Vascular Ring, Double Aortic Arch 

  • Author: Doff B McElhinney, MD; Chief Editor: Stuart Berger, MD   more...
 
Updated: Oct 29, 2009
 

Background

Double aortic arch is one of the 2 most common forms of vascular ring, a class of congenital anomalies of the aortic arch system in which the trachea and esophagus are completely encircled by connected segments of the aortic arch and its branches. Although the double aortic arch has various forms, the common defining feature is that both the left and right aortic arches are present.

Embryology

The easiest way to understand the anatomy and development of double aortic arch and other forms of vascular ring is to begin by considering the bilateral system of pharyngeal arch vessels in the early embryo.

Early in the course of embryonic morphogenesis, 6 pairs of pharyngeal arch arteries develop in conjunction with the branchial pouches. The first through sixth arches appear in a fairly sequential fashion, with left-to-right symmetry, and constitute the primitive vascular supply to the brachiocephalic structures, running from the aortic sac to the paired dorsal aortas. As normal cardiovascular morphogenesis proceeds, a patterned regression and persistence of the various arches and right-sided dorsal aorta occur, ultimately resulting in the mature configuration of the thoracic aorta and its branches. The third, fourth, and sixth arches, along with the seventh intersegmental arteries and the left dorsal aorta, are the primary contributors to the normal aortic arch and its major thoracic branches (see diagram below).

Schematic diagram (left) of the primitive pharyngeSchematic diagram (left) of the primitive pharyngeal arch system shows the left (L) and right (R) external carotid (EC) and internal carotid (IC) arteries, fourth (IV) and sixth (VI) pharyngeal arches, distal pulmonary arterial segments (PA), dorsal aortas (DA), and seventh intersegmental arteries (VII). The proximal (p) sixth arches develop into the proximal pulmonary arteries and the distal (d) sixth arches become the arterial ducts. The seventh intersegmental arteries develop into the subclavian arteries. Schematic diagram (right) shows the segments of the pharyngeal arch system that regress (shown in black) in the normal formation of the thoracic great arteries. Left pulmonary artery (LPA); ductus arteriosus (PDA); right pulmonary artery (RPA); subclavian artery (SCA).

The segments of the bilateral aortic arch system that normally regress include the distal portion of the sixth arch and the right-sided dorsal aorta. Normally, the left fourth arch becomes the aortic arch, the right fourth arch contributes to the innominate artery, the distal left sixth arch becomes the ductus arteriosus, the proximal sixth arches bilaterally contribute to the proximal branch pulmonary arteries, the left dorsal aorta becomes the descending thoracic aorta, and the dorsal intersegmental arteries bilaterally become the subclavian arteries.

Vascular rings are formed when this process of regression and persistence does not occur normally, and the resulting vascular anatomy completely encircles the trachea and esophagus. (Other forms of aortic arch anomalies occur in which a vascular ring is not present.) A double aortic arch is formed when both fourth arches and both dorsal aortas remain present.

Anatomy

Double aortic arch has various forms. Both arches may be patent, or an atretic (but persistent) segment may be present at one of several locations in either arch. When both arches are patent, the right or left arch may be larger, or they may be similar in size. A cervical arch on either side, variable laterality of the descending thoracic aorta, coarctation of the major arch, and/or discontinuity of the central pulmonary arteries may be present. In general, the apex of the right-sided arch is more superior than the left arch, and on occasion, a cervical arch may be present on either side.

In more than 75% of patients with double aortic arch, the right arch is dominant. Among patients with a right-dominant double arch, those with a patent minor arch outnumber those with an atretic minor arch. When the minor arch is atretic, the atretic segment almost always is distal to the left subclavian artery, although atresia may also occur between the left common carotid and subclavian arteries. In approximately 20% of patients, the left arch is dominant. In these patients, the minor right arch is typically patent.

Associated cardiovascular anomalies

Double aortic arch usually occurs without associated cardiovascular anomalies. Ventricular septal defect and tetralogy of Fallot are probably the most common associated defects, although truncus arteriosus, transposition of the great arteries, pulmonary atresia, and complex univentricular defects sometimes occur in conjunction with a double arch.

Associated syndromes and noncardiac conditions

Double aortic arch is associated with a chromosome band 22q11 deletion in approximately 20% of patients (see Causes). Band 22q11 deletion is responsible for DiGeorge, velocardiofacial, and conotruncal anomaly face syndromes, which are often referred to using the unified terms CATCH-22 syndrome or chromosome band 22q11 deletion syndrome. In patients with double aortic arch, the frequency of phenotypes satisfying the clinical criteria for these various syndromes is not known. Rather, the important point is that double aortic arch may be associated with band 22q11 deletion, which has various other possible manifestations. These include, but are not limited to, palatal abnormalities, laryngotracheal anomalies, speech and learning delay, characteristic facial features, hypocalcemia, abnormalities of T-cell–mediated immune function, and neurologic defects.

Occasionally, patients with double aortic arch may have anomalies consistent with either vertebral, anal, cardiac, tracheal, esophageal, renal, and limb (VACTERL) or posterior coloboma, heart defect, choanal atresia, retardation, genital, and ear (CHARGE) associations. Double aortic arch has also been reported in association with other chromosomal anomalies, such as trisomy 21 and other syndromes.

One of the more important noncardiac features that sometimes is found in association with double aortic arch is esophageal atresia, insofar as an undiagnosed arch anomaly may complicate repair of the esophageal atresia, which is usually recognized earlier than the double aortic arch.

Another noncardiac anomaly that may be associated with vascular rings is a congenital laryngeal web, which may present with the same symptoms and signs as a vascular ring. Accordingly, patients with persistent stridor or upper airway obstruction after repair of a vascular ring, particularly those with a chromosome 22q11 deletion, should be evaluated for the presence of a congenital laryngeal web.

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Pathophysiology

By definition, vascular rings encircle the trachea and esophagus, usually causing compression of both structures. Compression of the trachea causes upper airway obstruction that impairs inspiratory and, to a lesser degree, expiratory airflow. The extent of respiratory impairment depends on the severity of compression, which can widely vary. Significant compression of the trachea appears to be more common with double aortic arch than with other forms of vascular ring and is often more severe.

In addition to airway symptoms, patients may experience swallowing difficulties related to esophageal compression. These typically manifest as vomiting and feeding intolerance in infants and younger children and as dysphagia later in life. Swallowing dysfunction may contribute to respiratory symptoms as a result of aspiration and/or compression or irritation of the membranous portion of the trachea as a food bolus traverses the area of esophageal obstruction. Although respiratory or esophageal pathophysiology may predominate in any given patient, respiratory compromise usually is more problematic in younger patients. Patients with primarily esophageal symptomatology tend to be older at presentation. The pathophysiology of double aortic arch does not differ in the various anatomic forms.

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Epidemiology

Frequency

United States

Generally, incidence of double aortic arch and vascular rings is unknown, although vascular rings comprise an estimated 1% of cardiovascular malformations that are managed surgically. In most surgical series, 45-65% of patients undergoing repair of a vascular ring have a double aortic arch.

Mortality/Morbidity

The natural history of double aortic arch is not well defined. Vascular rings were among the first congenital cardiovascular anomalies repaired surgically, and surgical management has been the standard of care for more than 50 years. Patients with significant airway compression may die as a result of respiratory compromise, but such events are rare.

Preoperative morbidity generally is limited to respiratory symptoms, feeding problems, or both. Some patients may develop recurrent respiratory infections, and some may exhibit failure to thrive as the result of a combination of increased metabolic requirements from respiratory and feeding work and relatively poor oral intake.

Other rare complications, such as esophageal erosion and aortoesophageal fistula, have been reported.

Race

Based on limited data, no racial predilection is apparent.

Sex

No sex predilection has been documented in patients with double aortic arch or its various subtypes.

Age

Double aortic arch is a developmental abnormality that is present in the fetus. The postnatal age at which the anomaly is identified may vary, although in most patients, double aortic arch is diagnosed in early infancy. Double aortic arch may also be identified on prenatal ultrasonography.[1]

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Contributor Information and Disclosures
Author

Doff B McElhinney, MD  Assistant Professor of Pediatrics, Harvard Medical School; Associate in Cardiology, Department of Cardiology, Children's Hospital of Boston

Doff B McElhinney, MD is a member of the following medical societies: American Academy of Pediatrics and American College of Cardiology

Disclosure: Nothing to disclose.

Coauthor(s)

Gil Wernovsky, MD, FACC, FAAP  Professor, Department of Pediatrics, University of Pennsylvania, Children's Hospital of Philadelphia

Gil Wernovsky, MD, FACC, FAAP is a member of the following medical societies: American Academy of Pediatrics, American College of Cardiology, and American Heart Association

Disclosure: Nothing to disclose.

Specialty Editor Board

Juan Carlos Alejos, MD  Clinical Professor, Department of Pediatrics, Division of Cardiology, University of California, Los Angeles, David Geffen School of Medicine

Juan Carlos Alejos, MD is a member of the following medical societies: American Academy of Pediatrics, American College of Cardiology, American Heart Association, American Medical Association, and International Society for Heart and Lung Transplantation

Disclosure: Actelion Honoraria Speaking and teaching

Mary L Windle, PharmD  Adjunct Associate Professor, University of Nebraska Medical Center College of Pharmacy; Pharmacy Editor, eMedicine

Disclosure: Nothing to disclose.

Ameeta Martin, MD  Clinical Associate Professor, Department of Pediatric Cardiology, University of Nebraska College of Medicine

Ameeta Martin, MD is a member of the following medical societies: American College of Cardiology

Disclosure: Nothing to disclose.

Gilbert Z Herzberg, MD  Assistant Professor, Department of Pediatrics, Section of Pediatric Cardiology, New York Medical College; Consulting Staff, Department of Pediatrics, Sound Shore Medical Center

Gilbert Z Herzberg, MD is a member of the following medical societies: American Academy of Pediatrics

Disclosure: Nothing to disclose.

Chief Editor

Stuart Berger, MD  Professor of Pediatrics, Division of Cardiology, Medical College of Wisconsin; Chief of Pediatric Cardiology, Medical Director of Pediatric Heart Transplant Program, Medical Director of The Heart Center, Children's Hospital of Wisconsin

Stuart Berger, MD is a member of the following medical societies: American Academy of Pediatrics, American College of Cardiology, American College of Chest Physicians, American Heart Association, and Society for Cardiac Angiography and Interventions

Disclosure: Nothing to disclose.

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Schematic diagram (left) of the primitive pharyngeal arch system shows the left (L) and right (R) external carotid (EC) and internal carotid (IC) arteries, fourth (IV) and sixth (VI) pharyngeal arches, distal pulmonary arterial segments (PA), dorsal aortas (DA), and seventh intersegmental arteries (VII). The proximal (p) sixth arches develop into the proximal pulmonary arteries and the distal (d) sixth arches become the arterial ducts. The seventh intersegmental arteries develop into the subclavian arteries. Schematic diagram (right) shows the segments of the pharyngeal arch system that regress (shown in black) in the normal formation of the thoracic great arteries. Left pulmonary artery (LPA); ductus arteriosus (PDA); right pulmonary artery (RPA); subclavian artery (SCA).
Schematic diagram (left) depicts the segments of the pharyngeal arch system that regress (shown in black) so that the mature vascular anatomy of a double aortic arch can develop. The dominant and minor arches can vary in laterality and specific patterns of branching and segmental hypoplasia/atresia. (These variables are not specified in this diagram.) Left (L) and right (R) external carotid (EC) and internal carotid (IC) arteries; fourth (IV) and sixth (VI) pharyngeal arches; distal pulmonary arterial segments (PA); dorsal aortas (DA); seventh intersegmental arteries (VII); proximal (p) sixth arches; distal (d) sixth arches. Mature anatomy (right) of a double aortic arch with a dominant right arch and patent minor left arch. In most patients, a single left-sided ductus arteriosus or ligamentum arteriosum is present. Left pulmonary artery (LPA); ductus arteriosus (PDA); right pulmonary artery (RPA); subclavian artery (SCA).
Transverse MRI images in a patient with double aortic arch. Both arches are patent; the right arch is dominant. Images A-F are arranged in a caudad to cephalad order. (A) Transverse image at the level of the pulmonary valve. The ascending aorta (AAo) and descending aorta (DAo), cephalad to the junction of the left and right arches, can be seen. (B) At the level of the pulmonary artery (PA) bifurcation, the distal confluence of the left and right arches forming the single descending aorta is depicted. (C) The distal portions of the left (L) and right (R) arches can be seen posterior and to the left and right sides of the trachea. Note the anteroposterior compression of the tracheal carina (anterior to and between the arches). (D) Moving cephalad, the dominance of the right arch can be seen. (E) At the level of the proximal/transverse aortic arches, the origin of the left and right arches from the rightward ascending aorta can be seen. (F) The left and right common carotid and subclavian arteries arise from the left and right arches, respectively. The common carotid arteries are the dark round structures anterior to and to either side of the trachea. The subclavian arteries are the dark round structures posterior to and to either side of the trachea.
Coronal spin-echo MRI images in a patient with a double aortic arch. Both arches are patent, with the right (R) slightly larger in caliber than the left (L). Compression of the trachea (T) between the 2 arches can be seen (left). The confluence of the arches and the descending aorta (D) are shown (right).
 
 
 
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