Figure 7From: Patent foramen ovale and scuba diving: a practical guide for physicians on when to refer for screeningIntra-cardiac echocardiography. The guidewire and catheter can be seen in the heart, passing from the right atrium (RA), through the patent foramen ovale, into the left atrium (LA). The bright white area (echo dense) on the wall of the LA opposite the RA is the occlude device with the guidewire attached [29].Back to article page