Fi uax 1. Apical four-chamber views from preoperative two-dimensional echocardiogram showing dropout of interventriculan/septal echoes (left panel). Peripheral venous D5W injection (middle panel) at first opacifles only right atrium and ventricle, with no right-to-left shunt and possible left-to-right shunt as indicated by negative contrast effect in the right ventricle. With a premature beat, ...
