Abstract
The aim of the study is to evaluate the minimum number of renal scans required to
follow pediatric patients postpyeloplasty. We prospectively reviewed the renal scans
of 145 children with unilateral pelvi-ureteric junction obstruction who underwent
dismembered pyeloplasty. Patients were then divided into four groups based on preoperative
split renal function. All patients were followed with renal scan and ultrasound for
minimum of 4 years. Renal scan and ultrasound were done after stent removal at 3,
6, and 12 months and then yearly after surgery. Drainage pattern (T1/2) was seen in
all groups, except in patients where there was no comment on drainage pattern. Statistical
analysis was performed using the Friedman ANOVA and Wilcoxon signed-ranks test as
a post hoc test with Bonferroni correction and Kruskal–Wallis test with Mann–Whitney U-test
as a post hoc test with Bonferroni correction. On comparison of the pattern of drainage with time
in Groups 1–4, it was found that there was no significant difference with time in
Group 1. Then, further, using Wilcoxon signed-rank test as post hoc test for Friedman ANOVA, Group 2 showed statistically significant difference in drainage
pattern in scans between 6 months and 1 year, Group 3 showed statistically significant
difference in drainage pattern in scans between 3 months and 1 year, and Group 4 showed
statistically significant difference in drainage pattern in scans done between 3 and
6 months (P < 0.05). Minimum of three renal scans were required for paediatric patients post
pyeloplasty at 3 months, 6 months and 1 year in the follow up period.
Keywords
Drainage - pelvi-ureteric junction obstruction - pyeloplasty - renal scan
