非閉塞性上部尿路感染症における腎シンチグラフィーによる分腎機能検査
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Kidney function study was carried out in 90 patients with non-obstructive upper urinary tract infection using 99m-Tc-DMSA renal scintigraphy. 1) 99m-Tc-DMSA renal scintigram demonstrated well pyelonephritic cortical lesions which were not easily visualized on IVP. 2) A variety of 99m-Tc-DMSA renal uptake paralleled the grading of pyelonephritic changes on IVP, however, there was a discrepancy between some of grade II pyelonephritic changes in reflux kidneys and DMSA renal uptake. This may be partly attributed to hydrodynamic effects of VUR in addition to inflammatory changes. The severity of reflux and changes in pelviocaliceal system on VCG also paralleled DMSA renal uptake in reflux kidneys. 3) A ratio of 99m-Tc-DMSA renal uptake in the healthy side to that in pathological side was observed in 23 cases with VUR before and after the anti-VUR operation was performed. In patients with more than 3.5 of preoperative DMSA uptake ratio, there were few increments postoperatively in kidney functions of the pathological side, while the contralateral healthy kidney showed a compensatory increase in kidney functions. This DMSA renal uptake ratio between healthy and pathological side seems to be one of predictable determinants for postoperative recovery of the pathological side. Thus, by comparing the DMSA uptake between right and left kidney in the chronic course or pre- and postoperative periods, an effect of renal function in the pathological side on that in the healthy side was investigated from the point of renal counterbalance.
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