Non-heart-beating organ donors - A potential source of islets for transplantation

Background. The shortage of organ donors relative to the number of patients on transplant waiting Lists has led to a renewed interest in the use of non-heartbeating (NHB) organ donors in many centers. The lack of donors is also a problem for islet transplantation. The disparity between donor organs and potential recipients is further exacerbated by the requirement to transplant a large number of islets to increase the chance of success and the high level of variability in islet isolation yield. Non-heart-beating (NHB) donors have not previously been assessed as a source of islets for transplantation, and it is unknown what affects the additional factor of warm ischemic injury associated with NHB organs may have on the success of islet isolation. Methods. This study assesses the yield and function of islets from NHB donors and compares the results with islets obtained from heart-beating brain-dead (HB) donors. Results. There were no differences in the yield of islets per gram of pancreas, 1788 (0-4620) NAB vs. 1580 (26-2544) HE (median, range). The secretory function was also similar in both groups, with stimulation indices of 0.71-3.49 for NHB vs. 0.30-3.57 for HE (overall range). There was no correlation between islet yield and warm ischemia time in the NHB donor group. Conclusions. In conclusion, the study has demonstrated that it is possible to isolate large numbers of islets from NHB donor pancreata and that, where NHB donor programs exist, these could provide a significant addition to the number of potentially transplantable islets.