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Published on: October 12, 2017
Posterior urethral valves: renal failure and prenatal treatment
Daniel P Casella1, Jeffrey J Tomaszewski, Michael C Ost
1Department of Urology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA.
Insights
Posterior urethral valves are common but lead to poor outcomes, with over 50% developing kidney failure. Early detection and intervention before irreversible renal damage are crucial for improving survival and long-term health.
Area of Science:
- Pediatric Urology
- Nephrology
- Medical Diagnostics
Background:
- Posterior urethral valves (PUV) affect 1 in 5000 live births, leading to significant morbidity.
- Survivors often progress to end-stage renal disease (ESRD) within 10 years due to delayed intervention.
- Current diagnostic methods lack early predictive markers for obstruction.
Purpose of the Study:
- To highlight the limitations of current posterior urethral valves screening protocols.
- To emphasize the need for early detection and intervention strategies.
- To advocate for the development of new biologic markers and improved diagnostic tools.
Main Methods:
- Review of current diagnostic standards for posterior urethral valves, including voiding cystourethrography and ultrasonography.
- Analysis of the impact of delayed intervention on patient outcomes.
- Discussion of the potential of novel biomarkers and advanced instrumentation.
Main Results:
- Voiding cystourethrography is the gold standard for postnatal diagnosis, while ultrasonography aids prenatal detection.
- Existing screening protocols often result in interventions after irreversible renal damage has occurred.
- There is a lack of reliable markers for predicting obstruction pre-radiographically.
Conclusions:
- Improved outcomes for posterior urethral valves and congenital bladder outlet obstruction necessitate intervention before irreversible renal damage.
- Development of new biologic markers and enhanced instrumentation is critical for earlier diagnosis and treatment.
- Earlier fetal intervention holds the key to reducing mortality and long-term morbidity.
Abstract:
Posterior urethral valves occur in 1 : 5000 live births. Despite the high prevalence, the few children that survive do poorly, with over 50% progressing to ESRD in 10 years. The gold standard for post-natal diagnosis is voiding cystourethrography, while pre-natal diagnosis is dependent on routine screening ultrasonography. Despite the ability to identify features of bladder outlet obstruction early in fetal development, there is no consensus on how to incorporate early detection into current screening protocols. There has yet to be a marker that allows prediction of obstruction in the absence of or prior to radiographic evidence of obstruction. With our current screening strategy, the majority of interventions are performed well after irreversible damage has occurred. Improved mortality and long term morbidity from posterior urethral valves and congenital bladder outlet obstruction will likely remain unchanged until it is possible to intervene prior to the onset of irreversible renal damage. New biologic markers and improved instrumentation will allow for more effective diagnosis and intervention at earlier stages of fetal development.
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