Late results after surgical correction of pyeloplasty failure in idiopathic hydronephrosis.

Late results after a secondary pyeloplasty because of failure of the initial procedure were evaluated by glomerular filtration rate and drainage function studies in 15 patients. Total and separate glomerular filtration rates were measured using the 51chromium-ethylenediaminetetraacetic acid clearance technique and isotope renography. The drainage function of the renal pelvis was evaluated from the isotope renogram. Secondary pyeloplasty was performed 1 to 15 years (mean 8.0 years) after the first procedure because of obstruction, which was verified by diuretic urography and isotope renography. Our results show that a secondary pyeloplasty can be performed after failure of the primary procedure. Functional results 3 to 15 years after reoperation were equally good as after uncomplicated primary pyeloplasty.