To further clarify the diagnosis, thoracic and abdominal computed tomography angiography (CTA) was performed, which showed that the aortic arch and descending aorta were discontinuous, and the disconnection was located at the distal to the left subclavian artery (type A IAA) (Figure (Figure1A). The flow of the abdominal aorta showed a small slow wave.Ībdominal computed tomography (CT) examination revealed multiple tortuous vascular shadows in the paravertebral column and bilateral chest wall areas. The aortic arch and the distal to the left subclavian artery were discontinuous, and numerous collateral branches existed around the descending aorta. Color Doppler echocardiography displayed a normal right atrium and right ventricle, and an enlarged left atrium and left ventricle. To investigate if there are any difference and similarity between adult type A IAA and CoA, cases of both types were reported in this study.Ĭase 1: Electrocardiogram (ECG) showed complete right bundle branch block and T wave change. Coarctation of the aorta (CoA) is defined as a discrete stenosis of the aorta usually located in the area of the ligamentum arteriosum, with a higher incidence of 6%-8% than IAA. Type A accounts for approximately 79% of adult IAA cases, without the complications associated with type B such as ventricular septal defects and patent ductus arteriosus. According to the location of the dissection, it is divided into three types: The dissection located at the distal to the left subclavian artery origin (type A) that located between the left common carotid artery and the left subclavian artery (type B) and that between the brachiocephalic trunk and the left common carotid artery (type C). Interrupted aortic arch (IAA) is a congenital malformation disease with loss of continuity between the aortic arch and descending aorta, accounting for about 1% of congenital heart diseases.
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