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[Pyelonephritic scar formation]
1Urologische Universitätsklinik Hamburg.
Insights
Pyelonephritic scars rarely form from urinary tract infections (UTIs) alone. Key risk factors like vesicoureteral reflux (VUR) in early childhood significantly increase scar development risk, even with antireflux operations.
Area of Science:
- Pediatric Nephrology
- Urology
- Infectious Diseases
Context:
- Pyelonephritic scars are indicators of kidney damage from urinary tract infections (UTIs).
- Understanding the etiology of pyelonephritic scars is crucial for preventing long-term renal sequelae.
- The development of these scars is multifactorial, involving infection and specific anatomical or functional abnormalities.
Purpose:
- To elucidate the primary risk factors contributing to the development of pyelonephritic scars.
- To differentiate the role of isolated urinary tract infections versus combined risk factors in scar formation.
- To assess the impact of age and antireflux surgery on scar development in children with vesicoureteral reflux.
Summary:
- Pyelonephritic scars seldom arise from uncomplicated urinary tract infections (UTIs).
- Significant risk factors include vesicoureteral reflux (VUR), intrarenal reflux, obstructive uropathy, and nephrolithiasis.
- The highest incidence of scarring occurs in early childhood due to the combination of UTIs, VUR, and intrarenal reflux; isolated UTIs rarely cause scarring.
Impact:
- Identifies that UTIs alone are insufficient for pyelonephritic scar formation.
- Highlights the critical role of VUR and other factors in pediatric renal scarring.
- Suggests that antireflux surgery may not alter scar risk in children over three with VUR and UTIs.
Abstract:
Pyelonephritic scars almost never develop after urinary tract infections alone, but require certain risk factors in addition. The most important risk factors are: vesicoureteral reflux, intrarenal reflux, obstructive uropathy, and nephrolithiasis. Most pyelonephritic scars develop in early childhood with the combination of vesico-ureteral reflux, intrarenal reflux, and urinary tract infections. Urinary tract infections alone almost never result in pyelonephritic scars. After the age of 3 years the risk developing pyelonephritic scars is not more than 10% in those with the combination of urinary tract infections and vesicoureteral reflux. In this age group the risk developing pyelonephritic scars is not altered by antireflux operation.