 children undergoing maintenance peritoneal dialysis.
- Calculation of mass transfer area coefficients (MTAC) for creatinine and glucose.
- Analysis of MTAC values in relation to patient age, body weight, and body surface area.
Main Results:
- Mean MTAC for creatinine and glucose were 4.0 and 4.5 mL/min, respectively, lower than adult values.
- MTAC scaled per kilogram body weight was higher in children than adults.
- MTAC scaled per square meter body surface area was lower in children than adults.
- A significant inverse correlation was found between MTAC per kilogram body weight and age.
Conclusions:
- Pediatric solute transport via peritoneal dialysis is age-dependent, approaching adult levels in older children.
- Children demonstrate more efficient solute transport per unit of body weight compared to adults.
- This enhanced transport per body weight may indicate a proportionally larger effective peritoneal surface area in children.
Objective:
Measurement of mass transfer area coefficients (MTAC) in children of different sizes to determine if solute transport varies with age and to compare with published adult values.
Design:
Mass transfer area coefficients calculated from prospectively collected data in 28 selected patients.
Participants:
All children starting maintenance peritoneal dialysis at the Hospital for Sick Children. Selected patients were also studied if hospitalized for unrelated reasons.
Results:
Mean MTAC values for creatinine and glucose were 4.0 and 4.5 mL/min, respectively, both considerably lower than adult values. When scaled per 70 kg body weight, these results were greater, and when scaled per 1.73 m2 surface area, they were lower than reported adult values. The MTAC/kg body weight was inversely correlated to age.
Conclusions:
Solute transport in children is directly related to age and does not approach adult values until later childhood. However, more rapid transport per unit body weight is observed in children and may reflect an increased effective peritoneal surface area.