Waiting list outcome of Peld/Meld exceptions: A single-center experience in Argentina

Area of Science:

• Pediatric Hepatology
• Transplant Allocation Policy
• Clinical Outcomes Research

Background:

• Argentina implemented PELD/MELD-based liver transplant (LT) allocation in 2005.
• A system of exception points was established to address PELD/MELD score limitations for critically ill patients.
• The impact of these exceptions on pediatric waitlist (WL) outcomes required investigation.

Purpose of the Study:

• To evaluate the waitlist outcomes for pediatric patients granted PELD/MELD exceptions.
• To compare WL outcomes between children with PELD/MELD exceptions and those without exceptions but with high PELD/MELD scores.

Main Methods:

• Retrospective cohort study of children (<18 years) listed for LT in Argentina (July 2005–January 2014).
• Analysis of WL outcomes, including transplantation rates and mortality, for patients with and without PELD/MELD exceptions.
• Univariable analysis comparing exception patients to non-exception patients with PELD/MELD ≥19.

Main Results:

• Of 408 children listed for LT, 85 (30%) received PELD/MELD exceptions.
• Among exception patients, 89.4% were transplanted, and 7.1% died on the WL.
• Exception patients demonstrated significantly better WL access and lower WL mortality compared to non-exception patients with high PELD/MELD scores.

Conclusions:

• PELD/MELD exception points significantly improved waitlist outcomes for pediatric liver transplant candidates in Argentina.
• The exception system provided an advantage for children with severe conditions not fully reflected by standard PELD/MELD scores.
• These findings support the utility of exception points in optimizing liver transplant allocation for pediatric patients with chronic liver disease.