Setting the speed limit: a pilot study of the rate of serum creatinine decrease after endoscopic valve ablation in...

Area of Science:

• Pediatric Nephrology
• Neonatal Surgery
• Urology

Background:

• Posterior urethral valve (PUV) is a common cause of bladder outlet obstruction in male neonates.
• Elevated serum creatinine in neonates with PUV indicates renal dysfunction.
• Urinary diversion is considered if serum creatinine remains high post-obstruction relief, but optimal recovery rates are undefined.

Purpose of the Study:

• To define the optimal rate of serum creatinine decrease in neonates following posterior urethral valve ablation.
• To establish a prediction curve for serum creatinine decline to assess treatment efficacy.

Main Methods:

• Retrospective review of 15 neonates treated for posterior urethral valve between 2002-2007.
• Exclusion of 11 patients with delayed diagnosis.
• Analysis of serial serum creatinine levels to determine the rate of decrease and time to nadir post-valve ablation.

Main Results:

• Serum creatinine nadir was reached around 6 months of age.
• 73% of total creatinine decrease occurred within the first 2 months post-ablation (45% reduction from peak).
• The rate of creatinine decrease was not influenced by initial peak values; outliers included neonates with normal peak creatinine or complications.

Conclusions:

• The rate of serum creatinine decline in early infancy provides valuable insight into the effectiveness of posterior urethral valve ablation.
• Monitoring creatinine decrease can help assess the adequacy of surgical intervention and guide further management.