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Ann Thorac Surg 1998;65:227-234
© 1998 The Society of Thoracic Surgeons
Departments of Surgery and Epidemiology and Biostatistics, the London Health Sciences Centre, the Robarts Research Institute and the University of Western Ontario, London, Ontario, Canada;
Departments of Surgery and Epidemiology and Biostatistics, the London Health Sciences Centre, the Robarts Research Institute and the University of Western Ontario, Harefield, England, United Kingdom;
Departments of Surgery and Epidemiology and Biostatistics, the London Health Sciences Centre, the Robarts Research Institute and the University of Western Ontario, Vienna, Austria;
Departments of Surgery and Epidemiology and Biostatistics, the London Health Sciences Centre, the Robarts Research Institute and the University of Western Ontario, Hannover and Homburg, Germany;
Departments of Surgery and Epidemiology and Biostatistics, the London Health Sciences Centre, the Robarts Research Institute and the University of Western Ontario, Paris, France;
Departments of Surgery and Epidemiology and Biostatistics, the London Health Sciences Centre, the Robarts Research Institute and the University of Western Ontario, Pittsburgh, Pennsylvania, USA;
Departments of Surgery and Epidemiology and Biostatistics, the London Health Sciences Centre, the Robarts Research Institute and the University of Western Ontario, St. Louis, Missouri, and 47 participating centers in the Pulmonary Retransplant Registry, USA
Accepted for publication September 25, 1997.
Dr Novick, Department of Surgery, London Health Sciences Centre, PO Box 5339, London, Ont, Canada N6A 5A5, (e-mail: rjnovick@julian.uwo.ca).
| Abstract |
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Methods. Two hundred thirty patients underwent retransplantation in 47 centers from 1985 to 1996. Logistic regression methods were used to determine variables associated with, and predictive of, survival and lung function after retransplantation.
Results. Kaplan-Meier survival was 47% ± 3%, 40% ± 3%, and 33% ± 4% at 1, 2, and 3 years, respectively. On multivariable analysis, the predictors of survival included ambulatory status or lack of ventilator support preoperatively (p = 0.005; odds ratio, 1.62; 95% confidence interval, 1.15 to 2.27), followed by retransplantation after 1991 (p = 0.048; odds ratio, 1.41; 95% confidence interval, 1.003 to 1.99). Ambulatory, nonventilated patients undergoing retransplantation after 1991 had a 1-year survival of 64% ± 5% versus 33% ± 4% for nonambulatory, ventilated recipients. Eighty-one percent, 70%, 62%, and 56% of survivors were free of bronchiolitis obliterans syndrome at 1, 2, 3, and 4 years after retransplantation, respectively. Factors associated with freedom from stage 3 (severe) bronchiolitis obliterans syndrome at 2 years after retransplantation included an interval between transplants greater than 2 years (p = 0.01), the lack of ventilatory support before retransplantation (p = 0.03), increasing retransplant experience within each center (fifth and higher retransplant patient, p = 0.04), and total center volume of five or more retransplant operations (p = 0.05).
Conclusions. Nonambulatory, ventilated patients should not be considered for retransplantation with the same priority as other candidates. The best intermediate-term functional results occurred in more experienced centers, in nonventilated patients, and in patients undergoing retransplantation more than 2 years after their first transplant. In view of the scarcity of lung donors, patient selection for retransplantation should remain strict and should be guided by the outcome data reviewed in this article.
| Introduction |
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| Patients and Methods |
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Variables Studied
Recipient variables included age, sex, original diagnosis before the first transplant procedure, indication for retransplantation, ambulatory status of the recipient before retransplantation, requirement for ventilator support, ABO blood group, cytomegalovirus (CMV) status, official waiting time for retransplantation, and interval between transplant procedures. An ambulatory recipient was defined as a patient who was able to walk at least 50 m, with or without assistance, immediately before retransplantation. In view of the close interaction between ambulatory status and the need for ventilator support before retransplantation, composite variables of "both ambulatory and not ventilator dependent" and "either ambulatory or not ventilator dependent" were also studied. Donor and operative variables included year of retransplantation, retransplant center, type of retransplant procedure, total center volume and individual center experience with retransplantation, donor ABO blood group, and CMV status.
Statistical Analysis of Survival
Data were incorporated into the pulmonary retransplant database with the use of the FoxPro database management system (Microsoft Corporation, Redmond, WA) on a Pentium/100 MHz computer. Statistical analysis was performed with the SAS statistical package, version 6.11 (SAS Institute Inc, Cary, NC). All data were expressed as mean ± standard error of the mean. Survival was calculated using the Kaplan-Meier method [15] and survival curves were contrasted using the log-rank test. Cox regression methods [16] were then used to determine which variables were associated with survival after retransplantation. Variables exhibiting a p value less than 0.10 on univariable analysis were considered for entry into a multivariable model to determine the independent predictors of survival after retransplantation. Furthermore, the odds ratio of each variable was expressed as a comparison of survival between groups, with a value of 1.0 indicating no survival difference, a value greater than 1.0 indicating increased survival, and a value less than 1.0 indicating decreased survival after retransplantation.
Because the data in this study were collected from 47 North American, European, and Australian centers, there was a possibility that these data might be clustered by center. We therefore adjusted for between-center effects, so that our analyses would more clearly show significant recipient, donor, and operative characteristics [14]. A variable for center was therefore created in which centers with five or more retransplantations were assigned unique levels, whereas centers with fewer than five retransplantations were grouped together as a single level. This variable for center, in addition to the recipient, donor, and operative characteristics, was included in the Cox regression analyses to adjust for possible between-center differences.
Statistical Analysis of Graft Function
A major focus of this study was postoperative graft function in the intermediate term and the recurrence of bronchiolitis obliterans syndrome (BOS) after retransplantation. Complete pulmonary function test data were therefore obtained prospectively from every survivor of retransplantation at 12-month intervals. Bronchiolitis obliterans syndrome stages were assigned according to previously published criteria on the basis of postoperative values of forced expiratory volume in one second (FEV1) [17]. The changes in absolute FEV1 values at 1, 2, and 3 years after retransplantation were calculated for the entire study cohort and for patients who underwent retransplantation because of obliterative bronchiolitis versus those who underwent retransplantation because of other conditions. Unpaired, two-tailed t tests were employed to compare FEV1 values between patient groups. In addition, logistic regression methods [16] were used to determine the factors associated with freedom from BOS (ie, BOS stage 0) and the absence of severe BOS (ie, BOS stage 3) 2 years after retransplantation. For all statistical analyses, a p value less than 0.05 was considered significant.
| Results |
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Survival
Of the 230 retransplant recipients, 146 have died and 84 are still living. Kaplan-Meier survival was 47% ± 3% at 1 year (versus 35% ± 5% 4 years ago), 40% ± 3% at 2 years, and 33% ± 4% at 3 years. The median follow-up in current survivors is 26 months (mean, 30.5 ± 2.2 months; range, 1 to 79 months). Ninety-five patients have reached the first anniversary, 59 the second anniversary, 37 the third anniversary, 21 the fourth anniversary, and 11 the fifth anniversary of retransplantation.
Association of Recipient, Donor, and Operative Variables With Survival
Variables that were significantly associated with survival on univariable analysis are shown in Table 1.
Survival was not significantly different according to the age, sex, original diagnosis, official waiting time, or CMV status of the recipient. The actuarial survival of patients undergoing retransplantation because of OB was significantly greater than in patients undergoing retransplantation because of other indications when a center-adjusted analysis was performed (Table 1), but not when the data were unadjusted for a possible center effect (Table 1; Fig 1).
These data are provocative, as patients surviving a retransplantation that was performed because of OB exhibited more pulmonary dysfunction postoperatively in a previous study from the registry than patients surviving a retransplantation performed because of acute graft failure or an intractable airway complication [14].
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Functional Status After Retransplantation
After a median follow-up of 26 months, 58% of patients were in New York Heart Association functional class I, 28% in class II, 11% in class III, and 3% in class IV. Seventy-seven of the 84 survivors did not require supplemental oxygen whereas 7 patients were oxygen-dependent.
Pulmonary Function and Bronchiolitis Obliterans Syndrome Stages in Retransplant Survivors
Complete, up-to-date FEV1 data were available from every retransplant patient who survived at least 1 year after operation. Fig 6
shows the prevalence of BOS stages in these patients at 1, 3, and 5 years after retransplantation. Eighty-one percent of patients were free of BOS (stages 1 to 3) at 1 year, 62% at 3 years, and 50% at 5 years. The prevalence of stage 3 (severe) BOS was 12% at 1 year, 24% at 3 years, and 27% at 5 years, which is similar to that reported after primary lung transplantation [6][9][18].
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| Comment |
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The practice of retransplantation has raised ethical dilemmas, which reflect the inalienable conflict between rights-based moral theories and utilitarianism [19][20][21]. Some authors have gone so far as to advocate an outright ban on retransplantation [19], whereas others believe that waiting lists should be altered so that primary transplant candidates have a better chance of receiving organs than retransplant candidates [20]. Our current study indicated that careful selection of pulmonary retransplant candidates can result in a 1-year survival that is nearly identical to that of primary lung transplant recipients (Table 3). Furthermore, this study demonstrated that BOS does not recur in a more accelerated manner after retransplantation than after first-time lung transplantation. The argument that pulmonary retransplantation should be banned because it invariably results in lower survival rates or worse graft function can therefore not be supported by the available evidence. We believe that lung retransplantation should be conducted only by programs that are accountable and willing to share their results with the international lung transplant community.
Compared with previous reports, there were several additional findings in this study that resulted from increased patient accrual to the retransplant registry and from the increased survival of previously registered patients. In addition, by adjusting for center effects, variability in our survival model was reduced, thus yielding higher odds ratios (and lower p values) for the other prognostic factors. Although a long interval between transplant procedures and the absence of ventilator support before retransplantation were not significant predictors of survival in our previous reports [13][14], they were significantly associated with survival in the current study. The interval between transplant procedures did not, however, enter the multivariable models predicting survival, probably because of the confounding effect of other variables such as ambulatory status and ventilator support. The group of patients with the strongest survival advantage on multivariable analysis were those who were either ambulatory or not on the ventilator before retransplantation and patients undergoing retransplantation after 1991 (Table 2). The interaction between ambulatory status and ventilator support was strong, and the favorable survival of patients who were not ambulatory but free of ventilator support was noteworthy (Fig 4). Interestingly, our initial hypothesis was only partially validated, in that the ambulatory status of retransplant candidates was not significantly associated with graft function in the intermediate term postoperatively. On the other hand, center experience with retransplantation, in concert with an interval between transplants of greater than 2 years and the lack of ventilatory support before retransplantation, was an important variable correlating with BOS stage postoperatively.
The possible limitations of studies involving multiinstitutional databases have been recently reviewed [22]. In summary, the caliber of all multiinstitutional studies is heavily dependent on the quality of the data and the completeness of follow-up. Furthermore, variables used in statistical analyses in multiinstitutional studies must be well defined a priori and the definition should not differ among contributing institutions. In this study, although the practice of primary and repeat lung transplantation differed among contributing programs, the data were of high quality, variables were clearly defined a priori, and follow-up was 100% complete. Nonetheless, the odds ratios depicted in Table 1Table 2 Table 4 were relatively low (1.5 to 2.5) and the 95% confidence intervals for some variables were relatively wide, indicating suboptimal precision despite the low p values. It is likely that more precise multivariable models predicting survival and graft function after pulmonary retransplantation could be obtained if additional relevant variables were analyzed. Data on the immunosuppressive protocol employed in each patient after retransplantation are therefore currently being entered prospectively into the pulmonary retransplant database. We anticipate that these additional data, further patient accrual to the retransplant registry, and an increasing duration of follow-up of retransplant recipients will increase our statistical power to determine the independent predictors of long-term survival and lung graft function after retransplantation. In the final analysis, however, predictive data from multivariable analyses must be validated prospectively before these models can be definitively relied upon to optimize clinical decision making in retransplant candidates [23].
In summary, although the early results of pulmonary retransplantation are improving, patient selection should remain strict because of the scarcity of lung donors. Nonambulatory, ventilated patients should not be considered for retransplantation with the same priority as other candidates. The strongest predictors of survival were ambulatory status or lack of ventilator support preoperatively, followed by retransplantation after 1991. The most favorable intermediate-term functional results occurred in more experienced centers, in nonventilated patients, and in patients undergoing retransplantation more than 2 years after their first transplant. Data on immunosuppression protocols after retransplantation are being prospectively entered into the pulmonary retransplant database to determine the ability of these agents to prevent progressive graft dysfunction after pulmonary retransplantation.
| Acknowledgments |
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| Footnotes |
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| Appendix 1 |
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Canada
Europe
United States
| References |
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