Does hydronephrosis after extravesical ureteral reimplantation deteriorate renal function?

Area of Science:

• Pediatric Urology
• Nephrology
• Surgical Outcomes

Background:

• Vesicoureteral reflux (VUR) is a common condition in children, often treated with ureteral reimplantation.
• Extravesical ureteral reimplantation is a surgical technique used to correct VUR.
• Postoperative hydronephrosis and its impact on differential renal function require further investigation.

Purpose of the Study:

• To determine if newly developed or aggravated hydronephrosis after extravesical ureteral reimplantation affects differential renal function.
• To identify risk factors for hydronephrosis and decreased differential renal function post-surgery.

Main Methods:

• Retrospective cohort analysis of 90 patients undergoing extravesical ureteral reimplantation for unilateral VUR.
• Ultrasonography and dimercaptosuccinic acid (DMSA) scans were performed preoperatively and postoperatively.
• Analysis of preoperative and perioperative parameters to assess factors influencing hydronephrosis and differential renal function.

Main Results:

• 28.4% of patients developed or had aggravated hydronephrosis 1 month post-surgery; younger age was a risk factor.
• 15.7% of patients experienced a decrease in differential renal function (>5%) 6 months post-surgery.
• Preoperative parenchymal reduction on DMSA scan was the only significant predictor of decreased differential renal function; no correlation was found between hydronephrosis and function decrease.

Conclusions:

• Newly developed or aggravated hydronephrosis post-extravesical ureteral reimplantation is common but transient and does not impact differential renal function.
• Preoperative parenchymal reduction is a key indicator for potential postoperative decrease in differential renal function.
• Careful monitoring and consideration of preoperative renal function are crucial for managing patients post-ureteral reimplantation.