Temporal changes in the composition of a large multicenter kidney exchange clearinghouse: Do the hard-to-match accumulate?

Temporal changes in the composition of a large multicenter kidney exchange clearinghouse: Do the hard-to-match accumulate?
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DOI:
10.1111/ajt.15046
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发表时间:
2018-11
期刊:
American journal of transplantation : official journal of the American Society of Transplantation and the American Society of Transplant Surgeons
影响因子:
--
通讯作者:
Segev DL
Segev DL
中科院分区:
其他
文献类型:
--
作者:
Holscher CM;Jackson K;Thomas AG;Haugen CE;DiBrito SR;Covarrubias K;Gentry SE;Ronin M;Waterman AD;Massie AB;Garonzik Wang J;Segev DL

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对肾脏配对捐献(KPD)的一个批评是,容易匹配的候选人很快就离开了登记处,从而集中了难以匹配的致敏和O型血候选人。我们研究了从2012年1月至2016年6月在美国最大的KPD信息交换中心国家肾脏登记处注册的候选人/供体对。随着时间的推移,新登记的候选人的年龄、性别、BMI、种族、ABO或PRA没有变化,难以匹配的候选人的登记一致(59%的O型和38%的PRA≥97%)。然而,随着时间的推移,没有O型候选物的积累,可能是由于非定向O型供体的数量增加。尽管PRA≥97%的候选人最初积累了一定数量(从2012年的33%到2014年的43%,p=0.03),但到2016年6月,这一比例下降到17%(p<0.001)。部分原因是在实施肾脏分配系统后,PRA≥97%的候选人接受已故供体肾移植的比例增加,从2012年登记者的8%增加到2015年登记者的17%(p=0.02)。在这个大型的KPD信息交换中心,越来越多的非直接捐赠者和肾脏分配系统的参与减少了难以匹配的候选人的积累,但高度敏感的候选人仍然难以匹配。
One criticism of kidney paired donation (KPD) is that easy-to-match candidates leave the registry quickly, thus concentrating the pool with hard-to-match sensitized and blood type O candidates. We studied candidate/donor pairs who registered with the National Kidney Registry, the largest US KPD clearinghouse, from 1/2012–6/2016. There were no changes in age, gender, BMI, race, ABO, or PRA of newly registering candidates over time, with consistent registration of hard-to-match candidates (59% type O and 38% PRA≥97%). However, there was no accumulation of type O candidates over time, presumably due to increasing numbers of non-directed type O donors. Although there was an initial accumulation of candidates with PRA≥97% (from 33% of the pool in 2012 to 43% in 2014, p=0.03), the proportion decreased to 17% by June 2016 (p<0.001). Some of this is explained by an increase in the proportion of candidates with PRA≥97% who received a deceased donor kidney transplant after the implementation of the Kidney Allocation System, from 8% of 2012 registrants to 17% of 2015 registrants (p=0.02). In this large KPD clearinghouse, increasing participation of non-directed donors and the Kidney Allocation System have lessened the accumulation of hard-to-match candidates, but highly sensitized candidates remain hard-to-match.
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