Selection of a Surgical Treatment Approach for Aortic Coarctation in Adolescents and Adults
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1 Ann Thorac Cardiovasc Surg 2018; 24: Online February 16, 2018 doi: /atcs.oa Original Article Selection of a Surgical Treatment Approach for Aortic Coarctation in Adolescents and Adults Eisaku Nakamura, MD, PhD, Kunihide Nakamura, MD, PhD, Koji Furukawa, MD, Hirohito Ishii, MD, and Katsuya Kawagoe, MD Purpose: Coarctation of the aorta (CoA) in adolescents and adults is relatively rare. Several operative techniques for CoA in adolescents and adults have been reported, but there is still no consensus. This study aims to highlight the use of individual patient characteristics to select optimal treatment strategies for CoA in adolescents and adults. Methods: Surgical repair of CoA was performed in five patients (mean age: 34 ± 14 years, range: years). All patients had primary CoA, and one had aneurysm above the CoA. One patient had undergone previous aortic valve replacement (AVR) and graft replacement of the ascending aorta. One patient underwent resection of the coarctation without cardiopulmonary bypass (CPB) followed by direct end-to-end anastomosis. Three patients underwent CoA resection with an interposition graft through a lateral thoracotomy with partial CPB. One patient underwent AVR with extra-anatomical bypass (ascending descending aorta). Results: No in-hospital deaths occurred, and there were no complications. During the follow-up period, there has been no recurrence of CoA. Conclusion: CoA in adolescents and adults is associated with different issues from those encountered in infant patients, and comprehensive surgery should be performed in all cases. Keywords: coarctation of the aorta, adolescents and adults, surgical treatment Introduction Coarctation of the aorta (CoA) is a common congenital heart disease defined as congenital stenosis of the aorta. CoA accounts for 57% of all congenital heart disease cases, with an incidence of approximately 3 cases per 10,000 births. 1,2) CoA is almost always diagnosed in neonatal and infant patients, and congenital heart surgery Division of Cardiovascular Surgery, Department of Surgery, University of Miyazaki, Miyazaki, Miyazaki, Japan Received: September 14, 2017; Accepted: December 19, 2017 Corresponding author: Eisaku Nakamura, MD, PhD. Division of Cardiovascular Surgery, Department of Surgery, University of Miyazaki, 5200 Kihara, Kiyotake, Miyazaki, Miyazaki , Japan ei-naka-1965@mtb.biglobe.ne.jp 2018 The Editorial Committee of Annals of Thoracic and Cardiovascular Surgery. All rights reserved. for CoA is well established in infant patients. Treatment of adult CoA is challenging due to complication with other cardiac diseases, vascular abnormalities such as aneurysm, and possible CoA recurrence. Therefore, several operative techniques exist for CoA repair. Here, we report our experience with five cases of CoA in adolescents and adults. Materials and Methods Study population Between 2006 and 2016, five adolescent and adult patients underwent CoA repair. Two patients were males, and three were females (mean age: 34 ± 14 years, range: years). Preoperative findings are summarized in Table 1. Only one case had dyspnea. Four cases were complicated by bicuspid aortic valves and hypertension, one case was complicated by Turner syndrome. Ann Thorac Cardiovasc Surg Vol. 24, No. 2 (2018) 97
2 Nakamura E, et al. Table 1 Preoperative findings Patient No Age (years) Sex M F F M F BSA (m 2 ) Hypertension Bicuspid valve Aneurysm - - Arch Ascending - PG across CoA (mmhg) Other complication Turner syndrome AR Prior intervention p/o AVR + Asc.Ao.Rep - CoA: Coarctation of the aorta; Asc.Ao.Rep: ascending aorta replacement; BSA: body surface area; PG: pressure gradient; AR: aortic regurgitation Two cases were complicated by other cardiac disease. All patients underwent primary repair for CoA, and the CoA was located in the region of the aortic isthmus in all patients. One patient had aneurysmal dilatation of the aorta above the aortic narrowing at the isthmus without a substantial pressure gradient (pseudo-coarctation). A B Operative procedure In four patients (No. 1 4), standard posterolateral thoracotomy was performed after insertion of a doublelumen endotracheal tube, while median sternotomy was performed in one patient (No. 5). Four patients (No. 2 5) were treated for CoA using cardiopulmonary bypass (CPB). In three patents (No. 2 4), partial CPB from the femoral vein to the femoral artery was used. Patient No. 5 was treated with full CPB. In all patients (CPB and non-cpb), surgery was performed at normal room temperature. In patient No. 1, the length of abnormal aortic wall was approximately 2 cm, and operative femoral blood pressure decreased mildly (pre-clamp: 70 mmhg, postclamp: 65 mmhg) in a tentative aortic clamping trial. Then, patient No. 1 underwent resection of the CoA without using CPB, and a direct end-to-end anastomosis was performed (Fig. 1). Patient No. 2 underwent CoA resection with interposition graft. Patient No. 3 suffered from CoA accompanied by an arterial aneurysm in the aortic arch and underwent partial graft replacement of the aortic arch with CoA resection through posterolateral thoracotomy (Fig. 2). Patients No. 4 and 5 suffered from concomitant cardiac disease and underwent two-stage and single-stage surgeries, respectively. Patient No. 4 first underwent an aortic valve replacement (AVR) and graft replacement of the ascending thoracic aorta. CoA resection with Fig. 1 Three-dimensional CT. (A) Preoperative view. (B) Postoperative view. A direct end-to-end anastomosis was performed. CT: computed tomography interposition graft was subsequently performed via posterolateral thoracotomy. In patient No. 5, AVR with extra-anatomical bypass (ascending descending aorta) was performed (Fig. 3). The graft was passed through an incision on the posterior part of the pericardium and positioned along the right ventricle. Results No in-hospital deaths occurred, and there were no complications such as reoperation for bleeding, renal failure, spinal cord injury, stroke, myocardial failure, left recurrent laryngeal nerve injury, or chylothorax. For the three patients treated for CoA using partial CPB, mean CPB time was 70 ± 18 min. For the patient treated with total CPB, CPB time was 251 min. The mean operative time was 436 ± min. The mean stay in the intensive care unit was 3.8 ± 1.9 days (range: 2 7 days), and mean total hospital stay was 20.8 ± 8.9 days 98 Ann Thorac Cardiovasc Surg Vol. 24, No. 2 (2018)
3 Adolescent and Adult Aortic Coarctation Surgery A B Fig. 2 Three-dimensional CT. (A) Preoperative view showing aneurysmal dilatation of the aorta above the aortic narrowing. (B) Postoperative view. Patient No. 3 underwent partial graft replacement of the aortic arch. CT: computed tomography Fig. 3 Three-dimensional CT. (A) Preoperative view. (B) Postoperative view. Patient No. 5 was treated with extraanatomical bypass (ascending descending aorta). CT: computed tomography (range: 6 27 days). Operative and postoperative findings are summarized in Table 2. During the follow-up period (75 ± 49 months), there has been no recurrence of CoA. Discussion A Congenital heart surgery for CoA is well established in infant patients. However, when patients present CoA later in life, the vessels are much more friable, and the intercostal arteries are larger and more easily damaged, making dissection potentially more hazardous. In addition, some cases may be complicated by additional cardiovascular disease, previous surgery, and/or CoA B Table 2 Operative and postoperative findings Patient No Approach Thoracotomy Thoracotomy Thoracotomy Thoracotomy Median Operative procedure Direct end to end Interposition graft Interposition graft Interposition graft Extra bypass graft + AVR Graft size - 20 mm 20 mm 20 mm 12 mm Operative time (min) Cross-clamp time (min) Lowest rectal temparature ( C) CPB - Partial CPB Partial CPB Partial CPB Total CPB Hospital stay (days) Mobility Mortality PG across CoA (mmhg) CPB: cardiopulmonary bypass; AVR: aortic valve replacement; CoA: coarctation of the aorta; PG: pressure gradient Ann Thorac Cardiovasc Surg Vol. 24, No. 2 (2018) 99
4 Nakamura E, et al. recurrence (10% 44.7%). 3 8) Therefore, several operative techniques have been proposed for CoA repair in adolescents and adults depending on individual patient circumstances. The surgical procedures can be roughly divided into three categories: resection with end-to-end anastomosis, CoA resection with interposition graft, and extra-anatomical bypass without CoA resection. CoA resection with end-to-end anastomosis was performed by Crafoord and Gross in 1945 through a lateral thoracotomy. 9) CoA resection with end-to-end anastomosis has the advantage of resecting the abnormal aortic wall with ductal tissue rather than using a prosthetic graft and is therefore considered the ideal procedure. In neonate patients, CoA resection with end-to-end anastomosis is easily performed after extended resection, but in adolescents and adults, CoA resection with end-to-end anastomosis is more technically challenging due to the thickness of the aortic wall, difficulties in aortic arch mobilization, severe calcification, and large collateral arteries. We performed CoA resection with end-to-end anastomosis in patient No. 1 because the aortic arch distal to the left carotid artery and the descending aorta were easily mobilized from the root of the neck to a distance well below the CoA. Furthermore, since patient No. 1 is expected to continue growing, we wanted to avoid using a prosthetic graft. Although this procedure is occasionally performed in adults, 10) we believe that its indication is limited (e.g., young cases, short-segment CoA) because its difficulty increases in patients who present later in life. In addition, Sandro et al. reported that an intraoperative femoral blood pressure of <50 mmhg on tentative aortic clamping trial necessitates repair of the CoA using CPB to protect the spine and lower body. We performed the operation without CPB in patient No. 1 because intraoperative femoral blood pressure was 65 mmhg. 11) CoA resection with interposition graft as described by Gross was performed via lateral thoracotomy. 12) This procedure is recommended particularly in cases of longsegment CoA and CoA with aneurysm formation. 7,13) In adults, this procedure may be preferable for many surgeons because the disadvantage of the tube graft not growing with the patient is not a concern. Moreover, this procedure can be used to perform resection of CoA and abnormal vessel features such as aneurysm. On the other hand, its major disadvantages are the longer cross-clamp time for two anastomoses. CPB was used to avoid injury to the spinal cord and visceral organs caused by distal ischemia related to the longer cross-clamp time. 5,7,8,13) Our three cases (patient No. 2, No. 3, and No. 5) underwent CoA resection with interposition graft using partial CPB. Other studies have reported avoiding distal ischemia using a Gott shunt 14) or intraluminal shunt. 15,16) In more complicated cases, the use of total CPB and hypothermic circulatory arrest for minimal dissection has been recommended as a surgical procedure for CoA, after which CoA resection with interposition graft or CoA resection with end-to-end anastomosis is performed. 7) Elkerdany et al. also reported good outcomes in adults after the treatment of isolated CoA by left subclavian-aortic bypass. 17,18) This procedure avoids dissection through the hard adhesions between the CoA and surrounding organs; however, it cannot be used in the hypoplastic arch, and abnormal aortic wall remains. In adults, we may also encounter the need to perform surgery for cases of CoA recurrence and CoA with other cardiac disease. In these cases, extra-anatomical bypass without CoA resection is recommended in some patients. 19) Interposition grafting is difficult in recurrent CoA repair via left thoracotomy due to adhesion. Consequently, reoperation via left thoracotomy has a high incidence of postoperative complications, with reported mortality and morbidity rates of 0 8% and 50%, respectively. 19) Since the approach for extra-anatomical bypass is performed via median sternotomy or right thoracotomy, it avoids the complications associated with repeated left thoracotomy. In addition, extra-anatomical bypass via median sternotomy can be performed even in cases where concomitant surgical repair of CoA and another cardiovascular disease is planned. Mesnildrey et al. 20) reported that 37% of adult CoA cases presented with cardiopathy. In such cases, two-stage repair, single-stage repair with median sternotomy and left thoracotomy, and single-stage repair with extra-anatomical bypass have been reported. Among these procedures, single-stage repair with extra-anatomical bypass may lower both the associated risk and patient discomfort. 21) In this procedure, proximal anastomosis is typically performed in the ascending thoracic aorta, but the appropriate site of distal anastomosis (abdominal aorta or descending thoracic aorta) is still under debate. 17,21,22) Patient No. 5 was treated by AVR with extra-anatomical bypass (ascending descending aorta) in a single-stage repair. We opted for single-stage repair in Patient No. 5 because Turner s syndrome and cognitive dysfunction were observed in addition to heart disease. In patient No. 5, computed tomography (CT) demonstrated aneurysm 100 Ann Thorac Cardiovasc Surg Vol. 24, No. 2 (2018)
5 Adolescent and Adult Aortic Coarctation Surgery formation distal to the CoA site preoperatively. However, the aneurysm diameter was only 40 mm, and to avoid high operative risk, we did not perform aneurysm resection with interposition graft in this patient. This patient is currently receiving follow-up care involving annual CT to monitor the aneurysm. There were two possible routes of extracardiac bypass graft in the pericardium. In the route of the graft leading around the left aspect of the heart, the length of the graft was shorter, but there was a possibility of graft kinking and compression of surrounding structures. In the route of the graft leading around the right aspect of the heart, avoids the risk associated with re-sternotomy, as the graft is not near the sternum. Since patient No. 5 was young, we chose the route around the right aspect of the heart to allow for the possibility of re-sternotomy. In patient No. 4, we first performed an AVR and graft replacement of the ascending thoracic aorta. CoA resection with interposition graft was subsequently performed via posterolateral thoracotomy. In this patient, it was necessary to treat aortic regurgitation (AR), aneurysm of the ascending thoracic aorta, and CoA. Considering the invasiveness to the patient, we performed two-stage repair intentionally. However, the first and second surgeries were separated by a 19-month period because the patient did not wish to undergo an additional procedure after becoming asymptomatic after the first operation. If possible, we recommend single-stage repair with extra-anatomical bypass. In addition, endovascular therapy is becoming more widespread for the treatment of CoA. In 1982, transcatheter balloon angioplasty was initially reported by Singer et al. in infants. 23) Subsequently, this treatment has spread to adult patients, and good results have been reported using stents. However, due to the higher rates of recurrence and aneurysm formation associated with endovascular treatment, patients treated with this method require long-term follow-up. 24) In summary, CoA resection using interposition graft with CPB is recommended for spinal cord and lower body protection in adult patients. However, in adolescents, resection with end-to-end anastomosis should also be considered if continued growth is expected. The use of CPB may not always be necessary because the end-to-end anastomosis ends in a short time, but CPB should be used when the intraoperative femoral blood pressure is <50 mmhg on tentative aortic clamping trial. In cases of CoA recurrence and CoA with other cardiac disease, extra-anatomical bypass without CoA resection should also be considered. Conclusion The treatment of CoA in adult patients presents different challenges to those encountered in infants. As the treatment of CoA has progressed, a range of treatments can result in excellent outcome if each patient s individual circumstances (such as repeat operation, aneurysm formation, large collaterals, and cardiovascular pathology) are carefully considered preoperatively. As the number of cases included in this study is small, further research is necessary to establish the optimal treatment for CoA in adolescents and adults in the future. Disclosure Statement The authors declare no conflicts of interest. References 1) Pádua LM, Garcia LC, Rubira CJ, et al. Stent placement versus surgery for coarctation of the thoracic aorta. Cochrane Database Syst Rev 2012; 5: CD ) Ringel RE, Gauvreau K, Moses H, et al. Coarctation of the Aorta Stent Trial (COAST): study design and rationale. Am Heart J 2012; 164: ) Smith Maia MM, Cortês TM, Parga JR, et al. Evolutional aspects of children and adolescents with surgically corrected aortic coarctation: clinical, echocardiographic, and magnetic resonance image analysis of 113 patients. J Thorac Cardiovasc Surg 2004; 127: ) Cohen M, Fuster V, Steele PM, et al. Coarctation of the aorta. Long-term follow-up and prediction of outcome after surgical correction. Circulation 1989; 80: ) Roselli EE, Qureshi A, Idrees J, et al. Open, hybrid, and endovascular treatment for aortic coarctation and postrepair aneurysm in adolescents and adults. Ann Thorac Surg 2012; 94: 751-6; discussion ) Kouchoukos NT, Scharff JR, Castner CF. Repair of primary or complicated aortic coarctation in the adult with cardiopulmonary bypass and hypothermic circulatory arrest. J Thorac Cardiovasc Surg 2015; 149: S ) Yousif A, Kloppenburg G, Morshuis WJ, et al. Repair of adult aortic coarctation by resection and interposition grafting. Interact Cardiovasc Thorac Surg 2016; 23: ) Backer CL, Stewart RD, Kelle AM, et al. Use of partial cardiopulmonary bypass for coarctation repair through a left thoracotomy in children without collaterals. Ann Thorac Surg 2006; 82: ) Crafoord C, Nylin G. Congenital coarctation of the aorta and its surgical treatment. J Thorac Surg 1945; 14: 347. Ann Thorac Cardiovasc Surg Vol. 24, No. 2 (2018) 101
6 Nakamura E, et al. 10) Bouchart F, Dubar A, Tabley A, et al. Coarctation of the aorta in adults: surgical results and long-term follow-up. Ann Thorac Surg 2000; 70: ; discussion ) Sandrio S, Karck M, Gorenflo M, et al. Results of using cardiopulmonary bypass for spinal cord protection during surgical repair of complex aortic coarctation. Cardiol Young 2014; 24: ) Gross RE. Treatment of certain aortic coarctations by homologous grafts; a report of nineteen cases. Ann Surg. 1951; 134: ) Massey R, Shore DF. Surgery for complex coarctation of the aorta. Int J Cardiol 2004; 97: ) Donahoo JS, Brawley RK, Gott VL. The heparincoated vascular shunt for thoracic aortic and great vessel procedures: a ten-year experience. Ann Thorac Surg 1977; 23: ) Alexander JC. Maintenance of distal aortic perfusion by a heparin-bonded shunt during repair of coarctation of the aorta with minimal collateral circulation. Ann Thorac Surg 1981; 32: ) Pennington DG, Dennis HM, Swartz MT, et al. Repair of aortic coarctation in infants: experience with an intraluminal shunt. Ann Thorac Surg 1985; 40: ) Yamashita K, Suzuki K, Terada H, et al. Surgical treatment for isolated coarctation of the aorta in an adult patient. Gen Thorac Cardiovasc Surg 2008; 56: ) Elkerdany A, Hassouna A, Elsayegh T, et al. Left subclavian-aortic bypass grafting in primary isolated adult coarctation. Cardiovasc Surg 1999; 7: ) Levy Praschker BG, Mordant P, Barreda E, et al. Long-term results of ascending aorta-abdominal aorta extra-anatomic bypass for recoarctation in adults with 27-year follow-up. Eur J Cardiothorac Surg 2008; 34: ) Mesnildrey P, Pavie A, Mussat T, et al. [Isthmic coarctation of the aorta: characteristics and results of surgical treatment in subjects surgically-treated after 35 years of age]. Arch Mal Coeur Vaiss 1984; 77: ) Yu Z, Wu S, Li C, et al. One stage surgical treatment of aortic valve disease and aortic coarctation with aortic bypass grafting through the diaphragm and aortic valve replacement. J Cardiothorac Surg 2015; 10: ) Duvan I, Ates MS, Onuk BE, et al. Single stage repair for aortic coarctation associated with intracardiac defects using extra-anatomic bypass graft in adults. Korean Circ J 2016; 46: ) Singer MI, Rowen M, Dorsey TJ. Transluminal aortic balloon angioplasty for coarctation of the aorta in the newborn. Am Heart J 1982; 103: ) Vergales JE, Gangemi JJ, Rhueban KS, et al. Coarctation of the aorta - the current state of surgical and transcatheter therapies. Curr Cardiol Rev 2013; 9: Ann Thorac Cardiovasc Surg Vol. 24, No. 2 (2018)
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