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Comparison of plasma clearances of polyfructosan and 51Cr-EDTA in children
Insights
Glomerular filtration rate (GFR) estimates using polyfructosan and 51Cr-EDTA clearances are interchangeable in children when using two-compartment analysis and single injection methods.
Area of Science:
- Nephrology
- Pediatric Nephrology
- Diagnostic Imaging
Background:
- Accurate assessment of glomerular filtration rate (GFR) is crucial for diagnosing and managing pediatric renal diseases.
- Polyfructosan and 51Cr-EDTA are commonly used markers for GFR determination.
- Single injection procedures offer a convenient method for GFR measurement in children.
Purpose of the Study:
- To compare GFR values obtained from polyfructosan and 51Cr-EDTA clearances in children.
- To evaluate the accuracy of one-compartment and two-compartment analyses for 51Cr-EDTA GFR estimation.
- To assess the influence of age on the correlation between different GFR measurement methods.
Main Methods:
- Plasma clearances of polyfructosan and 51Cr-EDTA were measured in 38 children with renal diseases and 5 healthy children.
- GFR was calculated using single injection procedures with both one-compartment (Cr-EDTA-1) and two-compartment (Cr-EDTA-2) analyses for 51Cr-EDTA.
- Children were stratified into two age groups: below 6 years and 8-16 years.
Main Results:
- Both Cr-EDTA-1 GFR and Cr-EDTA-2 GFR showed significant correlations with polyfructosan GFR across all children.
- Correlation coefficients were higher in older children (r=0.91-0.93) compared to younger children (r=0.73-0.74).
- No significant differences were found between polyfructosan GFR and Cr-EDTA-2 GFR, while Cr-EDTA-1 GFR was 16% higher.
Conclusions:
- GFR estimates derived from polyfructosan and 51Cr-EDTA clearances using two-compartment analysis and single injection are interchangeable in children.
- Two-compartment analysis of 51Cr-EDTA decay curves provides a reliable GFR measurement comparable to polyfructosan clearance.
- Age influences the correlation strength between GFR estimation methods, highlighting the importance of age-specific interpretation.
Abstract:
Plasma clearances of polyfructosan and 51Cr-EDTA were determined in 38 children with renal diseases and in five healthy children in order to compare the values for the glomerular filtration rate (GFR) obtained by single injection procedures. Both one-compartment (Cr-EDTA-1) and two-compartment (Cr-EDTA-2) analyses were made of the isotope decay curve. The children were divided into two age groups: (a) 24 children below 6 years, and (b) 19 children between 8 and 16 years of age. In both groups Cr-EDTA-1 GFR and Cr-EDTA-2 GFR correlated significantly with polyfructosan GFR. The correlation coefficients, however, were somewhat lower in the younger (r = 0.74, r = 0.73) than in the older children (r = 0.91, r = 0.93). There were no significant differences between simultaneously obtained polyfructosan GFR and Cr-EDTA-2 GFR based on paired observations while Cr-EDTA-1 GFR was somewhat higher (16%) than the simultaneously obtained polyfructosan GFR. We conclude that estimates of GFR from polyfructosan and Cr-EDTA clearances based on two compartment analyses and single injection procedures are interchangeable.