![]() In type C, which is the rarest type, the interruption is between the innominate and left carotid arteries. In the most common type B, the interruption is between the left common carotid and left subclavian artery. In type A, the interruption is distal to the left subclavian artery. They classified this lesion into three types, based on the site of aortic arch interruption. ![]() The types of IAA were described by Celoria and Patten. IAA is defined as either a complete discontinuity or a nonpatent fibrous strand in the transverse arch or aortic isthmus. However, in some series type B was more common even in presence of TA. A higher incidence of type A morphology (62.5%) could be found in patients with associated truncus arteriosus (TA). Most reports highlight type B morphology as the most common form (52–90%). IAA with ventricular septal defect (VSD) is an uncommon lesion, accounting for 1.5% of all congenital heart disease. Although operative survival has improved in recent years, further interventions are often required to address residual or recurrent left heart outflow or residual arch obstructions. įactors contributing to improved results in recent years include accumulated surgical experience, the care of patients with congenital heart diseases centralised into major centres, antenatal diagnosis, better stabilisation and treatment of all complications before definitive repair. Untreated, the median age at death was 4–10 days, usually following physiological closure of the ductus arteriosus. Interrupted aortic arch (IAA) was described by Steidele in 1778 and is now defined as an uncommon congenital cardiovascular malformation characterised by the lack of luminal continuity between the ascending and descending thoracic aorta. Congenital heart disease, Aorta, Interrupted aortic arch, Associated anomalies 1 Introduction
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