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[Relative renal function based on DMSA uptake corrected for volume: normalized relative renal function].

J Gimeno Olmos1, J F Martí Vidal, P Bello Arqués

  • 1Servicio de Medicina Nuclear, Hospital Universitario La Fe, Valencia, España. marti_jfr@gva.es

Revista Espanola De Medicina Nuclear
|June 10, 2006
PubMed
Summary
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Normalized relative renal function (NRRF) corrects dimercaptosuccinic acid (DMSA) uptake values for kidney size. This volume correction improves accuracy, especially in children, by distinguishing true kidney dysfunction from size-related variations.

Area of Science:

  • Nuclear medicine
  • Pediatric nephrology
  • Medical imaging analysis

Context:

  • Relative renal function (RRF) based on DMSA uptake is standard for differential renal function assessment.
  • Abnormal kidney size can falsely alter RRF, suggesting dysfunction where none exists.

Purpose:

  • To evaluate the feasibility of volume correction for RRF, yielding normalized relative renal function (NRRF).
  • To compare NRRF with standard RRF quantification and assess different normality intervals.
  • To determine the impact of volume correction on diagnostic classification.

Summary:

  • 187 DMSA renal scintigraphies (130 children, 57 adults) were analyzed for RRF and NRRF.
  • Patients were classified using various NRRF normality intervals, with a secondary classification based on diagnostic changes post-correction.

Related Experiment Videos

  • Volume correction led to an increase in pathological diagnoses, particularly in children, with 53% of initial pediatric diagnoses potentially due to size variations.

    • Impact:

    • NRRF offers complementary information to RRF, aiding in differentiating small, normally functioning kidneys from truly hypofunctioning ones.
    • Volume correction refines the interpretation of DMSA scans, improving diagnostic accuracy for renal function, especially in pediatric populations.