Yang Ping felt it was nothing unusual; not only could a nasogastric tube accidentally be inserted into the skull, but it could also end up in the heart—it's rare, but not impossible. To educate the nurses to strictly follow procedural protocols, Head Nurse Cai once taught a class about "The Misplaced Gastric and Urinary Catheters." Since there was nothing much to see in the ongoing surgery, as Director Gao was very familiar with the procedure, Yang Ping decided to check out the Neurosurgery department.