Images of transesophageal echocardiography. (A) Needle insertion is difficult to visualize in the ascending aorta. (B,C,D) Guide wire (arrows) in the true lumen. (B) Short axis of descending thoracic aorta. (C) Long axis of descending thoracic aorta. (D) Distal aortic arch. (E) Cannula tip (arrow) in the distal aortic arch. (F) Color Doppler flow through the cannula forms a U-turn shape. Arrow indicates direction of perfusion through the cannula.