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  • Title: [Comparative study of differential renal function by DMSA and MAG-3 in congenital unilateral uropathies].
    Author: Ardela Díaz E, Miguel Martínez B, Gutiérrez Dueñas JM, Díez Pascual R, García Arcal D, Domínguez Vallejo FJ.
    Journal: Cir Pediatr; 2002 Jul; 15(3):118-21. PubMed ID: 12601986.
    Abstract:
    UNLABELLED: In congenital obstructed hydronephrosis, the assessment of the differential renal function (DRF) is essential to provide a prognosis or to determine surgical treatment. The most reliable method to measure the differential renal function is the isotopic study with DMSA. The MAG-3 is employed to evaluation renal elimination, although in the minutes 1-3 it also measures the differential renal function. OBJECTIVE: We compared the estimation of differential renal function by 99Tc-dimercapto-succinic acid (DMSA) and 99Tc-mercaptoacetyltriglycyne (MAG-3) methods in congenital unilateral uropathies. MATERIALS AND METHODS: We reviewed the results of 138 isotopic studies of children (age range: 0-9 years) with congenital unilateral uropathies: 67 cases were obstructed and 71 non-obstructed. In all of them were carried out match tests pairs with DMSA and MAG-3. Both series were divided into 4 groups: 1) DRF < 40%, 2) DRF 40-45%, 3) DRF 46-50% and 4) DRF > 50%. The measurement differential renal function correlation by DMSA and MAG-3 were analysed. RESULTS: The coefficient of correlation was 0.96 (P < 0.01) in obstructed unilateral uropathy and 0.92 (P < 0.01) in non-obstructed serie. CONCLUSIONS: The differential renal function measured with DMSA and MAG-3 has a close correlation in congenital unilateral uropathies. Therefore in obstructed types, differential renal function and half-time elimination can be reliable and sure studied with MAG-3, being unnecessary DMSA test, avoiding additional radiation to the children.
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