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[Age-dependency of isotope drainage in diuretic renograms]
R Beetz1, P Bartenstein, R Stein
1Universitätskinderklinik, Mainz, Germany.
Insights
Normal isotope drainage values in diuretic renograms for children are age-dependent, especially in the first weeks of life. Measurements in normal contralateral renal units help interpret results for urinary tract dilation.
Area of Science:
- Pediatric Nephrology
- Nuclear Medicine Imaging
- Renal Physiology
Context:
- Diuretic renography is crucial for evaluating pediatric urinary tract dilation.
- Establishing age-specific normal values for isotope drainage is essential for accurate interpretation.
- Sonographically normal contralateral renal units serve as a reference in cases of unilateral obstruction or megaureters.
Purpose:
- To determine normal isotope drainage values in diuretic renograms for various pediatric age groups.
- To assess the influence of age on technetium-(99m)MAG3 clearance and furosemide response.
- To evaluate the reliability of measurements in sonographically normal contralateral renal units.
Summary:
- Isotope drainage shows significant age-dependency in the first weeks of life.
- Measurements in normal contralateral renal units are reliable when performed after the initial six weeks.
- Diuretic renogram interpretation is improved by using age-referred normal values from contralateral units.
Impact:
- Provides essential reference data for pediatric diuretic renography.
- Enhances diagnostic accuracy in managing pediatric urinary tract abnormalities.
- Minimizes interpretation errors in renograms, particularly in cases of urinary tract dilation.
Objective:
The aim of the study was to establish normal values of the isotope drainage in diuretic scintigrams for children of different age-groups. Isotope drainage was determined 30 minutes after the application of technetium- (99m)MAG 3 as well as 15 minutes after the following application of furosemide.
Methods:
We analysed the data from 274 investigations in sonographically normal renal units (RU) contralateral to kidneys with ureteropelvic junction obstruction or non-refluxing primary megaureters.
Results:
There was a significant age-dependency of isotope drainage during the first weeks of life. In 79 RU the results of the first diuretic renogramm were compared with the follow-up examinations. The reliability of the measurements was lowest in children initially investigated during the first six weeks of life. If both the investigations were performed thereafter, no significant difference was found between the results.
Conclusions:
The isotope drainage of the sonographically normal contralateral RU seems to be a sufficient marker for the meaningfulness of the diuretic renogram. In urinary tract dilatation, mistakes regarding the interpretation of isotope drainage may be minimized by taking the measurements in the normal contralateral RU in account and by comparing them with age-referred normal values.