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Division of Thoracic and Cardiovascular Surgery, Hannover Medical School, Carl-Neuberg-Strasse 1, 30625 Hannover, Germany
Received 6 April 2007; received in revised form 10 July 2007; accepted 24 August 2007.
* Corresponding author. Tel.: +49 511 532 2153; fax: +49 511 532 5404. (Email: goerler.adelheid{at}mh-hannover.de).
| Abstract |
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Key Words: Heart–lung transplantation Lung transplantation Grown-up congenital heart disease Eisenmenger's syndrome
| 1. Introduction |
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A significant proportion of GUCH patients develop irreversible pulmonary hypertension [5,6]. In those patients isolated cardiac transplantation cannot be performed with an acceptable risk and thus, heart–lung and lung transplantation with simultaneous repair of the cardiac defect become the only treatment options. We analysed our experience with heart–lung and lung transplantation in adults with end stage CHD and Eisenmenger's syndrome.
| 2. Patients and methods |
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2.2 Morbidity and mortality
Early death was defined as death before day 30. Underlying diagnoses, previous operations, associated procedures and survival have been documented. Long-term outcome was compared to the non-GUCH patients after heart–lung and bilateral lung transplantation.
2.3 Statistical analysis
Data were prospectively recorded and retrospectively analysed. Actuarial survival was estimated with the Kaplan–Meier method and analysed using the log-rank test. A two-sided p value of less than 0.05 was considered statistically significant. All data were analysed using the Statistical Program of Social Sciences (SPSS, version 13.0, SPSS, Inc., Chicago, Il).
| 3. Results |
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Twelve patients had undergone previous surgical procedures. In the DLTX group, one VSD closure and one PA banding had been performed. In the HLTX group, two patients had received diagnostic sternotomy without any surgical correction. Four had received modified BT-shunt (2 of them combined with other complex procedures). VSD closure (n = 1), repair of aortic coarctation (n = 1), Mustard operation (n = 1) and PA banding (n = 1) had been performed in the other patients. Indication for transplantation was a significant decline of cardiopulmonary function combined with pulmonary hypertension in all patients (Table 1).
3.3 Organ preservation and surgical procedures
For cardioplegia St. Thomas solution was used in 11 patients, University of Wisconsin (UW) solution in 18 patients and histidine–tryptophan–ketoglutarate (HTK) solution in 17 patients according to the era of transplantation. For preservation of the lungs Euro-Collins solution was used in 25 patients, whereas 26 organs were preserved with Perfadex solution. Mean ischaemic time was 255 ± 44 min in the heart–lung group and 322 ± 65 min in the bilateral lung group (for the second lung).
All but one heart–lung transplantations were performed via median sternotomy. In one patient transverse thoraco-sternotomy (clamshell incision) was performed because of severe adhesions. Tracheal anastomosis was performed in all heart–lung transplants. Venous anastomoses were accomplished using either the atrial or bicaval technique. Bilateral lung transplantations were performed via clamshell incision in all patients. During all procedures cardiopulmonary bypass was used.
3.4 Additional surgical procedures
Six patients required additional surgical procedures at the time of transplantation. In three patients of the DLTX group repair of cardiac defects has been performed simultaneously: tricuspid valve repair and PFO closure in one patient, VSD closure and de-banding of the pulmonary artery in the second patient and ASD closure in the third patient. In the HLTX group one patient received repair of aortic coarctation, one patient underwent additional renal transplantation and in one patient atypical lung resection was performed because of size mismatch (Table 1).
3.5 Immunosuppression and postoperative management
Postoperative immunosuppression consisted of an induction therapy with anti-thymocyte globulin (ATG) followed by a triple maintenance therapy based on cyclosporine or tacrolimus in combination with azathioprine or mycophenolate mofetil and steroids. All patients were followed up for life in our transplant outpatient department.
3.6 Re-transplantations
Two patients after heart–lung transplantation underwent redo-transplantation (DLTX) because of severe bronchiolitis obliterans syndrome (BOS III) with significantly impaired pulmonary graft function. These re-transplantations have been performed 5.7 and 7.7 years after the initial transplantation. Unfortunately, both patients died within the first 30 days after re-transplantation. One of them died because of severe infection and the other because of early graft failure (Table 2
). Two patients after HLTX are listed for redo lung transplantation because of severe bronchiolitis obliterans syndrome. Another patient suffers from BOS III but is not a candidate for re-transplantation because of severe co-morbidities. Redo heart–lung transplantation has not yet been performed.
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The actuarial survival rate was 80 ± 6% at 1 year, 69 ± 7% at 5 years and 53 ± 9% at 10 years. Compared to the overall mortality of the non-GUCH patients after lung and heart–lung transplantation at our institution there was no significant difference: 1 year survival was 76 ± 2%, 5 year survival was 60 ± 3% and 10 year survival was 45 ± 4% (Fig. 2 ).
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| 4. Discussion |
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According to the Guidelines for the Management of Grown-up Congenital Heart Disease, published in 2003, there are some important differences in the GUCH patients compared to other indications for cardiopulmonary transplantation [2]:
Timing of transplantation is difficult because risk stratification scores that are available for end-stage congestive heart failure may not apply to grown-up patients with congenital heart disease. This makes decisions regarding timing of transplantation difficult. Patients are well adapted to their limited working capacity and thus, often present very late to our transplantation units. Hosseinpour et al. [3] point out that survival of adult patients with Eisenmenger's syndrome is hard to predict. Therefore, deteriorating quality of life and increasing number of hospital admissions may indicate the optimal time for listing [3]. In this context waiting list mortality has to be considered. According to Smits et al. waiting list mortality for patients with Eisenmenger's syndrome on the elective heart–lung list is 17.6% per year within the Eurotransplant area. Compared to patients suffering from end-stage pulmonary hypertension and other end-stage diseases with a 1-year waiting list mortality of 44% and 33%, respectively, survival of the Eisenmenger patients is significantly better. Probability of transplantation is 41% per year in the Eisenmenger patients [8].
Another significant issue in this patient group is technical considerations. The surgical procedure may be complicated by multiple previous operations and complex anatomic variations. Especially in cyanotic cardiac malformations multiple pleuro-pulmonary collateral vessels may cause profuse bleeding [3,4]. Therefore, Pigula and co-workers advocate access by bilateral thoraco-sternotomy (clamshell incision) rather than sternotomy in order to facilitate haemostasis [6]. We also perform clamshell incisions in patients where severe bleeding from adhesions is anticipated. In addition, complex anatomic variations may preclude implantation of the organ by the conventional technical approach. Technical adjustments, including cannulation techniques, may become necessary [3].
Among our patients, only 24% had undergone previous cardiac surgery, two of them received merely explorative sternotomies without any further surgical intervention. This is due to the fact that 34 years ago, which is the mean age of our study group, paediatric cardiac surgery was still an evolving field. Today, there are only few cardiac defects that are not eligible for early surgical repair or palliation [1,5]. As a consequence, the development of severe and irreversible elevation of pulmonary vascular resistance can be prevented in the majority of patients and thus, isolated cardiac transplantation can be performed, if necessary. On the other hand, previous surgical interventions increase the operative risk. Severe bleeding may occur during re-entry to the chest and anatomic variations may require additional reconstructive surgery. Thus, longer operation and bypass times may lead to prolonged organ ischaemia and impaired postoperative organ function [5]. As Hosseinpour et al. emphasise, a close communication between the donor and the recipient surgical team is essential, because the donor team must allow time for the recipient team to prepare for the implantation of the donor organ. In particular, meticulous haemostasis must be achieved before implantation [3].
At our institution thoracic computed tomography is routinely performed in all patients presenting for lung and heart–lung transplantation. Multidetector computed tomography has now been widely accepted as an appropriate non-invasive diagnostic tool for preoperative assessment of complex cardiac anatomy in re-operative heart surgery [9–11]. Three-dimensional reconstructions are particularly helpful in patients after operative correction of congenital heart disease, because they provide a clear visualisation of cardiac anatomy which is easily understandable not only for specialised paediatric cardiac surgeons. A clear definition of the anatomy is crucial for the surgical strategy. Moreover, the proximity of the heart and vessels to the sternum and chest wall can be estimated. Thus, cannulation of the femoral vessels may be indicated. Finally, the existence of pleuro-pulmonary collaterals can be assessed. Because of our experience with fatal bleeding from such collaterals (patient no. 2, Table 2), we consider the existence of extensive pleuro-pulmonary collaterals a contraindication for heart–lung transplantation. Fig. 3 shows a CT scan of a patient with pulmonary atresia and multiple aorto-pulmonary collateral arteries (MAPCAS) who presented for heart–lung transplantation because of progressive cardiopulmonary failure and Eisenmenger reaction. Unfortunately, this patient had developed multiple pleuro-pulmonary collaterals and has therefore not been accepted as a candidate for heart–lung transplantation at our institution (Fig. 3).
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Another crucial issue in this young patient population is long-term survival after cardiopulmonary transplantation. Chronic rejection and infection still remain major causes of death despite improved immunosuppressants and antibiotics. Redo lung transplantation after heart–lung transplantation is technically feasible, but was not successful in both patients in this study. They died within 30 days after re-transplantation, one because of severe infection and the other one because of early graft failure (Table 2). Ten-year survival of patients with congenital heart disease after cardiopulmonary transplantation was 53% in our patients and 37% according to the ISHLT registry report [13]. Compared to the overall mortality of the non-GUCH patients after lung and heart–lung transplantation at our institution there was no significant difference [14,15]. Therefore, we consider cardiopulmonary transplantation a reasonable therapeutic option for this patient group despite the above-mentioned difficulties. Detailed knowledge about anatomical variations, exclusion of multiple pleuro-pulmonary collaterals and careful planning of the operation may reduce the operative risk in these patients. However, considering the young age of this patient group and the significant shortage of donor organs, transplantation should always be considered as the final therapeutic option in patients with congenital heart disease. Early diagnosis of cardiac defects and adequate surgical or interventional treatment remain the most effective strategies to avoid cardiopulmonary transplantation or postpone it as long as possible.
| 5. Conclusion |
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| Appendix A |
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Dr W. Weder (Zurich, Switzerland): You had six patients who underwent bilateral lung transplantation. Could you tell us the indications? Were these all patients in whom a defect of the heart was corrected?
Dr Goerler: The underlying diseases of these patients were ventricular or atrial septal defects that have been corrected before transplantation in three patients, but too late, that they already developed pulmonary hypertension, and at the time of transplantation in two patients.
Dr D. Van Raemdonck (Leuven, Belgium): Could you give us an idea on the incidence of postoperative bleeding and on your approach how to tackle bleeding coming from the posterior mediastinum through a median sternotomy?
Dr Goerler: I think that is a problem that occurs more and more nowadays since we have more and more patients undergoing redo-operations. Because of bad experience with intraoperative bleeding we consider multiple pleuro-pulmonary collaterals a contraindication for heart–lung transplantation. Therefore, we perform CT scan in every patient that is presented for heart–lung transplantation to exclude this kind of collateral. This year we had to reject two patients because of that reason.
Dr W. Klepetko (Vienna, Austria): I have two questions. First of all, I think we all are aware that it is very difficult to precisely time the transplantation for patients with congenital heart disease. So I would like to hear about your policy in that regard. For instance, we have found some patients to be very stable on our waiting list, and they remained in this status over years.
The second question I would like to raise is in regard to the techniques. Do you see a place for domino transplantation in patients with VSD and Eisenmenger syndrome, where the heart is repaired on the backtable and used for transplantation in another patient. And if you would allow me a final remark, I was a bit surprised to see a paper which overviews such a long period of time with such a large patient population with only two coauthors.
Dr Goerler: The first question is very hard to answer, especially because we all know that the waiting time for heart–lung transplantation is quite long. You have to decide individually for every patient when to put him on the waiting list for heart–lung transplantation.
For the second question, we did not do any domino transplantation during the last years, but it may be a further option to overcome the shortage of donor organs.
| Footnotes |
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| References |
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This article has been cited by other articles:
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N. D. Patel, E. S. Weiss, J. G. Allen, S. D. Russell, A. S. Shah, L. A. Vricella, and J. V. Conte Heart transplantation for adults with congenital heart disease: analysis of the United network for organ sharing database. Ann. Thorac. Surg., September 1, 2009; 88(3): 814 - 821. [Abstract] [Full Text] [PDF] |
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P. A. Corris and J. D. Christie Update in Transplantation 2007 Am. J. Respir. Crit. Care Med., May 15, 2008; 177(10): 1062 - 1067. [Full Text] [PDF] |
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