The left-behind metallic nozzle is indeed identified within the chest, superimposed over the heart shadow and left pulmonary hilar region, several centimeters above the level of the prosthetic mitral valve. The surgical team actually had to place another nozzle over the chest wall to act as a reference to help identify the lost nozzle. Without the reference, it may be quite difficult to identify the lost device among so many other devices and tubes.
Tip of the nasogastric tube is located a few centimeters above the level of the diaphragm. A Swan-Ganz catheter is placed to measure intra-atrial pressure as well as for infusions.