216 Turk Kardiyol Dern Ars 2018;46(3):216-220 doi: 10.5543/tkda.2017.98047

CASE REPORT / OLGU SUNUMU

Case report and the surgical treatment of two cases with pulmonary atresia in which pulmonary are perfused by coronary arteries

Pulmoner arter kanlanması koroner arterler yoluyla olan pulmoner atrezili iki olgu sunumu ve cerrahi tedavisi

Kahraman Yakut, M.D.,1 Kürşad Tokel, M.D.,1 Birgül Varan, M.D.,1 İlkay Erdoğan, M.D.,1 Murat Özkan, M.D.2

1Department of Pediatric , Başkent University Faculty of , Ankara, Turkey 2Department of Cardiovascular , Başkent University Faculty of Medicine, Ankara, Turkey

Summary– Pulmonary atresia (PA) and ventricular septal Özet– Pulmoner atrezi (PA), ventriküler septal defekt (VSD) defect (VSD) can occur in a variety of ways, from simple ile birlikte basit bir kapak atrezisinden, akciğer yatağının valve atresia to a condition in which circulation to the pul- aortadan ayrılan kollateral arterler ile kanlandığı gerçek monary bed occurs through collateral arteries separated pulmoner arterlerin bulunmadığı veya ağır hipoplazik ol- from the and there are no real pulmonary arteries, or duğu tabloya kadar çok geniş spektrum halinde görülebil- they are present but hypoplastic. The size of the pulmonary mektedir. Pulmoner arterin ve dallarının boyutu ile birlikte arteries and concomitant complex cardiac lesions are impor- eşlik eden diğer karmaşık kalp lezyonlarının varlığı tedavi tant in making decisions about treatment and correctional yönteminde ve tüm düzeltme seçeneklerinin belirlenme- alternatives. While complete correction in the style sinde önemlidir. Basit formlarında Fallot tetralojisi onarımı of a correction of are performed in simpler tarzında tam düzeltme ameliyatı yapılırken, spektrumun di- cases, many very invasive procedures are also performed ğer ucundaki hastalarda çok sayıda girişim gerekmekte ve and the resulting quality of life is very variable. The size of yaşam kalitesi oldukça değişken olmaktadır. Pulmoner arter the pulmonary and its branches and the presence of ve dallarının boyutu, eşlik eden kollateral arterlerin varlığı accompanying collateral vessels are determining factors in tedavi yönetiminde belirleyicidir. Burada ilk olgu 40 günlük, the management of the disease. In this report, 2 cases of ikinci olgu iki günlük iken muayene sırasında üfürüm fark VSD and PA, in which the circulation of the pulmonary arter- ies was through the coronary arteries, diagnosed as a result edilmesi üzerine yapılan ekokardiyografik incelemede VSD, of performed following murmurs heard pulmoner atrezi tanısı konmuş olan ve pulmoner arterlerin during examination, are described. The first patient was 40 koroner arter aracılığı ile kanlanmasının sağlandığı iki olgu- days old and the second was 2 days old. In the second case, yu sunmak istedik. İkinci olgumuzda tanı kateter anjiyografi diagnosis was confirmed by catheter angiography, and in ile kesinleşti. İlk olgumuzda ancak cerrahi sırasında kesin the first case, the final diagnosis was made during surgery. tanı konulabildi. Bu çalışmayı sunmaktaki amacımız pul- The aim of this report is to emphasize the importance of pul- moner atrezili hastalarda pulmoner arter boyutu, pulmoner monary artery size, the presence of pulmonary confluence, konfluansın varlığı, kanlanmasının nereden sağlandığı ve the origin of circulation, and concomitant collateral arteries eşlik eden kollateral arterlerin tedavi yönetimindeki önemini when considering treatment methods. vurgulamaktır.

ulmonary atresia (PA) is a complex congenital problematic issue, satisfac- Abbreviations: Pheart disease with very variable morphological tory results can be obtained MAPCA Major aortopulmonary characteristics which may be seen in association with using materials provided by collateral artery ventricular septal defect (VSD) or intact ventricular developing technological PA Pulmonary atresia VSD Ventricular septal defect septum.[1–3] In congenital diseases associated facilities, and novel surgical with PA surgical treatment still continues to be a techniques. If PAs are hypoplastic, palliative interven-

Received: March 31, 2017 Accepted: August 21, 2017 Correspondence: Dr. Kahraman Yakut. Başkent Üniversitesi Tıp Fakültesi, Çocuk Kardiyoloji Bilim Dalı, Ankara. Tel: +90 312 - 203 68 68 / 1382 e-mail: e-posta: [email protected] © 2018 Turkish Society of Cardiology Case reportof pulmonary circulation by 217 tions which will allow the development of PA so as to old male patient at another center, heart murmurs permit conduction of complete correction surgeries as were heard. On echocardiographic examination, he soon as possible. With palliative methods it is possible received diagnoses of PA, VSD, and major aortopul- to gain time for the development of , monary collateral artery (MAPCA) so he was sent and its branches, and perform complete correction to our clinic. When he was 10-month old, catheter surgeries at a later time. Although debates concern- angiography was performed preoperatively to eval- ing the most optimal surgical approach still continue, uate main pulmonary artery, right, and left branches with increasing information, more comforable life of pulmonary arteries, and collateral arteries. On an- is ensured for the patients. When diagnosis of PA is giography, a pulmonary artery arising from ventricles established, echocardiography, catheter angiography, was not detected, while a collateral artery stemming and in case of need, computed tomography are impor- from aortic root perfused pulmonary artery, Besides, tant imaging modalities in determining dimensions of common pulmonary artery, right, and left branches of pulmonary artery, and its branches, presence of con- pulmonary arteries had smaller calibres. Origins, and fluence (if any), source of its blood supply,- dimen courses of right, and left coronary arteries were not sions, and location of the associated aortopulmonary anomalous, and two MACPAs which were not related collaterals, in specification of surgical, and interven- to pulmonary arteries, and their branches but deliv- tional treatment methods, and decreasing postopera- ered contrast substance to the vascular beds of right, tive morbidity, and mortality. Developments in diag- and left coronary arteries were detected. The patient nostic, and interventional methods, novel materials was brought into the operating room with the decision offered by technological facilities, accumulation of to perform left Blalock-Taussig (BT) shunt. During information about treatment modalities contribute surgery, it was determined that common pulmonary significantly to survival time, and quality of life of artery was not perfused by a collateral artery stem- the patients. ming from the aortic root, but its blood supply was provided by a tortuous collateral artery arising from In this article we aimed to present rarely seen two the right coronary artery (Fig. 1a, b – Video 1, 2*). cases with PA together with their surgical treatment Besides two MAPCAs unrelated to pulmonary artery, whose pulmonary arterial perfusion was provided and its branches, delivered blood to the Mod- through coronary arteries. ified BT shunt was performed between left brachio- CASE REPORT cephalic artery, and left pulmonary artery. Collateral artery stemming from the right coronary artery was Case 1– During routine examination of a 2-month- closed.

A B

Figure 1. (A) Angiogram demonstrating blood circulation of the main pulmonary artery provided by a tortuous collateral vessel stemming from the right coronary artery. (B) Intraoperative view of the blood circulation of the main pulmonary artery provided by a tortuous collateral vessel stemming from right coronary artery. 218 Turk Kardiyol Dern Ars

In addition, two MAPCAs unrelated to pulmonary rial bed, and these MAPCAs were not associated with artery, and its branches, and unfit for unifocalization conflent pulmonary arteries. The patient underwent were also closed. Cardiac output of the patient who Sano shunt when it was 8-month-old, and collateral was monitorized in the intensive care unit decreased vessel between the right coronary artery, and pul- on postoperative 2. day, and the patient exited the next monary artery was closed intraoperatively. day. Since in this case peripheral pulmonary arterial bed Case 2– A 2-day-old newborn who had undergone was hypoplastic, MAPCAs were not closed with the echocardiographic examination at another center be- intention to unifocalize them at a later date. Because cause of heart murmurs heard during its PE which of stenosis of outlet of the Sano shunt developed when necessitated catheter angiography due to persistently the patient was 2 years of age, previously placed graft low oxygen saturation. The baby was referred to our was replaced. Catheter angiographies performed dur- center with the diagnoses of pulmonary atresia, VSD, ing follow-up period revealed that pulmonary arterial and MAPCA for surgical intervention. The patient bed, and collateral arteries did not develop adequately was referred to our clinic when it was 5-month-old, for complete correction surgery (Fig. 2a, b). and underwent preoperative angiographic examina- tion to determine, and evaluate the development, and DISCUSSION the source of blood supply of main pulmonary artery, Though considered as a term defining only pulmonary right, and left pulmonary arteries. On angiograms, valvular , pulmonary atresia also demon- any evidence suggesting pulmonary artery originat- strates its effects on all cardiac structures mainly left ing from ventricles was not observed, and also main . In VSD patients with PA, very variable pul- pulmonary artery, right-left pulmonary arteries were monary artery circulation, and anatomy are the most hypoplastic. Blood supply of pulmonary artery was effective determinant of natural course of this pathol- provided by a collateral artery arising from the right ogy, and treatment approach. Pulmonary circulation coronary artery which communicated with the main can be achieved with patent , and pulmonary artery in the supraclavicular region. Be- collaterals between coronary, and pulmonary arteries. sides MAPCAs delivered blood into pulmonary arte- Size of pulmonary artery, and its branches, presence

Figure 2. (A) Catheter angiogram demonstrating inadequately developed pulmonary arterial bed for complete correction, and unifocalization surgeries, and two collateral arteries stemming from aorta. (B) Catheter angiogram demonstrating inadequately developed pulmonary arterial bed for complete correction, and unifocalization surg- eries, and two collateral arteries stemming from aorta. Case reportof pulmonary circulation by 219 of confluence, and suitability of collaterals for unifo- pulmonary artery segments should communicate with calization are important factors in the preference for the right ventricle, and central pulmonary artery di- complete correction or palliative surgeries.[1–3] Post- ameter should be ≥50% wider than normal. In our operative survival, and morbidity may be related to Case 1, since pulmonary arterial bed was adequate, the size of the remaining collaterals, and closure or and collateral arteries were not suitable for unifocal- unifocalization of these collaterals may be required ization, two collateral arteries were closed during op- before, and after surgery. Therefore in these patients eration. In our Case 2, pulmonary arterial bed was hy- confluence, and diameters of pulmonary arteries, lo- poplastic. Inadequacy of pulmonary arterial bed was cation, and clinical significance of collaterals should predicted, so development of artery was awaited for be determined using echocardiography, and catheter unifocalization procedure. Many centers do not pre- angiography. In our two cases, preoperatively, fer shunting in newborns, and infants, however it has catheter angiography was performed. Angiography been reported that so as to achieve forward blood flow report of Case 1, indicated that pulmonary artery into pulmonary arteries at an early age, interposing was perfused from a collateral vessel stemming from 6–8 mm-wide homografts between the right ventricle, a point near aortic root. However during surgery it and pulmonary artery may further contribute to the was determined that blood circulation of pulmonary development of pulmonary arterial bed. In our Case 2, artery was provided by a collateral artery stemming we preferred Sano shunt based on the prediction that from right coronary artery. Angiography of Case 2, hypoplastic precapillary pulmonary arterial bed might could demonstrate that pulmonary arterial circulation develop faster with forward blood flow. was provided by a tortuous artery originating from coronary artery. Preoperative identification of the ori- In cases with VSD, pulmonary atresia, dimensions gin of these collaterals both increases success rate of of pulmonary artery, and its branches are the most im- surgery, and also shortens operative time. Although portant entities which determine the applicability of in our Case 1 any relationship between collaterals, complete correction surgeries. Therefore adequacy of and coronary arteries was not detected preoperatively, diameters of these vessels, and their branches should demonstration of collaterals stemming from a point be evaluated using echocardiography, and angiogra- [1,2,6,7] near aortic root guided the surgical team. phy. Since pulmonary arteries, and their branches are hypoplastic, complete correction surgery could In VSD patients with pulmonary atresia, pul- not be performed in both of our cases. As a palliative monary perfusion is entirely dependent on systemic treatment, modified BT shunt was preferred in Case 1, circulation. Blood circulation of pulmonary artery is and Sano shunt in Case 2. provided by MAPCAs mostly originating from aorta or ductus arteriosus. Pulmonary artery circulation Conclusion is rarely provided by coronary arteries or plexuses In patients with VSD and pulmonary atresia, de- formed by bronchial collateral arteries. Collateral ar- termination of dimensions, perfusion capability, pres- teries mostly stem from aorta. Since collateral arteries ence, and origin of collateral arteries is important for may rarely stem from coronary arteries, as was seen in the treatment, and prognosis. When performing imag- our cases, aortography which also visualizes coronary ing studies, it should not be forgotten that though col- arteries is recommended.[4,5] lateral arteries may rarely stem from coronary arteries, While planning complete correction or palliative ascending aorta together with coronary arteries should shunt surgeries, preoperative identification of large be evaluated during these radiological examinations. collaterals which might cause excess blood flow, and *Complementary video file of this article can be determination of their clinical importance are neces- found in online version of the journal. sary prerequisites for decreasing rates of morbidity, and mortality.[1–3,6,7] In both of our cases collateral ar- Peer-review: Externally, and independent. teries arising from descending aorta, and delivering Informed consent: Written, and undersigned informed blood into lungs were angiographically demonstrated. consent forms were obtained from the parents of the pa- It has been reported that for achievement of an im- tients related to the publication of the case, and relevant proved quality of life of the patients, at least 14–15 images. 220 Turk Kardiyol Dern Ars

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