fig20

Figure 20. Selected video frames from subcostal long-axis views of the atrial septum, demonstrating a small color flow jet across the patent foramen ovale (PFO; arrow in A), which was enlarged (arrow in B) after balloon atrial septostomy. The jet width is wider, and the flow is laminar after balloon septostomy. Modified from Ref.^[14]. LA: Left atrium; RA: right atrium.