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Mechanical factors and tissue stresses in chronic hydronephrosis
Investigative Urology
|May 1, 1981
Summary
Ureteral blockage in dogs initially increases kidney pressure and volume but later decreases pressure. The ureter wall stiffens significantly over four weeks, becoming three times more resistant to stretching.
Area of Science:
- Urology
- Nephrology
- Biomedical Engineering
Background:
- Ureteral blockage can lead to significant renal pathophysiology.
- Understanding the mechanical changes in the ureter wall is crucial for managing obstructive uropathy.
Purpose of the Study:
- To investigate the temporal changes in renal pressure, volume, and ureter wall mechanics following ureteral blockage in a canine model.
Main Methods:
- Kidneys from 21 dogs were analyzed at 0, 1, 2, and 4 weeks post-ureteral blockage.
- Measurements included pressure, volume, wall thickness, wall stress, and elastic modulus.
Main Results:
- Early increases in pressure and volume were observed, followed by a decrease in pressure.
- Ureter wall volume increased, and thickness decreased, while wall stress and elastic modulus continuously increased.
- By week 4, ureter wall material resistance to stretch was approximately three times that of the normal ureter.
Conclusions:
- Ureteral blockage induces progressive stiffening of the ureter wall.
- These mechanical changes in the ureter wall are a significant compensatory response to sustained obstruction.