Comparison of different morphological parameters with duration of obstruction created experimentally in unilateral upper ureters: An animal model

Abstract

Background: The objective of the following study is to determine and to compare the different morphological parameters with duration of obstruction created experimentally in unilateral upper ureters of rats.

Materials and Methods: Unilateral upper ureteric obstruction was created in 60 adult Wistar rats that were reversed after predetermined intervals. Rats were sacrifi ced and ipsilateral kidneys were subjected for analysis of morphological parameters such as renal height, cranio-caudal diameter,
antero-posterior diameter, lateral diameter, volume of the pelvis and average cortical thickness: Renal height.

Results: Renal height and cranio-caudal diameter of renal pelvis after ipsilateral upper ureteric obstruction started rising as early as 7 days of creating obstruction and were affected earlier than antero-posterior and lateral diameter and also were reversed earlier than other parameters after reversal of obstruction. Renal cortical thickness and volume of the pelvis were affected after prolonged obstruction (> 3 weeks) and were the late parameters to be reversed after reversal of obstruction.

Conclusions: Cranio-caudal diameter and renal height were the early morphological parameters to be affected and reversed after reversal of obstruction in experimentally created ipsilateral upper ureteric obstruction.

Key words: Antero-posterior diameter, cranio-caudal diameter,  experimental upper ureteric obstruction, lumbotomy, renal height