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Vol. 40. Núm. 8.
Páginas 623-624 (agosto 2021)
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Vol. 40. Núm. 8.
Páginas 623-624 (agosto 2021)
Image in Cardiology
Open Access
Left-to-right extracardiac shunt: A wake-up call
Shunt esquerdo-direito extra cardíaco: uma chamada de alerta
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João Antunes Sarmentoa,
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joaoantunessarmento@gmail.com

Corresponding author.
, Marta João Silvab, António J. Madureirac, Jorge Casanovad, Jorge Moreiraa
a Department of Pediatric Cardiology, Centro Hospitalar Universitário São João, Porto, Portugal
b Pediatric Intensive Care Unit, Centro Hospitalar Universitário São João, Porto, Portugal
c Department of Radiology, Centro Hospitalar Universitário São João, Porto, Portugal
d Department of Cardiothoracic Surgery, Centro Hospitalar Universitário São João, Porto, Portugal
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We report the case of a four-month-old infant with Down's syndrome referred for observation due to progressive tachypnea and failure to thrive. Chest radiography revealed cardiomegaly and pulmonary congestion (Figure 1). Transthoracic echocardiography showed severely dilated left-sided chambers with global systolic dysfunction, but was inconclusive regarding the underlying abnormality due to the patient's poor acoustic window (Figure 2). On cardiac catheterization, the child was found to have a 10 mm long, 3.8 mm wide patent ductus arteriosus, anatomically unsuitable for percutaneous closure, and a hypoplastic left coronary artery (Figure 3). The patient underwent an uneventful surgical ligation of the ductus via lateral thoracotomy and was discharged after six days. One month later, the child was admitted to the pediatric ICU with respiratory failure requiring mechanical ventilation. Transthoracic echocardiography revealed a severely dilated left ventricle with dyskinesia of the posterior and lateral walls. Due to lack of clinical improvement, a cardiac computed tomography was performed, revealing a large type I aortopulmonary window (10 mm×10 mm) between the right aspect of the distal pulmonary trunk and the left aspect of the ascending aorta (Figure 4). After surgical closure with an aortic cuff, the patient presented gradual clinical recovery until discharge with residual systolic dysfunction and tachypnea. Through careful analysis, the aortopulmonary window was found to be already visible on the catheterization cines, but was probably overlooked due to the concomitant ductus. The authors wish to highlight that, even in the presence of a common congenital heart defect, additional abnormalities must always be carefully excluded.

Figure 1.

Chest radiography showing cardiomegaly and pulmonary congestion.

(0.05MB).
Figure 2.

Transthoracic echocardiography (4-chamber view), with severe dilatation of the left atrium and left ventricle. LA: left atrium; LV: left ventricle; RA: right atrium; RV: right ventricle.

(0.07MB).
Figure 3.

Cardiac catheterization: (A) anteroposterior view: aortography revealed normal origin of the coronary arteries with a hypoplastic left coronary artery (arrow), and clear presence of an extracardiac left-to-right shunt, which was later found to be mostly due to the presence of an aortopulmonary window (*); (B) lateral view: selective aortic angiography showed the presence of a patent ductus arteriosus (arrow), which was deemed unsuitable for percutaneous closure.

(0.04MB).
Figure 4.

Computed tomography. Axial (A) and coronal (B) views, in which a large (10 mm×10 mm) aortopulmonary window is evident (*). The left ventricle is severely dilated. Ao: ascending aorta; P: main pulmonary artery; LV: left ventricle.

(0.05MB).
Conflicts of interest

The authors have no conflicts of interest to declare.

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