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Share 35 changes in center-level liver acceptance practices.

Share 35 was implemented to provide improved access to organs for patients with Model for End-Stage Liver Disease (MELD) scores ≥ 35. However, little is known about the impact of Share 35 on organ offer acceptance rates. We evaluated all liver offers to adult patients who were ultimately transplanted between January 1, 2011 and December 31, 2015. The analyses focused on patients ranked in the top 5 positions of a given match run and used multilevel mixed-effects models, clustering on individual wait-list candidate and transplant center. There was a significant interaction between Share 35 era and MELD category (P < 0.001). Comparing offers to MELD score ≥ 35 patients, offers after Share 35 were 36% less likely to be accepted compared with offers to MELD score ≥ 35 patients before Share 35 (adjusted odds ratio, 0.64). There was no clinically meaningful difference in the donor risk index of livers that were declined for patients with an allocation MELD score ≥35 in the pre- versus post-Share 35 era. Organ offer acceptance rates for patients with an allocation MELD ≥ 35 decreased in every region after Share 35; the magnitude of these changes was bigger in regions 2, 3, 4, 5, 6, 7, and 11, compared with regions 8 and 9 that had regional sharing in place before Share 35. There were significant changes in organ offer acceptance rates at the center level before versus after Share 35, and these changes varied across centers (P < 0.001). In conclusion, in liver transplantation candidates achieving a MELD score ≥ 35, liver acceptance of offers declined significantly after implementation of Share 35. The alterations in behavior at the center level suggest that practice patterns changed as a direct result of Share 35. Changes in organ acceptance under even broader organ sharing (redistricting) would likely be even greater, posing major logistical and operational challenges, while potentially increasing discard rates, thus decreasing the total number of transplants nationally. Liver Transplantation 23 604-613 2017 AASLD.

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