Prenatal diagnosis of isolated coronary arteriovenous fistula

Article information

Obstet Gynecol Sci. 2018;61(1):161-164
Publication date (electronic) : 2017 December 28
doi : https://doi.org/10.5468/ogs.2018.61.1.161
1Department of Obstetrics and Gynecology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
2Division of Neonatology, Department of Pediatrics, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
3Department of Diagnostic Imaging, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
4Department of Pediatric Cardiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
5Division of Pediatric Cardiac Surgery, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
Corresponding author: Mi-Young Lee. Department of Obstetrics and Gynecology, University of Ulsan College of Medicine, Asan Medical Center, 88 Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Korea. poptwinkle@hanmail.net
Received 2017 May 31; Revised 2017 July 20; Accepted 2017 July 20.

Abstract

Coronary arteriovenous fistula (CAVF) is a rare condition defined as an anomalous termination of the coronary arteries. The etiology of CAVF is either congenital or acquired, and iatrogenic CAVF is most commonly caused by cardiovascular surgery or percutaneous intervention. Most of the prenatally diagnosed CAVFs were related to complex heart disease, and only few cases of an isolated CAVF have been reported to date. We successfully diagnosed an isolated CAVF by fetal echocardiography at 25.3 weeks of gestation. Accurate prenatal diagnosis resulted in the prompt decision for postnatal surgical correction, and the neonate thrived well without any complications.

Introduction

Coronary arteriovenous fistula (CAVF) is defined as an abnormal fistulous connection between a coronary artery and any of the 4 chambers. This condition is rare, accounting for 0.002% of the general population [1]. The most common type of CAVF is a fistulous communication between the coronary artery and cardiac chambers (75%), followed by the pulmonary artery (17%), coronary sinus (7%), and superior vena cava (1%) [1]. Prenatal diagnosis of CAVF has been reported since 1996 [2], and a majority of the prenatally diagnosed CAVFs are associated with outflow tract obstructive lesions with an intact ventricular septum, such as pulmonary atresia and hypoplastic left heart syndrome [23]. However, few cases of isolated CAVF have been reported to date. We successfully diagnosed the fistula between the left coronary artery and coronary sinus by prenatal echocardiography. To the best of our knowledge, this is the first report of a prenatally diagnosed fistula between the left coronary artery and coronary sinus.

Case report

A 23-year-old woman, gravida 1, para 0, was referred to our institution for a detailed cardiovascular evaluation for hypoplastic left heart syndrome at 25.3 weeks of gestation. Her medical and family histories were unremarkable. Initial fetal echocardiography demonstrated situs solitus with atrioventricular and ventricular arterial concordance. A 4-chamber view of the heart revealed mild dilatation of the right atrium and right ventricle without tricuspid regurgitation. In the 5-chamber view, the left coronary artery was dilated and directly connected to the coronary sinus (Fig. 1A). Power Doppler sonography confirmed the presence of the fistula between the left coronary artery and coronary sinus (Fig. 1B); thus, the diagnosis of a CAVF was made. A relatively small aorta was observed after branching of the left coronary artery without any obstruction signs, and color Doppler showed reversal flows in the ascending aorta and aortic arch during the diastolic phase. No other abnormalities were detected, and the parent refused fetal karyotyping.

Fig. 1

The 5-chamber view of the heart at 25.3 weeks showing the fistula between the left coronary artery and coronary sinus (arrow, A). Power Doppler imaging confirming the communication between the left coronary artery and coronary sinus (B). The 4-chamber view of the heart at 29.6 weeks showing the dilated coronary sinus (arrow) with the collapsed left atrium (C).

Ao, aorta; CS, coronary sinus; LA, left atrium; LV, left ventricle; RA, right atrium; RV, right ventricle.

Follow-up echocardiography at 29.3, 33.5, and 36.5 weeks of gestation revealed that the CAVF was more obvious and the coronary sinus had become dilated, inducing compression of the left atrium (Fig. 1C). There were no signs of cardiac impairment during the prenatal period. A female neonate was born at 39.4 weeks of gestation. The birth weight was 3.24 kg and the Apgar scores were 9 and 9 at 1 and 5 minutes, respectively.

Immediately after delivery, the neonate was stable with a heart rate of 170 bpm, and oxygen saturation of 100% at room air. Postnatal echocardiography and cardiac computed tomography showed the dilated left main coronary and left circumflex arteries with a fistulous connection to the severely dilated coronary sinus (Fig. 2). The aorta was unobstructed, with no evidence of coarctation of aorta. Electrocardiography showed ST changes in the whole precordial leads, suggesting myocardial ischemia, and cardiac catheterization was performed for a trial of catheter intervention. Angiography also showed findings similar to those of the postnatal echocardiography. However, catheter intervention could not be performed because of a very large fistula tract. On the third day of life, the neonate underwent surgical repair for CAVF coupled with ligation of the ductus arteriosus and closure of the atrial septal defect. Subglottic stenosis occurred postoperatively and was successfully treated by laser dissection. She was discharged after 2 months of hospitalization. Currently, at the age of 1 year, the baby is doing well without any complications.

Fig. 2

Postnatal computed tomography showing the dilated left circumflex artery draining into the enlarged coronary sinus on the axial image (arrow, A) and the 3-dimensional volume rendering image (arrow, B).

Ao, aorta; CS, coronary sinus; LAA, left atrial appendage; LCX, left circumflex coronary artery; LMA, left main coronary artery; PA, pulmonary artery.

Discussion

To the best of our knowledge, this is the first report of a fistula between the left coronary artery and coronary sinus successfully diagnosed by prenatal echocardiography. To date, few cases of isolated CAVF have been diagnosed prenatally [4567891011]. All isolated CAVFs that were diagnosed prenatally drained into the cardiac chambers, and there were no cases with connections to the vascular structures rather than the cardiac chambers, such as the pulmonary artery, coronary sinus, and superior vena cava. In our case, prenatal ultrasonography was sensitive enough to diagnose CAVF draining into the coronary sinus.

Although the normal coronary artery is usually difficult to visualize prenatally because of the small size of the vessel, coronary malformations, such as CAVF, can be diagnosed with a high accuracy by fetal echocardiography. In this case, we clearly demonstrated the fistulous tract connected to the dilated coronary sinus. When the echocardiographic findings, such as cardiomegaly, dilated coronary artery, and abnormal jet flow into the cardiac chambers or great vessels that the CAVF enters, are obtained prenatally, a CAVF should be suspected [9]. We also observed reversal flows in the ascending aorta and aortic arch, and these findings were considered to be a coronary “steal phenomenon” because of the runoff of blood from the high-pressure coronary arteries to a low-resistance draining cavity [12].

Most infants with CAVF are generally asymptomatic. However, a majority of the patients with prenatally diagnosed CAVFs showed symptoms related to congestive heart failure; therefore, they underwent closure of the fistula. There was only one case of spontaneous closure of a prenatally diagnosed CAVF. Based on these findings, it is speculated that patients with prenatally diagnosed CAVFs are more likely to experience congestive heart failure than those of with postnatally diagnosed fistulas. CAVF may cause heart failure during the prenatal period, resulting in fetal hydrops. Two cases of CAVF associated with fetal hydrops were reported, and both neonates died on the day of delivery [78].

Symptomatic patients should be treated by either percutaneous or surgical closure. Surgical closure is generally accepted in cases of large symptomatic fistulas or fistulas complicated by other cardiac defects [13]. In our case, the retrograde flow in the ascending aorta detected by prenatal and postnatal echocardiography and widespread ST changes on electrocardiography suggested a significant steal phenomenon, and progressive elevated B-type natriuretic peptide suggested a large shunt flow from the fistula and the patent ductus arteriosus. These findings indicated early surgical correction. The neonate in this case underwent a surgical correction on the third day after birth without any complications. The prenatal detection of CAVF is of importance for the appropriate treatment and prevention of complications.

In conclusion, we reported an extremely rare case of abnormal vascular connections involving the left circumflex coronary artery and coronary sinus. A careful echocardiographic examination in the prenatal period is applicable for the diagnosis of a CAVF and aids its timely management.

Notes

Conflict of interest: No potential conflict of interest relevant to this article was reported.

References

1. Schumacher G, Roithmaier A, Lorenz HP, Meisner H, Sauer U, Müller KD, et al. Congenital coronary artery fistula in infancy and childhood: diagnostic and therapeutic aspects. Thorac Cardiovasc Surg 1997;45:287–294. 9477461.
2. Chaoui R, Tennstedt C, Göldner B, Bollmann R. Prenatal diagnosis of ventriculo-coronary communications in a second-trimester fetus using transvaginal and transabdominal color Doppler sonography. Ultrasound Obstet Gynecol 1997;9:194–197. 9165683.
3. Chaoui R, Tennstedt C, Göldner B. Prenatal diagnosis of ventriculocoronary arterial fistula in a fetus with hypoplastic left heart syndrome and aortic atresia. Ultrasound Obstet Gynecol 2002;20:75–78. 12100423.
4. Nagiub M, Mahadin D, Gowda S, Aggarwal S. Prenatal diagnosis of coronary artery fistula: a case report and review of literature. AJP Rep 2014;4:e83–e86. 25452888.
5. Hayashi G, Inamura N, Kayatani F, Kawazu Y, Hamamichi Y, Hisaaki A. Prenatal diagnosis of a left coronary artery to left atrial fistula. Prenat Diagn 2012;32:194–196. 22418965.
6. Matsumoto Y, Hoashi T, Kagisaki K, Ichikawa H. Successful surgical treatment of a gigantic congenital coronary artery fistula immediately after birth. Interact Cardiovasc Thorac Surg 2012;15:520–522. 22645295.
7. Cetiner N, Altunyuva Usta S, Akalın F. Coronary arteriovenous fistula causing hydrops fetalis. Case Rep Obstet Gynecol 2014;2014:487281. 25247099.
8. Oztunc F, Gokalp S, Yuksel MA, Imamoglu M, Madazli R. Prenatal diagnosis of left coronary artery to right ventricle fistula. J Clin Ultrasound 2015;43:129–131. 25042857.
9. Sharland GK, Konta L, Qureshi SA. Prenatal diagnosis of isolated coronary artery fistulas: progression and outcome in five cases. Cardiol Young 2016;26:915–920. 26381209.
10. Zeng S, Zhou Q, Tian L, Zhou J, Zhang M, Cao D. Isolated coronary artery fistula in fetal heart: case reports and literature review. Fetal Pediatr Pathol 2016;35:348–352. 27362857.
11. Kaldararova M, Tittel P, Zahorec M. Giant coronary artery fistula: prenatal diagnosis, newborn manifestation. Rev Esp Cardiol (Engl Ed) 2016;69:1100. 27178116.
12. Challoumas D, Pericleous A, Dimitrakaki IA, Danelatos C, Dimitrakakis G. Coronary arteriovenous fistulae: a review. Int J Angiol 2014;23:1–10. 24940026.
13. Said SA, Lam J, van der Werf T. Solitary coronary artery fistulas: a congenital anomaly in children and adults. A contemporary review. Congenit Heart Dis 2006;1:63–76. 18377549.

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Fig. 1

The 5-chamber view of the heart at 25.3 weeks showing the fistula between the left coronary artery and coronary sinus (arrow, A). Power Doppler imaging confirming the communication between the left coronary artery and coronary sinus (B). The 4-chamber view of the heart at 29.6 weeks showing the dilated coronary sinus (arrow) with the collapsed left atrium (C).

Ao, aorta; CS, coronary sinus; LA, left atrium; LV, left ventricle; RA, right atrium; RV, right ventricle.

Fig. 2

Postnatal computed tomography showing the dilated left circumflex artery draining into the enlarged coronary sinus on the axial image (arrow, A) and the 3-dimensional volume rendering image (arrow, B).

Ao, aorta; CS, coronary sinus; LAA, left atrial appendage; LCX, left circumflex coronary artery; LMA, left main coronary artery; PA, pulmonary artery.