Figure 8: The course of the balloon catheter (BALL CATH) in a neonate with aortic stenosis is shown; the catheter traversed from the umbilical venous (UV) sheath to the right (RA) and left (LA) atrium, left ventricle (LV), ascending aorta (AAo) and descending aorta (DAo) – see the text for details. The endotracheal (ET) and nasogastric (NG) tubes are marked.