Improvement of renal function after relief of chronic partial upper urinary tract obstruction

: kidneys functional and anatomical changes reversibility of after treatment of partial ureteropelvic junction obstruction (upjps not defined well. therefore, in this clinical trial study, weve evaluated these changes.methods: in a clinical trial study with non randomized-simple sampling, 32 patients with chronic partial obstruction of urinary tract due to unilateral upjqyere studied. in each patient, ivu, dmsa, dtpa, and bilateral kidney sonography were down pre and post operatively. paired t-test, wilcoxon, and mcnemar tests analyzed data. p-value less than 0.05 was considered significant.results: mean age of the patients was 5.44 ± 0.47 years old and 40.6 % of the patients were male. split function mean in dmsa had significant difference, comparing pre and post operatively (p&.05). there also was a significant difference in mean of retention time and t12 of dtpa (ps.05), compar ing pre and post operatively (p8.05). mean of kidney pelvis diameter had significant difference, comparing pre and post operatively (ps.05).conclusion: fir study showed that operation of chronic partial obs truction of kidney, could improve kidney function. we also showed that sonographic evaluation of kidneys could help to evaluate kidney function in these patients.