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Figure 1: Transesophageal evaluation of PFO. (a) Four-chamber view to evaluate the atrioventricular valves and superior rims. (b) Aortic short-axis view to evaluate the aortic and the posterior rim and (c) Bi-caval view to evaluate the superior vena cava and the inferior vena cava rims. Note that the septum primum (the thin septum) bulges into the left atrium in the four-chamber view

Figure 1: Transesophageal evaluation of PFO. (a) Four-chamber view to evaluate the atrioventricular valves and superior rims. (b) Aortic short-axis view to evaluate the aortic and the posterior rim and (c) Bi-caval view to evaluate the superior vena cava and the inferior vena cava rims. Note that the septum primum (the thin septum) bulges into the left atrium in the four-chamber view