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Transesophageal echocardiography midesophageal short-axis view with agitated saline injection in the upright sitting position. Transesophageal echocardiography with agitated saline injection demonstrated many bubbles (yellow arrowheads) entering the LA via the ASD. Platypnea-orthodeoxia syndrome due to the small ASD was diagnosed (Video 7). LA, Left atrium.
