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The objective of this study was to analyze echocardiographic characteristics of Pulmonary Artery Sling (LPAS) and to explore the diagnostic value of transthoracic echocardiography.
The echocardiographic characteristics of 7 patients with LPAS from 2012 to 2016 were analyzed retrospectively, and compared with computed tomography angiography (CTA) and angiographic reconstructions.
Seven cases included 2 fetuses and 5 children (aged 6 months to 13 months). The 5 children with LPAS were all associated with different types of congenital cardiac defects, such as atrial septal defect, ventricular septal defects, left superior vena cava, patent ductus arteriosus, and so on. And the two fetuses with LPAS didn’t find any congenital cardiac defects temporarily. Seven cases included 1 partial left pulmonary artery sling and 6 whole left pulmonary artery sling. Echocardiography showed an anomalous origin of the whole left pulmonary artery from the right pulmonary artery in 6 cases, and an anomalous origin of the lower left pulmonary artery from the right pulmonary artery in 1 case. The morphological and hemodynamic changes were also evaluated. In the 7 patients, 1 case was misdiagnosed, and the others were correctly diagnosed. The diagnosis of LPAS was confirmed by CTA and intraoperative findings in the 5 children.
Echocardiography is effective in diagnosing LPAS, when the main pulmonary artery extends to the right pulmonary artery directly with the main pulmonary artery bifurcation disappeared and left pulmonary artery aroused from the right pulmonary artery.