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Figure 2 Intracardiac ultrasound images demonstrating the localization of the crista terminalis (CT) as well as an adequate (A) and an inadequate (B) position of the crista terminalis mapping catheter (Map) during a typical investigation. Images were obtained at the mid-right atrium inferior to the entrance of the right atrial appendage. Orientation of the images is labeled on top. IAS = interatrial septum; ICE = artifact of the intracardiac ultrasound catheter.