Trajectories and Predictors of Allograft Dysfunction after Renal Transplantation in Children

Area of Science:

• Pediatric Nephrology
• Transplant Immunology
• Organ Transplantation

Background:

• Pediatric renal transplant survival rates are improving, but maintaining optimal long-term renal function is crucial for growth.
• Key factors for sustained allograft function include nephron count and graft adaptability to growth-related demands.
• Understanding long-term glomerular filtration rate changes and age-related predictors is vital for pediatric kidney transplant outcomes.

Purpose of the Study:

• To examine long-term changes in glomerular filtration rate (GFR) in pediatric kidney transplant recipients.
• To assess the impact of recipient and donor ages on predicting kidney transplant outcomes.
• To identify trajectories of renal allograft function post-pediatric kidney transplantation.

Main Methods:

• Analysis of data from 67 pediatric renal transplant recipients with 278 inulin-clearance measurements (2000-2010).
• Utilized a longitudinal latent class model to identify distinct renal function trajectories.
• Classified children based on identified renal function patterns.

Main Results:

• Identified three renal allograft function trajectories: 'low and decreasing', 'moderate and stable', and 'high and sharply decreasing'.
• Grafts from living donors were associated with a significantly lower probability of the 'low and decreasing' function trajectory (adjusted OR 0.02; p = 0.03).
• Increased recipient age and donor-recipient age difference correlated with a higher probability of poorer graft function (p=0.07 for both).

Conclusions:

• Living donor kidney transplantation is a favorable factor for long-term allograft function in children.
• Younger donor age is associated with better outcomes in pediatric kidney transplants.
• Recipient age and donor-recipient age difference are important predictors of long-term transplant success.