Table 5.
Comparison of strategies to extend deceased donor chains
| KPD only |
KPD + DD |
KPD + DD minus KPD only |
|||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
| Method name (see Figure 2) | KPD cand tx | Living donor to WLa | KPD cand tx | Living donor to WLa | DD-CIK | Blood type O DD-CIK | Blood type O living donor to WL | Extra total txb | Extra blood type O txb |
| S1: in + out | 659 (12.60) | 63 (2.10) | 1202 (12.96) | 776 (8.94) | 719 (9.77) | 588 (8.28) | 142 (2.25) | 536 (8.16) | 52 (3.37) |
| S2: in + 1 + out | 659 (12.58) | 63 (2.09) | 1237 (13.60) | 695 (7.75) | 635 (9.28) | 546 (9.41) | 100 (2.23) | 574 (8.95) | 68 (3.16) |
| S3: in + 1 + chain (30) | 659 (12.59) | 63 (2.09) | 1254 (13.21) | 605 (6.69) | 554 (8.18) | 481 (8.20) | 28 (0.59) | 582 (8.16) | 71 (3.10) |
| S4: in + 1 + chain (90) | 659 (12.59) | 63 (2.09) | 1261 (13.16) | 570 (6.95) | 538 (8.14) | 471 (8.10) | 18 (0.63) | 571 (8.70) | 71 (3.05) |
| S5: S4 + blood type O end | 659 (12.59) | 63 (2.09) | 1227 (13.26) | 744 (7.95) | 695 (9.00) | 626 (9.38) | 193 (2.74) | 554 (8.20) | 59 (3.24) |
| S6: S1 + blood type match | 659 (12.59) | 63 (2.09) | 732 (11.78) | 248 (6.04) | 185 (4.23) | 116 (2.48) | 134 (2.67) | 73 (4.18) | 66 (2.55) |
| S6: S2 + blood type match | 659 (12.59) | 63 (2.09) | 754 (11.65) | 255 (5.72) | 192 (3.97) | 128 (2.27) | 133 (2.21) | 94 (3.92) | 69 (2.47) |
DD, deceased donor; DD-CIK, deceased donor chain-initiating kidney; cand, candidates; KPD, kidney paired donation; KPDP, kidney paired donation program; Tx, transplant; WL, waitlist.
For each strategy indicated in the first column, the next 7 columns report results for “KPD only” and “KPD + DD” averaged over all other variables. The final two columns report the average numbers of extra transplants and extra blood type O transplants achieved in “KPD + DD” compared with “KPD only.”
These living donor transplants to the waitlist reflect donations by nondirected donors or bridge donors from the KPDP.
The extra total number of transplants in column 9 is obtained as fourth column plus fifth column minus sixth column minus second column minus third column. This follows because the total number of transplants in the KPD only method is the second column plus the third column plus the actual number of deceased donor transplants in 2016 to 2017. In the “KPD+DD” method, the total number of transplants is the fourth column plus the fifth column plus the actual number of deceased donor transplants in 2016 to 2017 minus the sixth column. Extra blood type O transplants are obtained in a similar way, although not all data required for this calculation are included in this table.