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J Thorac Cardiovasc Surg 2007;133:525-531
© 2007 The American Association for Thoracic Surgery
Cardiothoracic Transplantation |
Toronto Lung Transplant Program, Toronto General Hospital, University of Toronto, Toronto, Canada.
Read at the Eighty-sixth Annual Meeting of The American Association for Thoracic Surgery, Philadelphia, Pa, April 29-May 3, 2006.
Received for publication April 29, 2006; revisions received August 16, 2006; accepted for publication September 5, 2006. * Reprint requests: Marc de Perrot, MD, MSc, Toronto General Hospital, 9N-961, 200 Elizabeth St, Toronto, Ontario, Canada M5G 2C4. (Email: marc.deperrot{at}uhn.on.ca).
| Abstract |
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METHODS: From May 1994 to May 2005, 467 lung transplants were performed at our institution. A total of 60 recipients received lungs from donors aged 60 years or more (range 6077 years, median 65 years), whereas 407 recipients received lungs from younger donors (range 959, median 39 years).
RESULTS: A total of 48 patients (10%) died within 30 days of surgery: 10 (17%) in the older donor group versus 38 (9%) in the younger donor group (P = .08). The operative mortality varied with the underlying lung disease and was higher in recipients presenting with pulmonary hypertension and pulmonary fibrosis than with emphysema or cystic fibrosis. A total of 210 patients died after a median follow-up of 25 months (range 0136 months). The overall 5- and 10-year survivals were 57% and 38%, respectively. However, the 10-year survival tended to be worse in the older donor group (16% vs 39% in the younger donor group, P = .07). Bronchiolitis obliterans syndrome was the predominant cause of death in recipients of older donors who survived for more than 90 days after surgery (11/17, 65% vs 45/132, 34% in recipients of younger donors surviving for >90 days after surgery, P = .01).
CONCLUSIONS: Given the lack of organ donors, lungs from donors aged 60 years or more should be considered for transplantation. However, the use of donors aged 60 years or more is associated with a lower 10-year survival, and bronchiolitis obliterans syndrome plays a significant role as the cause of late death.
| Introduction |
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A number of strategies have been advocated to increase the number of donors. Some centers have developed a living-related lung donor program, whereas others have focused on nonheart beating donors to ultimately palliate the lack of donors. Although living-related donors have been used successfully3
and nonheart beating donors have been shown to be feasible in humans,4
these strategies have remained limited to a small number of patients because of technical, medical, and ethical considerations.
The persistent shortage of lung donors has led to increasing interest in reevaluating the existing lung donor pool. Over the years, improvement in donor management and refinement in techniques of lung preservation have allowed expansion of some of the donor selection criteria without significant impact on the early morbidity and mortality after lung transplantation.5-8
However, despite the increasing use of marginal or extended donor lungs, extension of the selection criteria to donors aged 60 years or more is still considered as a contraindication for lung transplantation by the large majority of centers, and many lung donors are currently refused on the basis of age only. During the last several years, we have adopted a policy to not disqualify donors solely on the basis of age but to consider the lungs for transplantation if they fulfill other selection criteria. In this report, we analyzed the results from a series of 60 consecutive donors aged 60 years or more who were used for lung transplantation at our institution. The early and late outcomes were then compared with the group of recipients with transplants from donors aged less than 60 years at our institution during the same period.
| Materials and Methods |
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Donor management has been reviewed in detail elsewhere.9
Briefly, all donors received intravenous methylprednisolone (15 mg/kg; Solu-Medrol, Upjohn, Don Mills, Ontario, Canada) after brain death declaration. Donors were maintained euvolemic to avoid excess fluid administration, and vasopressin was often used to maintain adequate blood pressure. The use of Euro-Collins (Fresenius, Lexington, Mass) was switched to low-potassium dextran solution (Perfadex; Vitrolife, Goteborg, Sweden) for lung preservation in April 1998. Only truly purulent secretions in distal airways were considered as abnormal on bronchoscopy. Chest radiography was considered abnormal in the presence of pulmonary contusion or infiltrates. The last PAO
2 was measured in the operating room after donor resuscitation and management by the retrieval team.
Surgical procedure, immunosuppression, and antibiotic prophylaxis have also been reviewed in detail elsewhere.10
Recipients were chosen by the transplant surgeon, on the basis of blood type, size match, recipient status, time on the waiting list, and recipient age. Single lung transplant was usually performed through a posterolateral thoracotomy. Bilateral lung transplant and heartlung transplant were performed through a clamshell incision.
Data are expressed as means ± standard deviation or as median and range. The Student t test was used to test differences between continuous variables, and the chi-square test was used for categoric variables. Multivariate analysis was performed by logistic regression analysis. Survival was calculated with the KaplanMeier method, and survival curves were compared using the logrank test. Statview V (Abacus Concept, Berkeley, Calif) was used for all analyses.
| Results |
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The 30-day mortality varied with the underlying lung disease and was significantly higher in recipients presenting with pulmonary fibrosis and pulmonary hypertension than in recipients presenting with cystic fibrosis or emphysema (Table 3). In recipients presenting with cystic fibrosis, the death rate was 8% in the older and younger donor groups, and in recipients presenting with emphysema, the death rate was 0% in the older donor group and 7% in the younger donor group. In contrast, in the high-risk recipient group, the age of the donor seemed to be a significant risk factor. For pulmonary hypertension, both recipients of older donors died within 30 days of surgery, whereas in patients with pulmonary fibrosis, the 30-day mortality was 29% in the older donor group and 12% in the younger donor group.
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60 years, P = .3), or type of transplant (single vs bilateral, P = .7). The long-term survival was not significantly different between patients who underwent transplantation for emphysema (38% at 10 years), cystic fibrosis (34% at 10 years), pulmonary fibrosis (38% at 10 years), or pulmonary hypertension (55% at 10 years) (P = .4).
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| Discussion |
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During the last few years, we have taken the policy to consider all donors for lung transplantation and to avoid disqualifying donors on the basis of age only. This study was performed to review our experience with the first 60 consecutive donors aged 60 years or more whom we have used for lung transplantation in our program. Most of the older donors were nonsmokers, were intubated for less than 2 days, and presented with normal bronchoscopy and normal chest radiography. However, with increasing experience, we have become less restrictive and occasionally accepted older donors with a history of smoking, abnormal chest radiography, or a PAO 2 less than 300 mm Hg.
To evaluate the impact of older donors on early and late outcome after lung transplantation, we have used for comparison the group of 407 consecutive recipients receiving lungs from donors aged less than 60 years during the same time period at our institution. When comparing the 2 groups, we observed that the 30-day postoperative mortality was increased when older donors were used in recipients who underwent transplantation for pulmonary fibrosis and pulmonary hypertension. In contrast, only 1 patient who underwent transplantation for cystic fibrosis and no patient who underwent transplantation for emphysema died within 30 days of transplant in the older donor group. Thus, these findings suggest that older donors can be safely used in low-risk recipients. In high-risk recipients (eg, those with pulmonary hypertension or pulmonary fibrosis), however, the use of older donors should be carefully evaluated.
Evaluation of the operative risk should be determined by the quality of the donor, length of ischemic time, and recipient risk factors.11-13
An analysis from the United Network for Organ Sharing database showed that the interaction of older donor age and prolonged ischemic time was associated with increasing mortality at 1 month and at 1 year after lung transplantation.14
Although this study had only 23 donors aged more than 55 years, it is interesting to see that the postoperative mortality rate exponentially increased in donors aged more than 55 years when the ischemic time was more than 7 to 8 hours. In our experience, the total ischemic time for the second lung was less than 8 hours in all but 4 recipients with donors aged 60 years or more. It must be noted, however, that lung preservation has improved over the years and that the ischemic time seems to have less importance because the use of Euro-Collins was switched to Perfadex.9
The long-term outcome after lung transplantation can be influenced by donor lung characteristics. Ciccone and colleagues15
showed that recipients of donors with traumatic brain death experienced more severe rejection episodes during the first year posttransplantation and were predisposed to earlier development of BOS. In our experience, recipients of donors aged 60 years or more had lower 5- and 10-year survivals than recipients of younger donors. In addition, the cause of death was predominantly BOS in the older donor group, whereas it was predominantly sepsis in the younger donor group. Lower survival at 5 years after transplantation has also been observed in kidney and liver recipients who received their organs from donors aged more than 60 years.16,17
Thus, considering the total burden of injury that the transplanted organ is expected to endure, not unexpectedly, the use of older donors is associated with lower long-term survival. However, given the current lack of organ donors, lungs transplanted from donors aged 60 years or more can save the lives of many patients who would otherwise be at risk of dying of end-stage lung disease while on the waiting list.
The proportion of cadaveric donors aged 60 years or more has been progressively increasing over the past decade and now exceeds 10% of all cadaveric donors available for transplantation.18,19
In Canada, the rate of cadaveric donors aged 60 years or more has increased from 6% in 1992 to 15% or more in 1998 and thereafter.19
Thus, liberalization of the age as criteria for lung donation could significantly expand the number of organs available. In our experience, the proportion of donors aged 60 years or more has varied between 15% and 20% of all lung transplantations performed since 2001 at our institution. These organs have been mainly allocated to older recipients and the most ill patients on the waiting list.
| Conclusions |
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| References |
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