Fig 1. (A) Pre-procedural transesophageal echocardiography showing a medium-sized PFO (arrow) based on the extent of right-to-left shunt of agitated colloidal contrast. (B) Transesophageal echocardiography of a patient with a PFO and an atrial septal aneurysm (ASA; excursion of the septum of more than 15mm throughout the cardiorespiratory cycle).
LA = left atrium; RA = right atrium.