Failure to withdraw a catheter is related primarily to catheter entrapment or knotting. Placement of a Swan-Ganz catheter is associated with various complications, one of which is entrapment. Entrapment of a Swan-Ganz catheter in the heart, vena cava, or pulmonary artery is a very rare and serious complication that may lead to life-threatening complications if not treated appropriately. Most reported cases of catheter entrapment have been associated with surgical sutures, artificial valves, or abnormal cardiac anatomy. Here we report a rare case of Swan-Ganz catheter entrapment resulting from inserting an excessive length of Swan-Ganz catheter into the heart. The catheter was removed smoothly under fluoroscopic guidance.