目的：分析永存动脉干(PTA)结构、血流动力学特征，并探讨切面的选择。
AIM: To analyze structure of persistent truncus arteriosus (PTA), hemodynamics, and explore selection of view.
目的总结儿童永存动脉干外科治疗经验。
Objective To summarize the surgical results of truncus arteriosus in children.
目的探讨永存动脉干的超声显像特征，评价超声心动图在永存动脉干影像诊断中的价值。
Objective To explore the echocardiographic characteristics of persistent truncus arteriosus and evaluate the value of echocardiography in clinical imaging diagnosis.
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