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Early primary valve ablation for posterior urethral valves
1Division of Pediatric Urology, University of Washington School of Medicine, Children's Hospital and Medical Center, Seattle 98105, USA.
Insights
Early valve ablation (EVA) improves survival for infant boys with posterior urethral valves. This treatment allows damaged bladders and upper tracts to heal, maximizing urinary tract function.
Area of Science:
- Pediatric Urology
- Endourology
- Nephrology
Background:
- Posterior urethral valves (PUV) cause urethral obstruction, leading to urinary tract abnormalities.
- Improved survival in infant boys with PUV is noted due to early diagnosis and advanced endoscopic techniques.
Observation:
- Sequelae of PUV include damage to the urethra, bladder, ureters, and kidneys.
- Early valve ablation (EVA) allows the bladder and upper tracts to potentially heal post-obstruction.
- Patients undergoing EVA show improved bladder capacity, compliance, and reflux resolution within a year.
Findings:
- Renal insufficiency in PUV patients is often due to primary renal dysplasia, leading to potential renal failure.
- Upper tract diversion has not improved long-term outcomes in renal dysplasia and can impair bladder healing.
- EVA is suggested as the definitive treatment for PUV, even in cases of renal insufficiency.
Implications:
- EVA maximizes the potential for urinary tract healing and function in infants with posterior urethral valves.
- Preserving bladder function through EVA is crucial for long-term outcomes.
- Early primary ablation is recommended over upper tract diversion for managing posterior urethral valves.
Abstract:
Early diagnosis and the use of new pediatric endoscopic equipment have significantly improved the survival of infant boys with posterior urethral valves. The sequelae of urethral obstruction in these patients includes abnormalities in the urethra, bladder, ureters, and kidneys. The question remains of how best to treat all valve patients to maximize function of the entire urinary tract. Our experience with early valve ablation (EVA) suggests that the damaged bladder and upper tracts have a potential to heal if the obstruction is removed and the bladder is allowed to fill and empty cyclically in the first few months of life. One year after EVA, even patients with severe obstructive changes show return of normal bladder capacity and compliance, and resolution or improvement in reflux. Unfortunately, the renal insufficiency associated with valves often is secondary to primary renal dysplasia, with many patients progressing to renal failure and transplantation. Upper tract diversion has failed to improve long-term outcome in patients with renal dysplasia; furthermore, it jeopardizes the potential for bladder healing and normal bladder function. Therefore, even for patients with renal insufficiency, early primary ablation should be used as the definitive treatment for posterior urethral valves.