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Heterotopic Renal Autotransplantation in a Porcine Model: A Step-by-Step Protocol
Published on: February 21, 2016
Kidney paired donation and optimizing the use of live donor organs
Dorry L Segev1, Sommer E Gentry, Daniel S Warren
1Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Md.
Insights
An optimized national kidney paired donation (KPD) program significantly increases kidney transplants and graft survival rates. This advanced matching scheme improves HLA compatibility and reduces patient travel, offering more equitable access to life-saving transplants.
Area of Science:
- Nephrology and Transplant Surgery
- Immunogenetics and Histocompatibility
- Health Services Research and Policy
Background:
- Blood type and crossmatch incompatibility exclude over one-third of patients from live donor kidney transplantation.
- Kidney paired donation (KPD) facilitates transplants for incompatible donor-recipient pairs but has limited success.
- Current KPD matching schemes are insufficient to maximize transplant opportunities.
Purpose of the Study:
- To evaluate the impact of enhanced matching algorithms on KPD transplant outcomes.
- To compare optimized matching schemes against current KPD practices.
- To assess the potential for increased transplant numbers and quality.
Main Methods:
- Development of a simulation model for incompatible donor/recipient pairs.
- Design and implementation of a mathematically optimized matching algorithm.
- Comparison of the optimized algorithm with existing first-accept schemes using simulated patient data.
Main Results:
- A national optimized matching algorithm increased transplants (47.7% vs 42.0%) and 5-year graft survival (34.9% vs 28.7%).
- Optimized matching significantly improved HLA concordance (3.0 vs 4.5 mismatched antigens) and reduced patient travel (2.9% vs 18.4%).
- Highly sensitized patients saw a six-fold increase in successful matches (14.1% vs 2.3%) with the optimized national scheme.
Conclusions:
- Combining a national KPD program with an optimized matching algorithm maximizes compatible kidney transplants.
- Optimized matching provides greater flexibility in donor-recipient matching priorities and ensures equitable distribution of high-quality organs.
- Implementation of an optimized national KPD program could lead to substantial healthcare cost savings.
Context:
Blood type and crossmatch incompatibility will exclude at least one third of patients in need from receiving a live donor kidney transplant. Kidney paired donation (KPD) offers incompatible donor/recipient pairs the opportunity to match for compatible transplants. Despite its increasing popularity, very few transplants have resulted from KPD.
Objective:
To determine the potential impact of improved matching schemes on the number and quality of transplants achievable with KPD.
Design, Setting, And Population:
We developed a model that simulates pools of incompatible donor/recipient pairs. We designed a mathematically verifiable optimized matching algorithm and compared it with the scheme currently used in some centers and regions. Simulated patients from the general community with characteristics drawn from distributions describing end-stage renal disease patients eligible for renal transplantation and their willing and eligible live donors.
Main Outcome Measures:
Number of kidneys matched, HLA mismatch of matched kidneys, and number of grafts surviving 5 years after transplantation.
Results:
A national optimized matching algorithm would result in more transplants (47.7% vs 42.0%, P<.001), better HLA concordance (3.0 vs 4.5 mismatched antigens; P<.001), more grafts surviving at 5 years (34.9% vs 28.7%; P<.001), and a reduction in the number of pairs required to travel (2.9% vs 18.4%; P<.001) when compared with an extension of the currently used first-accept scheme to a national level. Furthermore, highly sensitized patients would benefit 6-fold from a national optimized scheme (2.3% vs 14.1% successfully matched; P<.001). Even if only 7% of patients awaiting kidney transplantation participated in an optimized national KPD program, the health care system could save as much as $750 million.
Conclusions:
The combination of a national KPD program and a mathematically optimized matching algorithm yields more matches with lower HLA disparity. Optimized matching affords patients the flexibility of customizing their matching priorities and the security of knowing that the greatest number of high-quality matches will be found and distributed equitably.
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