American society of echocardiography has described several views for trans esophageal echocardiography, obtained from upper and mid esophagus and stomach.
Color Doppler echocardiogram in LV - RA shunt with video with narration, still pictures and description. LV-RA shunt could be any one of the three mechanisms.
Patent foramen ovale vs small ASD: Echocardiogram from subcostal view showing the interatrial septum with a small defect and left to right flow across.