Related Experiment Videos
The impact of MELD on OPTN liver allocation: preliminary results
Erick B Edwards1, Ann M Harper
1United Network for Organ Sharing, Richmond, Virginia, USA.
Abstract:
The OPTN implemented a revised system (MELD/ PELD) for the allocation of cadaveric livers on February 27, 2002. When compared with an earlier era, preliminary results indicate that transplant rates remain similar by gender, ethnicity, age group (adult and pediatric) and for most principal diagnoses. Both the actual number of pretransplant deaths and the pretransplant death rate has dropped under the new system. While some regional variation exists in the average MELD scores at listing, death and transplant, it accounts for only a small percentage of the total variation observed. In a multivariate analysis, MELD scores above 20 had the strongest effect and were associated with a significantly increased mortality risk on the waiting list. More data are need to analyze the impact of MELD on posttransplant outcomes.
Insights
The revised liver transplant system (MELD/PELD) shows similar transplant rates but fewer pretransplant deaths. Higher MELD scores increase waiting list mortality risk.
Area of Science:
- Organ transplantation
- Medical policy evaluation
- Public health
Background:
- The Organ Procurement and Transplantation Network (OPTN) revised its liver allocation system in 2002.
- The revised system, known as Model for End-Stage Liver Disease (MELD) and Pediatric End-Stage Liver Disease (PELD), replaced the previous allocation criteria.
- This study evaluates the initial impact of the MELD/PELD system on liver transplant outcomes.
Purpose of the Study:
- To assess the effect of the MELD/PELD system on liver transplant rates across various demographic groups.
- To evaluate changes in pretransplant mortality before and after the implementation of the MELD/PELD system.
- To analyze the relationship between MELD scores and waiting list mortality.
Main Methods:
- Comparative analysis of transplant rates before and after February 27, 2002.
- Evaluation of pretransplant death numbers and rates.
- Multivariate analysis to determine the impact of MELD scores on mortality risk.
Main Results:
- Transplant rates remained consistent across gender, ethnicity, age groups, and principal diagnoses.
- A significant decrease in both the number and rate of pretransplant deaths was observed.
- Elevated MELD scores (above 20) were strongly associated with increased waiting list mortality.
Conclusions:
- The MELD/PELD system has successfully reduced pretransplant deaths without negatively impacting transplant rates.
- Regional variations in MELD scores at listing, death, and transplant are minimal.
- Further research is required to fully understand the long-term effects of MELD on posttransplant outcomes.