Through analyzing the causes and nursing of non-planning extubation, The main causes were decannulation themselves, laryngospasm, blocking with sputum, non-aerated capsula or aerated capsula injuring.

• 认为:患儿不合作自行拔管、喉痉挛、痰痂阻塞、无充气套囊或充气套囊破裂是致非计划拔管的主要原因。