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Coarctation of the Aorta Strategies for Improving Outcomes

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Coarctation of the Aorta Strategies for Improving Outcomes Coarctation of the Aorta Strategies for Improving Outcomes Lan Nguyen, MDa, Stephen C. Cook, MDb,* KEYWORDS Congenital heart disease Aortic coarctation Bicuspid aortic valve Cardiac surgery Stent Aneurysm Aorta Treatment outcome KEY POINTS Coarctation of the aorta is defined by a discrete narrowing of the aorta. Transcatheter systolic coarctation gradient 20 mm Hg is an indication for intervention with treat- ment choice guided by patient age and anatomy of obstruction. Follow-up imaging should be tailored to early identification of recoarctation/aneurysm with directed intervention. Hypertension is common in the aging patient with coarctation despite successful repair. Lifelong routine evaluation by cardiology specialists with expertise in adult congenital heart disease is required to identify late-onset complications. INTRODUCTION patients continue to require lifelong follow-up for management of associated problems including Coarctation of the aorta (CoA) is a common arterial hypertension, atherosclerotic disease, re- congenital heart defect (CHD) found in approxi- coarctation, and aneurysm formation. mately 1 per 2900 live births1–3 and is the seventh 4 most common type of CHD. Still, this is likely an CAUSE AND PATHOGENESIS OF underestimate, because the diagnosis may be de- COARCTATION layed, even in the pediatric population.4,5 In simple terms, coarctation is characterized by discrete Histologic examination of localized aortic coarcta- narrowing of the thoracic aorta adjacent to the lig- tion lesions has demonstrated the presence of a amentum arteriosum. Importantly, discrete coarc- tissue ridge extending from the posterior aortic tation is an aortopathy that lies within a spectrum wall and protruding into aortic lumen. This ridge of arch abnormalities ranging from discrete nar- consists of ductal tissue with in-folding of the rowing to a long segment of arch hypoplasia. aortic media.6 In older patients, aortic intimal pro- The prognosis of untreated coarctation was liferation also contributes to the narrowing at the extremely poor during the presurgical era with me- site of coarctation.7 The cause of discrete aortic dian survival age of 31 years and a quarter of pa- coarctation remains unclear, but is likely multifac- tients dying before the age of 20 years.6 Since torial. Prenatal environmental exposures have the first surgical repair of aortic coarctation per- been associated with CoA and other left-sided le- formed in the 1940s, treatment of coarctation sions.8 However, there is a growing body of litera- has dramatically changed. Overall, survival into ture that suggests a genetic basis for development adulthood is now expected. However, these of these lesions. Case series have described The authors have nothing to disclose. a Department of Cardiovascular Medicine, Heart and Vascular Institute, University of Pittsburgh, Scaife Hall S560.1, 200 Lothrop Street, Pittsburgh, PA 15213, USA; b Department of Pediatrics, The Adult Congenital Heart Disease Center, Heart Institute Children’s Hospital of Pittsburgh of UPMC, 4401 Penn Avenue, Pittsburgh, PA 15224, USA * Corresponding author. E-mail address: [email protected] Cardiol Clin - (2015) -–- http://dx.doi.org/10.1016/j.ccl.2015.07.011 0733-8651/15/$ – see front matter Ó 2015 Elsevier Inc. All rights reserved. cardiology.theclinics.com 2 Nguyen & Cook clustering of coarctation cases in families. Evalua- Turner syndrome has a strong association with tion of families with an index case of left ventricular CoA. In a study of 132 girls diagnosed with aortic outflow tract abnormalities of aortic valve stenosis, coarctation who subsequently underwent karyo- CoA, or hypoplastic left heart syndrome suggest a typing, Turner syndrome was diagnosed in strong genetic influence, with an estimated sibling 5.3%.20 CoA is found in 18% of patients with recurrence risk of greater than 30-fold.9 Recently, Turner syndrome.21 Williams syndrome, a congen- mutations in the NOTCH1 gene have been identi- ital and multisystem genetic disorder, has been fied in individuals with left ventricular outflow associated with supravalvular aortic stenosis. tract malformation, including coarctation.10 In Aortic arch abnormalities, including coarctation, particular, the NOTCH1 variant R1279H seems to are present in 10% of patients with Williams syn- be more common in individuals with aortic coarc- drome.22 Coarctation can also be present in tation.11 NOTCH1 mutations have also been congenital cardiovascular anomalies involving shown to contribute to abnormal epithelial-to- multiple left-sided lesions, including Shone syn- mesenchymal transition in endothelial cells, which drome and hypoplastic left heart syndrome. is an important step in the development of the left ventricular outflow tract. Mechanical models NONCARDIAC ASSOCIATIONS have suggested that abnormalities of blood flow, defective endothelial cell migration, and The link between intracranial aneurysms and CoA excessive deposition of aortic duct tissue at was described well before the surgical era, ac- the aortic isthmus can result in coarctation. counting for 5% deaths in patients with aortic Furthermore, embryonic studies in zebrafish have coarctation on autopsy review.23 In the modern highlighted the importance of intracardiac hemo- era, with the availability of brain MRI the reported dynamics in epigenetic control of distal chamber prevalence of intracranial aneurysms in patients development.12 with CoA is approximately 10%,24 which is five times more common than the average population ASSOCIATED CONGENITAL HEART LESIONS (Fig. 1). In one study, hypertension was more com- mon in the population of coarctation patients with Although CoA can be an isolated CHD, it is also commonly found in other congenital syndromes and cardiovascular anomalies. Thus, deliberate investigation for the presence of coarctation should be made in these patients. The most com- mon cardiovascular malformation associated with CoA is bicuspid aortic valve (BAV). Prior autopsy examination showed 46% of patients with CoA have congenital BAV.13 More modern studies in patients with repaired coarctation found similar re- sults with up to 45% to 62% prevalence of BAV.14–16 The coincidence of BAV and CoA is diffi- cult to determine, because BAV is very common and not everyone is screened for the presence of coarctation. In a study of 102 patients with BAV diagnosed by computed tomography (CT) imag- ing, 22% of patients either had prior coarctation repair, or were found to have CoA.17 The coexis- tence of BAV and coarctation is important to consider, because it places the patient at a higher risk of aortic complications.18 In a study following 341 patients with BAV over a median of 7 years, patients with bicuspid valve in the presence of Fig. 1. Computed tomography angiography of the coarctation had 7.5 times increased risk of head showing normal anatomy of the circle of Willis without cerebral artery aneurysm in a 36 year old ascending aortic complications, most commonly 19 with coarctation of the aorta. Given that hyperten- dilation of the ascending aorta. The same group sion may play a role in the growth of intracranial also found that among patients with aortic coarc- aneurysm, these patients should be monitored and tation, the presence of a BAV was an independent treated if indicated. ACA, anterior cerebral artery; risk factor for the development of aortic wall basilar A, basilar artery; PCoA, posterior communi- complications.16 cating artery. Coarctation of the Aorta 3 intracranial aneurysms.24 Most of the aneurysms pressure differences may not be detected between described are small, and therefore have a low ipsilateral arm and legs.25 Therefore, complete risk of spontaneous rupture. Currently the benefits evaluation should involve measurement of blood of routine screening for intracranial aneurysms in pressure in all four extremities. coarctation remain unclear. DIAGNOSTIC EVALUATION CLINICAL PRESENTATION The electrocardiogram of a patient with coarcta- The clinical presentation of coarctation differs tion may be normal or demonstrate evidence of significantly in pediatric patients in comparison left ventricular hypertrophy from chronic left ven- with adults. Although infants with severe coarcta- tricular pressure overload. On chest radiograph, tion may present with signs and symptoms of a “figure of three” sign formed by the aortic nob, heart failure and cardiogenic shock as the ductus the stenotic segment, and the dilated poststenotic closes, most adults with unrepaired coarctation segment of the aorta suggests CoA. The heart are generally asymptomatic. A common presenta- border can be normal or mildly enlarged. Inferior tion of coarctation is systemic arterial hyperten- rib notching can also be seen in the third to eighth sion. In young adults presenting with severe ribs bilaterally caused by the presence of dilated upper extremity hypertension, coarctation should intercostal collateral arteries. be excluded. Patients presenting with severe hy- Among the noninvasive modalities to evaluate pertension may experience symptoms including CoA, transthoracic echocardiography is the most angina, headache, epistaxis, and heart failure. accessible for the practicing physician. A compre- On physical examination, femoral arterial pulses hensive echocardiogram is recommended in the are diminished and usually delayed. Rarely, claudi- initial evaluation of a patient with repaired or sus- cation may be reported because of lower extremity pected CoA. In addition to
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