Increasing bladder capacity and vesicoureteral reflux in pediatric kidney transplant patients

Area of Science:

• Pediatric Nephrology
• Urology
• Transplantation Medicine

Background:

• Vesicoureteral reflux (VUR) is a condition where urine flows backward from the bladder to the kidneys.
• Kidney transplantation in children aims to restore renal function but can be complicated by urinary tract issues.
• Understanding factors influencing post-transplant VUR is crucial for optimizing outcomes in pediatric recipients.

Purpose of the Study:

• To determine the incidence of VUR after kidney transplantation in children.
• To examine the association between pre-transplant bladder capacity and post-transplant VUR.
• To evaluate the impact of pre-transplant VUR and surgical technique on post-transplant VUR.

Main Methods:

• A cohort of 172 pediatric kidney transplant recipients underwent voiding cystourethrography before and 4 months post-transplantation.
• Bladder capacity was assessed, with atrophic bladder defined by specific volume criteria.
• Correlation analysis explored relationships between post-transplant VUR and pre-transplant factors, including bladder capacity, native kidney VUR, and ureteral reimplantation method.

Main Results:

• Vesicoureteral reflux was detected in 7% of pediatric kidney transplant recipients post-transplantation.
• Pre-transplant atrophic bladder was identified as an independent risk factor for developing post-transplant VUR (HR 9.5, P=0.004).
• Bladder capacity significantly increased post-transplantation in both VUR-positive and VUR-negative groups.

Conclusions:

• Pre-transplant atrophic bladder is a significant risk factor for post-transplant VUR in pediatric kidney transplant recipients.
• Kidney function remains stable in patients with post-transplant VUR, suggesting good graft tolerance.
• Improved bladder capacity post-transplantation is a positive finding, potentially mitigating some urinary tract complications.