Figure 2From: Acute right to left shunt through patent foramen ovale presenting as hypoxemia after myocardial infarction: a case report(a) Transesophageal echocardiography showing a large atrial septal defect (ASD) between the left atrium (LA) and right atrium (RA). (b) Following intravenous injection of agitated saline, contrast is seen crossing the ASD into the left side.Back to article page