1985 Volume 76 Issue 6 Pages 814-821
Fractional excretion rate of pelvic urine component in 35 cases of unilaterally hydronephrotic kidney was analysed to assess functional recoverability of obstructed kidney. Compariong these results with renographic findings, pelvic emptying time and the renal concentration of contrast medium were well correlated with low fractional excretion rate of sodium. However, the degree of dilatation of calices was not correlated with the fractional excretion rate of each urinary component.
On nine cases, arteriography was performed preoperatively. The ratio between the diameter of abdominal aorta and renal artery of obstructed kidney were compared with the fractional excretion rate of each urinary component. Higher aorto-renal arterial diameter ratio, more than 20%, were corresponded to lower fractional excretion rate of sodium. less than 3%, in obstructed kidney. Good operative results were obtained in only such cases.
Late operative results were assessed radiologically in 24 cases. Improvement was obtained in cases with lower fractional excretion rate of sodium preoperatively, i. e. less than 3%. Excellent results were oblained only in cases with preoperative fractional sodium excretion rate less than 2% and of the age at operation before 15 years old.
These results indicate that, pelvic urine analysis is useful to assess functional status and recoverability of obstructed kidney. We believe that functional recovery will be expected if fractional sodium excretion rate of hydronephrotic kidney is less than 3%.
