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J Thorac Cardiovasc Surg 2004;127:555-562
© 2004 The American Association for Thoracic Surgery
Cardiothoracic transplantation |
a Departments of Cardiovascular Surgery, Ospedali Riuniti di Bergamo, Bergamo, Italy
Received for publication April 16, 2003; revisions received June 20, 2003; accepted for publication August 1, 2003.
* Address for reprints: Amedeo Terzi, U.O. Cardiochirurgia, Ospedali Riuniti di Bergamo, Largo Barozzi 1, Bergamo 24100, Italy
terzia{at}cyberg.it
| Abstract |
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METHODS: From 1990 to 2002, 14 patients underwent heart transplantation in our institution after a previous Fontan procedure. The mean age at the time of the Fontan operation and at transplantation was 7.3 ± 2.8 and 17.2 ± 6.3 years, respectively. The indication for transplantation was protein-losing enteropathy in 7 patients, arrhythmia with ventricular dysfunction in 5 patients, and heart failure in 2 patients. All patients received basic immunosuppressive therapy with cyclosporine (INN: ciclosporin) and azathioprine without induction therapy or maintenance steroids.
RESULTS: Two hospital deaths occurred: one patient died on the fifth postoperative day of graft failure, and the second died on the 17th postoperative day after an acute neurologic event. Two patients died later, one 23 months after transplantation of acute rejection and the other after 90 months of chronic rejection and endocarditis. One patient underwent successful reintervention 2 years after heart transplantation for pulmonary vein obstruction. The 10 surviving patients are in New York Heart Association class I, with a mean follow-up of 64.5 ± 42 months. One of them was delivered of a healthy baby 5 years after transplantation. Patients with protein-losing enteropathy reached a normal protein level within a mean of 10 months (range, 6-18 months) after transplantation. Four patients required a temporary administration (3-6 months) of oral steroid therapy for recurrent rejection episodes. Currently, 7 patients are taking cyclosporine, and 3 are taking cyclosporine and azathioprine. The actuarial survival at 1, 5, and 10 years was 86% ± 9%, 77% ± 12%, and 62% ± 17%, respectively.
CONCLUSION: Heart transplantation is a good option for patients with a failing Fontan operation. We documented the reversibility of protein-losing enteropathy in all patients. No mortality caused by surgical complications was observed.
| Materials and methods |
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The clinical characteristics of our patient population are detailed in Table 1. Overall, before transplantation, the 14 patients underwent 36 surgical procedures. Sixteen operations consisted of pre-Fontan palliative procedures, 14 were Fontan operations, 4 were redo Fontan operations, and 2 were second redo Fontan operations.
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The mean age at the time of the Fontan operation was 7.3 years (range, 3-30 years) and 17.6 years (range, 5.3-33.8 years) at the time of heart transplantation, with a mean weight of 42.8 kg (range, 13-90 kg).
Indications for heart transplantation were as follows:
A pretransplantation cardiac catheterization was performed in 12 patients. It is noteworthy that the 7 patients with PLE had a mean pulmonary pressure of 14.6 ± 2.5 mm Hg, and no gradient was detected in any segment of the Fontan connection. Five of the 7 patients with ventricular dysfunction, arrhythmias, or both had a mean pulmonary pressure of 19.4 ± 3.4 mm Hg. All patients with failing Fontan operations referred for cardiac transplantation were listed and underwent heart transplantation.
Surgical technique
Harvesting the donor heart, we took as much donor conduits as possible to meet the needs for recipient reconstruction. Implant strategy was modified according to the variety of the anatomic situations encountered (different previous palliations and congenital abnormalities). In 2 patients cannulation of the femoral vessels was performed before sternotomy because of the proximity of the cardiovascular structure to the undersurface of the sternum; in these patients dissection proceeded uneventfully without extracorporeal circulation. In one patient emergency femorofemoral cardiopulmonary bypass was instituted because of right atrial hemorrhage during sternotomy: bleeding was eventually controlled, and the patient recovered uneventfully. All heart transplantations except 2, in which deep hypothermia was needed to control excessive collateral circulation, were performed under moderate hypothermia (24°C-28°C). After cardiectomy and takedown of the Glenn shunt, atriopulmonary anastomosis, or both, the pulmonary arteries were reconstructed by using different techniques. A bovine pericardium patch was used in 3 patients, a polytetrafluoroethylene patch was used in 2 patients, a recipient redundant right atrial wall was used in 2 patients, and donor pulmonary artery bifurcation tissue was used in 3 patients. Direct reconstruction of pulmonary artery continuity was easily done without patch interposition in the remaining 4 patients. Because patients with failing Fontan operations usually do not have conspicuous cardiomegaly, we tried to avoid significant weight mismatch between donors and recipients, particularly when an extensive reconstruction of the pulmonary arteries was required or when diffuse pleural adhesions caused by a previous thoracotomy were present.
The implantation of the new heart was performed with atrial anastomoses in 7 patients and with direct caval anastomoses in the other 7 patients, according to surgeon's preference and anatomic suitability (TCPC). No patient had persistent bleeding after the operation.
The donor mean age was 14.2 ± 8.5 years, the mean weight was 52.1 ± 23.7 kg, and the mean ischemic time was 181 ± 83 minutes.
Immunosuppressive therapy
According to our standard transplantation protocol, these patients started their immunosuppressive regimens with cyclosporine and azathioprine. Neither antithymocyte nor antilymphocyte globulin nor other induction therapies were administered. The rejection episodes were treated with a 3-day therapy of high-dosage intravenous methylprednisolone (15 mg · kg-1 · d-1), followed by an oral course of prednisone in case of consecutive rejections.
Follow-up monitoring
After discharge, the patients have been followed with physical examination, echocardiography, electrocardiography, and blood testing every 1 to 3 months in the first postoperative year and every 3 to 4 months subsequently. Myocardial biopsy was routinely performed only in patients aging more than 6 years during the first postoperative year.
| Results |
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Of the 12 survivors, only one patient had inadequate cardiac output that required high inotropic support for a few days, and subsequently pancreatitis and cytomegalovirus and Staphylococcus species infection developed. He eventually recovered but underwent pacemaker implantation for a persistent atrioventricular block. A second patient required surgical plication of a paretic left diaphragm, and a third patient underwent successful reoperation 3 weeks after heart transplantation for acute thrombosis of the superior vena cava after a transjugular myocardial biopsy.
The intubation time was shorter than 24 hours in the 7 patients who had a remarkably straightforward recovery and between 2 and 16 days (mean, 6 days) in the remaining 7 patients. Intensive care stay was 2 to 23 days (mean, 6.5 days), and in-hospital recovery was 19 to 90 days (mean, 35 days).
Late results
Two patients died after hospital discharge. The first died 23 months after heart transplantation of an episode of sudden acute rejection of the graft. She had been receiving treatment with cyclosporine and azathioprine, and of the 14 myocardial biopsies performed after heart transplantation, only 3 showed mild or moderate rejection.
The second death occurred in a patient waiting retransplantation for severe chronic rejection 90 months after the initial heart transplantation. The patient had been readmitted to the hospital in multiorgan failure and died of a concomitant acute aortic endocarditis.
The 10 remaining patients, with a mean follow-up of 64.5 ± 42 months (range, 9.2-123 months) are actually in good condition with normal heart function.
Actuarial patient survival, according to Kaplan-Meier estimates, is 86% ± 9%, 77% ± 12%, and 62% ± 17% at 1, 5, and 10 years, respectively (Figure 1).
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Patient 1, a 35-year-old women operated on 3 times for various Fontan modifications, was delivered of a healthy baby by means of caesarian section 5.5 years after heart transplantation.
In the 6 patients with previous PLE, the protein level reached a normal value after 6 months in 4 patients and after 18 months in 2 patients (Figure 2). Mean serum protein levels were as follows during the 68 months of mean follow-up (range, 12-123 months): 3.91 ± 0.42 g/dL at 1 month, 6.26 ± 2.3 g/dL at 6 months, 6.38 ± 1.8 g/dL at 12 months, 7.06 ± 0.61 g/dL at 18 months, and 7.42 ± 0.6 g/dL at the last control.
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Of the 10 late survivors, 7 patients are receiving monotherapy with cyclosporine for azathioprine intolerance. Two patients are taking cyclosporine and azathioprine, and one is taking cyclosporine and mycophenolate mofetil. The cyclosporine oral dose is, on average, 5 ± 1.6 mg · kg-1 · d-1. The mean blood creatinine level of the 10 patients was 1.12 mg/dL.
| Discussion |
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Conversion to TCPC with ablative surgery has been reported as an effective method to treat refractory atrial arrhythmia after the Fontan procedure.16,17 In our experience 14 patients affected by untreatable arrhythmia after Fontan correction underwent TCPC conversion and ablative surgery. One patient died early of bronchopneumonia, and 13 had good late results. The 5 patients who underwent heart transplantation for arrhythmia were definitively a different subset of patients because of the concomitant presence of ventricular dysfunction. One patient (no. 13) required heart transplantation because after conversion elsewhere to TCPC for arrhythmia, PLE developed. Our opinion is that when arrhythmias are associated to detectable ventricular dysfunction, the patients should preferably listed for heart transplantation.
Overall, compared with our global experience with heart transplantation, the patient undergoing heart transplantation after a failed Fontan operation had a lower incidence of acute rejection episodes despite a reduced immunosuppressive therapy. In the 12 early survivors, the incidence of acute rejections that needed treatment was 1.58 episodes per patient compared with 4.6 episodes per patient in our global heart transplantation experience during a comparable length of follow-up.26 Currently, 7 patients are receiving cyclosporine monotherapy, and none is taking steroids. This is in contrast with our global experience, in which steroids had to be chronically introduced in 15% of the patients because of repeated rejection episodes. Because of the small number of patients, it is impossible to demonstrate a lower immunoreactivity in this group of patients. However, we would like to speculate that the low rejection rate could be a consequence of a long disease and repeated previous blood transfusion, plasma transfusion, or both. The presence of previous surgical operations and a long history of disease has not been shown to be an incremental risk factor. Heart transplantation in these patients is a long and complex operation in which the surgical experience in the congenital field coexisting with the transplantation expertise of the surgical center might play a fundamental role.
In conclusion, this retrospective analysis is encouraging, showing that heart transplantation has satisfactory early and midterm results after a failed Fontan operation. Survivors have been shown to enjoy a good quality of life. We documented the reversibility of PLE in all cases, but a longer follow-up in a bigger number of patients is required to draw definitive conclusions.
| References |
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