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Figure 3 (A) Transesophageal real-time 3-dimensional echocardiography depiction of an Amplatz occluder after opening of the first disc. (B) Amplatz occluder after opening of both discs. (C) Three-dimensional reconstruction of the model of an atrial septum defect. (D) Three-dimensional image after closure of the defect with the Amplatz occluder.