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Eur J Cardiothorac Surg 1999;15:283-288
© 1999 Elsevier Science NL
a Department of Cardiac Surgery, Research Institute of Angiocardiology, Faculty of Medicine, Kyushu University, Fukuoka, Japan
b Department of Cardiovascular Surgery, Fukuoka Children's Hospital, Fukuoka, Japan
Received 20 September 1998; received in revised form 2 November 1998; accepted 10 November 1998.
Corresponding author. Tel.: +81-92-642-5556; fax: +81-92-642-5566; e-mail: masuda@heart.med.kyushu-u.ac.jp
| Abstract |
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Key Words: Arterial switch operation Double-outlet right ventricle Taussig-Bing anomaly Subpulmonary ventricular septal defect Lecompte maneuver
| Introduction |
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The arterial switch operation with ventricular septal defect closure seems to be feasible in a more substantial number of patients than the intraventricular repair [10], especially in the cases with anteroposterior relationship of the great arteries [4] [7] [8] [10]. In this article, we evaluated the clinical results of the arterial switch operation for DORV with subpulmonary VSD, including the late results with a follow-up as long as 9.9 years.
| Patients and methods |
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Eight patients had undergone previous palliative procedures (Table 2). All patients with a coarctation of the aorta underwent a two-stage repair, while all patients except for one with an interrupted aortic arch had a one-stage repair.
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Operative management
All patients underwent an operation through a mid-sternotomy using cardiopulmonary bypass with moderate hypothermia, except for the patients with an interrupted aortic arch in which deep hypothermia with the circulatory arrest of the lower body was employed. Myocardial protection was done with cold hyperkalemic crystalloid cardioplegic solution containing 5% albumin.
The VSD was closed through a right ventriculotomy or right atriotomy to introduce the left ventricular blood to the pulmonary artery (Table 2). Two patients had multiple ventricular septal defects, one of which was found postoperatively. In another patient, three ventricular septal defects were closed with one patch. A resection of the outlet septum with/without ventriculo-infundibular fold was performed in the most recent 14 patients. A patch enlargement of the right ventricular outflow tract to relieve the stenosis was additionally performed in two patients. The enlargement of the ventricular septal defect was required in two patients. Among five patients with an abnormal conal insertion of the tricuspid valve chordae, one patient required a reattachment of the chordae. In the remainder four patients, the ventricular septal defect had been able to close without a reattachment of the chordae.
After closure of the VSD, an arterial switch was performed including a translocation of the coronary arteries. The Lecompte maneuver was used for the reconstruction of the pulmonary artery in all but five cases with side by side relation of the great arteries, in which the original Jatene procedure was employed to prevent pulmonary stenosis. In the subset with side by side relation of the great arteries, intraoperative conversion from the Lecompte maneuver to the original Jatene procedure due to pulmonary stenosis was done in two patients, while an intraoperative conversion of the original Jatene procedure to the Lecompte maneuver due to coronary artery trouble was performed in one patient. A reconstruction of the pulmonary artery was done using the xenopericardium in the early era, while an autologous pericardium or direct anastomosis (modification of the Pacifico's method [15]) was used in the most recent cases.
A repair of an interrupted aortic arch, including a re-do procedure was done in four patients simultaneously. One patient also required plasty of the peripheral pulmonary artery simultaneously.
The mean follow-up of 3.3±2.8 years (up to 9.9 years) was achieved in all but two survivors. The actuarial survival and freedom from reoperation rates were calculated by the KaplanMeier method. The statistical analysis was carried out using Stat View (Abacus Concepts, Berkeley, CA) on a Macintosh computer.
| Results |
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Late results
A reoperation was necessary in seven survivors and no operative mortality occurred. Relief of a right ventricular outflow tract obstruction was necessary in two patients who had been operated on in the early era, and had not undergone a resection of the outlet septum at the time of the arterial switch operation. One of them underwent a mitral valve replacement and plasty of the ascending aorta simultaneously. Anastomotic stenosis of the pulmonary artery with/without peripheral pulmonary stenosis developed in five patients who underwent an arterial switch procedure with the Lecompte maneuver (three in the anteroposterior relation and two in the side by side relation of the great arteries) in the early era. One of them underwent a concomitant operation to relieve supra-aortic stenosis. Another patient required an implantation of a permanent pacemaker. A re-coarctation of the aorta was recognized in another patient, and was successfully repaired by balloon angioplasty. The freedom rate from reoperation at 9 years was 46±20% (
Fig. 1
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Residual VSD was recognized in one patient with multiple VSD, which had not been diagnosed before the arterial switch operation. As the residual VSD is thought to be insignificant, the patient did not require a reoperation.
There were three late deaths. The causes of late death were myocardial infarction due to occlusion of the left coronary artery 6 months after the operation in one patient, acute heart failure for some unknown reason 5 months after the operation in one, and sudden death in one already described. The actuarial survival rate at 9 years was 83±8%.
| Discussion |
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The intracardiac structures and the relationship of the great arteries both play an important role in selecting the type of anatomic repair. We performed an intraventricular repair in one patient with anteroposterior great artery relation (PatrickMcGoon operation [1]). In this patient, a right outflow tract obstruction developed and a reoperation to relieve this obstruction was thus required. Recently, the left ventricular outflow tract obstruction with a peak pressure gradient 25 mmHg developed in this patient, who has thus been followed carefully. Thereafter, our indications for an intraventricular repair are only limited in cases with side by side relation of the great arteries similar to those of many other surgeons [4] [8] [10]. For the intraventricular repair with side by side relation of the great arteries (Kawashima operation [2]), the distance of the tricuspid-pulmonary valve should be big enough in order to avoid any subsequent left ventricular outflow tract obstruction. The optimal distance of the tricuspid-pulmonary valve for intraventricular repair seems to differ for each surgeon [4] [7] [8] [10] [12]. Our criteria for this distance is greater or equal to the aortic valve diameter, and five patients who had no abnormal insertion of the tricuspid chordae to the outlet septum underwent the Kawashima operation. As a result, our recent criteria for intraventricular repair is quite limited and this procedure is only indicated in cases with side by side relation of the great arteries, when the distance of the tricuspid-pulmonary valve is greater or equal to the aortic valve diameter, and with no abnormal insertion of the tricuspid chordae to the outlet septum. For all other patients, the arterial switch procedure with ventricular septal defect closure is recommended.
In the early era, we did not recognize the importance of a resection of the outlet septum in the arterial switch procedure, which thus resulted in a subsequent right ventricular outflow tract obstruction in two cases. Fortunately, we have not seen this problem after introducing a vigorous resection of the outlet septum with/without a combined resection of the ventriculo-infundibular fold.
In the arterial switch procedure, a decision must be made regarding whether or not to perform the Lecompte maneuver. We performed the Lecompte maneuver in all cases with anteroposterior relation of the great arteries and in seven out of 12 with side by side relation of the great arteries. Anastomotic and/or peripheral pulmonary stenosis had developed and had to be repaired in five cases among them. Postoperative pulmonary stenosis is now known to be the most common complication after an arterial switch operation for the transposition of the great arteries [16] [17] [18]. A refined analysis revealed the risk factors of postoperative pulmonary stenosis to include: the use of foreign materials to close the defect of the excised coronary button (xenopericardium), over-stretching of the left pulmonary artery by the neo-aorta after the Lecompte maneuver, and so on [17]. To manage this problem, we now dissect the pulmonary artery as much as possible to avoid kinking. The reconstruction of the pulmonary artery is done without any foreign materials if possible, or with the autologous pericardium if no direct amastomosis is possible [17]. Patch plasty of the left pulmonary artery with autologous pericardium would be adopted if necessary. Although many surgeons seem to prefer the Lecompte maneuver even in cases with side by side relation of the great arteries [10], reconstruction of the pulmonary artery without a translocation of the pulmonary artery (the original Jatene procedure) might be a useful alternative.
The translocation of the coronary arteries without any obstruction of coronary flow is mandatory for the arterial switch procedure. When the relationship of the great arteries is anteroposterior, the most common coronary pattern was Shaher type 1 (or the so-called transposition of the great arteries type coronary). When the relationship of the great arteries is side by side, various types of coronary patterns are observed, and the left coronary artery (main trunk or circumflex artery) courses behind the pulmonary artery quite frequently. These results were compatible to those of other reports [8] [19] [20] [21]. Intraoperative coronary trouble was observed in three patients, one due to technical problems and the trouble was solved by a re-arrangement of coronary translocation. In the other two patients, the coronary trouble was caused by the compression of the coronary artery from the pulmonary artery placed behind the neo-aorta (the original Jatene procedure) in cases with side by side relation of the great arteries. One of these cases was managed by a translocation of the pulmonary artery in front of the neo-aorta (Lecompte maneuver), while the other patient died due to a low cardiac output. Although we consider the original Jatene procedure to be a useful alternative to the Lecompte maneuver in cases with side by side relation of the great arteries to prevent pulmonary stenosis, great care should be paid when the left coronary artery courses behind the pulmonary artery. Kurosawa et al. [22] reported difficulties in cases with side by side relation of the great arteries managed by the Lecompte maneuver. He speculated that, in such cases, the new aorta must be forced beneath the pulmonary artery and may thus compress the left coronary artery that courses behind the new aorta. Fortunately, we have not encountered any such complications in our series.
The future possible development of aortic incompetence is a disadvantage of the arterial switch operation to the intraventricular repair [10] [17] [19]. In our series, aortic incompetence remained less than moderate in most cases, and no aortic valve replacement was required. However, in our experience with 226 arterial switch operations, previous pulmonary artery banding is supposed to be a risk factor for aortic incompetence [17] and two patients also underwent aortic valve replacement. A further long-term follow-up is required before any definite conclusions can be made regarding this matter.
The association of arch anomalies is frequently seen in this anomaly [8] [10] [11] [21]. A repair of the aortic arch obstruction in a one-stage or in two-stage procedure remains controversial, although the one-stage procedure has recently become increasingly popular [11] [23]. Our strategy for the coarctation complex is a two-stage repair using subclavian flap aortoplasty with/without pulmonary artery banding, while our strategy for the interrupted aortic arch complex is a one-stage repair. According to these strategies, all patients with coarctation of the aorta in this series had a two-stage procedure, while all patients except for one with an interrupted aortic arch had a one-stage procedure. Based on our results in this series, we consider our strategy to be satisfactory, however, we are also presently considering the use of a one-stage repair in patients with coarctation complex.
In conclusion, the double-outlet right ventricle with subpulmonary VSD has complex features, including an aortic arch obstruction and coronary artery anomalies. An optimal definitive surgical repair using an arterial switch operation can be performed safely with a thorough understanding of this variable anomaly. The prevention of a right ventricular outflow tract obstruction during an arterial switch operation may improve the occurrence of late morbidity.
| Acknowledgments |
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| Footnotes |
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| Appendix A. Conference discussion |
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Dr Masuda: Two-stage repair for the coarctation of the aorta and one-stage repair for the interrupted aortic arch.
Dr Moll: Then you believe that staged operation for coarctation is better than one-stage completion of operation?
Dr Masuda: I'm not sure it's better, as we don't have the experience with one-stage repair for coarctation of aorta combined with DORV with subpulmonary VSD. However, as I mentioned in this paper, two-stage operation can be done quite safely and it's not needed to do in one-stage. But from the recent trend, we start to consider one-stage repair.
Dr Moll: Did you find this stenosis, late pulmonary stenosis, in the place of anastomosis or most of them were subpulmonary stenosis?
Dr Masuda: We have seven cases with right ventricular outflow obstruction in this series and two subpulmonary, or subvalvular, and five cases with anastomotic site or peripheral pulmonary stenosis.
Dr Moll: What was the technique of connection of the pulmonary artery? Do you use a patch?
Dr Masuda: To pulmonary?
Dr Moll: Yes, to pulmonary.
Dr Masuda: In the early era we used xenopericardium to fill up the defect of the coronary button. Recently, we noticed that was the reason for anastomotic site stenosis for this type of operation, and we have started to use the Pacifico's modification, direct anastomosis of the pulmonary artery, or to use the autologous pericardium to fill up the defect. Then we didn't see the subsequent pulmonary stenosis afterwards.
Dr Moll: As the pulmonary artery is big and you can do it directly, I am asking why do you do it? Do you think it's better to use pericardium?
Dr Masuda: No. We prefer to use the direct anastomosis, of course. However, if we can't do that, we prefer to use the autologous pericardium.
Dr Moll: Because usually in these cases the pulmonary artery is very big and you can do it easy.
Dr Masuda: I completely agree with you.
Dr J. Quaegebeur (New York, NY, USA): I obviously agree with your policy in performing arterial switch operations for this type of anatomy. When you have a neonate 1 week of age, what is your policy? You believe there is still a role in pulmonary artery banding or would you do a primary full repair?
Dr Masuda: We have no experience with such a young age. Our youngest patient is 10 days old, but I think...
Dr Quaegebeur: Well, 10 days old, fine.
Dr Masuda: We would perform the arterial switch operation.
Dr Quaegebeur: I agree with that, yes.
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