PMC5761508_01
Intracardiac echocardiography using the Ultra ICE Boston Scientific ultrasound system. 1A. Intracardiac echocardiographic imaging from inside the left atrial appendage. The ICE catheter in the middle of the image. The transducer images in a plane radial to the tip. The 360  acoustic arc of the ultrasound catheter produces a cross-sectional image of the LAA. The measured area of LAA is 3.82 cm2. Contractions of the appendage are clearly displayed in the lower part of the Figure 1A with the help of yellow arrows. 1B. Intracardiac echocardiographic imagind during transseptal puncture. The transseptal needle is inside the right atrium, tenting the fossa ovalis and pushing it into the left atrium. White arrow: BRK transseptal needle against the interatrial septum. Yellow arrow: ICE catheter in the middle of the image. LA, left atrium; RA, right atrium.
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The contractility of LAA was also assessed using multiple frames recorded on videotape (Figure 1).