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Comprehensive Textbook of Echocardiography
by Navin C NandaThis video clip depicts two-dimensional transthoracic echocardiography: right parasternal approach, secundum atrial septal defect. Color Doppler examination: the arrowhead shows flow signals moving from the left atrium (LA) into the right atrium (RA) through a secundum atrial septal defect located close to the opening of the superior vena cava (SVC). The parallel orientation of the shunt signals with the Doppler beam resulting from horizontal viewing of the atrial septum in this examination plane facilitates not only the detection of the defect high up in the atrial septum but also an accurate measurement of the shunt velocities and shunt volume. (IVC: Inferior vena cava; LV: Left ventricle; RV: Right ventricle; TV: Tricuspid valve).
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