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Figure 1 Fluoroscopic position of the intracardiac transducer with corresponding echocardiographic images. (A) Long-axis view of the tricuspid valve (TV), right ventricle (RV), and right ventricular outflow tract viewed from the right atrium (RA). (B) Rotation of the catheter clockwise reveals a long-axis view of atrial septum and the left atrium (LA); color Doppler demonstrates an atrial septal defect. (C) Advancing the transducer cranially with slight posterior flexion reveals the sinus venosus septum, superior vena cava (SVC), and origin of the right upper pulmonary vein (RUPV). (D) Further posterior flexion and rotation of the transducer towards the TV provides a short-axis image of the aorta (Ao), atrial septum, and atrial septal defect.