Gammagrafía paratiroides 99mTc-sestamibi en paciente con hiperparatiroidismo secundario recidivante tras paratiroidectomía total y autotrasplante / 99mTc-sestamibi parathyroid scintigraphy in patient with secondary recurrent hyperparathyroidism after total parathyroidectomy and self-transplant

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[Relative renal function based on DMSA uptake corrected for volume: normalized relative renal function]. / Función renal relativa basada en captación de ácido dimercaptosuccínico corregida por volumen: función renal relativa normalizada.

OBJECTIVE: Relative renal function (RRF) quantification based on dimercaptosuccinic acid (DMSA) uptake is an established method for determining differential renal function. An abnormal kidney size may lead to an alteration in its RRF value, although it has no dysfunction. Therefore, it is useful to correct RRF values taking into account relative renal volumes, thus obtaining the normalized relative renal function (NRRF). The feasibility of the method used for volume correction, differences with respect to usual quantification and different normality intervals were studied. MATERIAL AND METHODS: A total of 187 DMSA renal scintigraphies (130 children and 57 adults) were studied. RRF was quantified and volume corrected to obtain NRRF. Patients were classified as normal or pathological using various normality intervals for NRRF. A second classification was performed depending on how the diagnostic changed after volume correction. RESULTS: An increase of pathological diagnosis was observed after volume correction, mainly in children. Using an intermediate estimation for the normality interval, 53% of the initially pathological diagnosis for children may be caused simply by different renal volumes. CONCLUSIONS: NRRF provides complementary information to RRF and helps to distinguish between a smaller kidney and a really hypofunctioning one in cases with abnormal RRF.

Función renal relativa basada en captación de ácido dimercaptosuccínico corregida por volumen: función renal relativa normalizada / Relative renal function based on DMSA uptake corrected for volume: normalized relative renalfunction

Objetivo. La cuantificación de la función renal relativa (FRR) basada en la incorporación de ácido dimercaptosuccínico (DMSA) es un método establecido para la determinación del nivel de funcionamiento renal. Un tamaño anormal del riñón puede producir una alteración en el valor de su FRR, aunque no tenga disfunción alguna. Por tanto, resulta de utilidad corregir por volumen renal relativo los valores de la FRR, obteniendo así la función renal relativa normalizada (FRRN). En este trabajo se estudiará la viabilidad del método utilizado para la corrección por volumen, las diferencias respecto a la cuantificación habitual, y la influencia del margen de normalidad a aplicar. Material y métodos. Se estudiaron las gammagrafías renales con 99mTc-DMSA de 187 pacientes, 130 infantiles y 57 adultos. Se cuantificó la FRR y se corrigió por volumen para evaluar la FRRN. Se clasificaron los pacientes en normales o patológicos estableciendo varios márgenes de normalidad para la FRRN. Se realizó una segunda clasificación de los casos según cómo cambió su valoración al corregir por volumen. Resultados. Se observó un aumento de los diagnósticos patológicos al corregir por volumen, sobre todo en niños. Para el margen de normalidad aceptado se observó que del total de casos infantiles diagnosticados como patológicos inicialmente, el 53 % puede ser debido simplemente a una diferencia de volumen renal. Conclusiones. La FRRN proporciona una información complementaria a la FRR y ayuda a distinguir entre un riñón de menor tamaño y uno realmente hipocaptante en el caso de que la FRR resulte fuera de la normalidad

Objective. Relative renal function (RRF) quantification based on dimercaptosuccinic acid (DMSA) uptake is an established method for determining differential renal function. An abnormal kidney size may lead to an alteration in its RRF value, although it has no dysfunction. Therefore, it is useful to correct RRF values taking into account relative renal volumes, thus obtaining the normalized relative renal function (NRRF). The feasibility of the method used for volume correction, differences with respect to usual quantification and different normality intervals were studied. Material and methods. A total of 187 DMSA renal scintigraphies (130 children and 57 adults) were studied. RRF was quantified and volume corrected to obtain NRRF. Patients were classified as normal or pathological using various normality intervals for NRRF. A second classification was performed depending on how the diagnostic changed after volume correction. Results. An increase of pathological diagnosis was observed after volume correction, mainly in children. Using an intermediate estimation for the normality interval, 53 % of the initially pathological diagnosis for children may be caused simply by different renal volumes. Conclusions. NRRF provides complementary information to RRF and helps to distinguish between a smaller kidney and a really hypofunctioning one in cases with abnormal RRF