Cautious approach to use of non-heart-beating donors

How to improve the quality of kidneys from non-heart-beating donors: a randomised controlled trial of thrombolysis in non-heart-beating donors

BACKGROUND

The growth in the prevalence of end-stage renal failure has been accompanied with a rise in the waiting list for renal transplantation, which has not been matched by an increase in the kidney donor pool. Non-heart-beating donors (NHBD) offer a potential source of kidneys that are not currently being significantly used. Cardiac arrest for a protracted period of time leads to in situ thrombosis, and, as a consequence, the discard rates for harvested kidneys is higher than brain-stem-dead donors.

METHODS

A double-blinded, randomised, controlled trial of streptokinase preflush or placebo for NHBD was performed. An initial 30 donors were entered into the study. After routine nephrectomy, NHBD kidneys were machine perfused as part of viability screening before transplantation. Kidneys were then transplanted within 24 hours of cardiac arrest. The primary objectives were the improvements of viability parameters (perfusion, enzyme levels, and histopathology) of the kidneys. The secondary objective was to increase the number of kidneys passing the viability tests and thus transplanted.

RESULTS

The two groups of NHBD donors and their kidneys were similar in their descriptive epidemiologic characteristics. The NHBD kidneys from the streptokinase-treated donors had a better appearance at procurement (P<0.001) and performed better during machine preservation (P<0.001). Enzyme biomarkers present in the kidney perfusate were all significantly reduced by the use of streptokinase. These included glutathione S-transferase (P<0.001), fatty acid binding protein (P<0.001), and alanine aminopeptidase (P<0.001). However, although there was a higher proportion of kidneys transplanted through the use of streptokinase (63.6% with streptokinase vs. 42.6% with placebo), this did not achieve significance. There was no difference with respect to postoperative bleeding and transfusion requirements in the recipient whether streptokinase preflush or placebo was used.

CONCLUSION

This study using streptokinase preflush in the NHBD was found to improve the condition of the kidneys retrieved. The improvement in the quality of the donor kidneys was not associated with an increased morbidity in the recipient.

Experiences learned in the successful establishment of a nonheart beating donor program for renal transplantation

PURPOSE

With the continuing shortage of suitable donors increasing interest is being shown in nonheart beating donation. Such a resource is a new and, therefore, an underused source of donor organs. However because of the nature of such donors, the kidneys so derived have been damaged by primary warm ischemia, and so potentially they may never function. We introduced viability testing to identify such organs and, thus, avoid transplantation. We reviewed sentinel cases in our developing program from which we have learned.

MATERIALS AND METHODS

Machine perfusion was developed locally and used to test the kidneys derived from such donors. Flow characteristics and enzyme analysis were used to define usable kidneys. The definitions of acceptable criteria evolved through the study during a 3-year period.

RESULTS

As previously defined, acceptable criteria were initially adhered with decreasing resistance and a glutathione S-transferase of less than 200 IU/l/100 gm. After the series described acceptable limits were changed in favor of a high perfusion flow index, low temperature, low weight increase and low glutathione S-transferase.

CONCLUSIONS

If such criteria are adhered to, graft survival becomes reliable from such donors.

Outcome of transplantation using kidneys from controlled (Maastricht category 3) non-heart-beating donors

BACKGROUND

Many renal transplant centres are reluctant to use kidneys from non-heart-beating (NHB) donors because of the high incidence of primary non-function and delayed graft function reported in the literature. Here, we report our favourable experience of using kidneys from Maastricht category 3 donors (controlled NHB donors).

MATERIALS AND METHODS

From January 1996 to June 2002, 42 renal transplants using kidneys from 25 controlled NHB donors were undertaken at our centre. The rates of primary non-function, delayed graft function (DGF), rejection and long-term graft and patient survival were compared with those of 84 recipients of grafts from heart-beating (HB donors) transplanted contemporaneously.

RESULTS

Primary non-function did not occur in recipients of grafts from NHB donors but was seen in two grafts from HB donors. DGF occurred in 21 of 42 (50%) kidneys from NHB donors and 14 of 84 (17%) kidneys from HBD donars (p < 0.001). The acute rejection rates in the two groups were similar (33% for grafts from NHB donors vs. 40% from HB donors). By 1 month after transplantation, there was no significant difference in serum creatinine concentration between the two groups. Over a median follow-up period of 32 months (range 2-75 months), the actuarial graft survival rates at 1, 3 and 5 yr after transplantation were 84, 80 and 74% for recipients of kidneys from NHB donors, compared with 89, 85 and 80% for kidneys from HB donors.

CONCLUSION

Controlled NHB donors are a valuable and under-used source of kidneys for renal transplantation. The outcome for recipients of kidney allografts from category 3 NHB donors is similar to that seen in recipients of grafts from conventional HB cadaveric donors.

Total recovery of heart grafts of non-heart-beating donors after 3 hours of hypothermic coronary oxygen persufflation preservation in an orthotopic pig transplantation model

BACKGROUND

The coronary oxygen persufflation (COP) technique has been previously shown to allow prolonged heart preservation of 14 hr with optimal recovery in a pig model of orthotopic transplantation. This technique may be applicable to hearts grafted from non-heart-beating donors (NHBD).

METHODS

Experiments were performed on pigs to test the effectiveness of oxygenated preservation, using COP for preservation of NHBD hearts. After 16 min of in situ normothermic ischemia, the hearts were flushed with histidine-tryptophan-ketoglutarate (HTK) solution or modified HTK solution (mBHTK) including 30 mmol/L 2,3-butanedione monoxime, 40 mg/L hyaluronidase,15 micromol/L adenosine, and 50 micromol/L calcium. Hearts were stored in the flush solutions for 3.3 hr or additionally persufflated with gaseous oxygen through the coronary arteries (COP) and transplanted orthotopically.

RESULTS

Simple storage in HTK did not allow recovery of these hearts, whereas mBHTK storage resulted in improved function with 1.1 L/min cardiac output. The cardiac output reached 2.8 L/min (68% of normal values) with a left ventricular developed pressure of 101 mm Hg only after mBHTK+COP. Then the hearts were able to guarantee the circulation of the recipient for the test period after weaning from the heart-lung machine.

CONCLUSIONS

Even in an NHBD with more than 15 min of in situ ischemia, the use of COP in combination with mBHTK solution for 3.3-hr storage of the heart allows excellent recovery of transplanted hearts and normal weaning from the heart-lung machine. This indicates that COP combined with mBHTK may be an optimal preservation technique for use with NHBD hearts.

Long-term results of renal transplantation using kidneys harvested from non-heartbeating donors: a 15-year experience

PURPOSE

To expand the pool of suitable organ donors we developed an organ procurement program of non-heartbeating donors during the last 15 years. We compare graft survival in patients receiving renal transplants procured from non-heartbeating with recipients of kidneys from heartbeating donors.

MATERIALS AND METHODS

From 1986 to 1999, 60 renal transplantations were performed with kidneys harvested from non-heartbeating donors (Mastrich category IV). Kidneys were procured using a double balloon triple lumen catheter inserted into the femoral artery. The 60 kidneys were selected from 70 non-heartbeating donors based on age younger than 50 years, warm ischemia less than 30 minutes, creatinine less than 200 micromol./l., and no hypertension or major histological lesions. Long-term results of graft survival and complications were compared with a series of 1,065 renal transplantations performed during the same period with kidneys procured from heartbeating donors.

RESULTS

Mean age of the recipients was statistically different as non-heartbeating donors were older. However, the 10-year graft survival rates were similar in both groups (50% versus 53%). Incidence of ureteral stenosis and fistula, arterial stenosis and thrombosis was not statistically different in both groups. On the other hand, delay graft function was more frequent in non-heartbeating donors (60% versus 40%, p = 0.01).

CONCLUSIONS

Despite a high rate of acute tubular necrosis, kidneys harvested from non-heartbeating donors had the same graft survival rates as those procured from heartbeating donors. Surgical complications were not different. Transplantation of selected kidneys procured from non-heartbeating donors should be promoted as a response to organ shortage.

Kidney transplantation from donors without a heartbeat

BACKGROUND

The dramatic shortage of kidney donors has triggered interest in other sources of organs, such as donors without a heartbeat. Accumulating evidence suggests that the short-term survival of cadaveric kidneys from such donors is similar to that of cadaveric kidneys from donors with a heartbeat. However, no data from large, matched studies with long-term follow-up are available. We conducted a matched, single-center study of kidney transplants obtained from donors without a heartbeat and those from donors with a heartbeat, with a 15-year follow-up period.

METHODS

Between 1985 and 2000, 122 kidney transplantations involving donors without a heartbeat were performed at the University of Zurich, in Switzerland. Outcomes of these procedures were compared with those of 122 transplantations of kidneys from donors with a heartbeat. The recipients were matched according to age, sex, number of transplantations, and calendar period of transplantation.

RESULTS

The characteristics of the recipients did not differ significantly between the two groups. We observed a significantly higher incidence of delayed graft function among the patients who received kidneys from donors without a heartbeat (48.4 percent) than among the patients who received kidneys from donors with a heartbeat (23.8 percent) (P<0.001). However, the long-term rate of graft survival was similar in the two groups (P=0.98): at 10 years, the rate of graft survival was 78.7 percent for kidneys from donors without a heartbeat and 76.7 percent for kidneys from donors with a heartbeat.

CONCLUSIONS

Although the incidence of delayed graft function is significantly higher with kidneys from donors without a heartbeat than with kidneys from donors with a heartbeat, there is no difference in long-term outcome between the two types of graft.