患者发生急性呼吸衰竭时 ,常需进行机械通气 ,改善呼吸功能 ,为进一步康复创造条件。患者因病情危重需气管插管及机械通气时 ,出现精神紧张、烦躁、焦虑或恐惧等症状 ,为保证气管插管与机械通气顺利进行 ,常用镇静药物减少激越反应 ,以保证机械通气治疗与监测的顺利进行[1] 。 Patients with acute respiratory failure, often require mechanical ventilation, improve respiratory function, to create conditions for further recovery. Patients due to critically ill tracheal intubation and mechanical ventilation, the emergence of mental stress, irritability, anxiety or fear and other symptoms, in order to ensure the smooth progress of endotracheal intubation and mechanical ventilation, sedative drugs commonly used to reduce the more aggressive response to ensure mechanical ventilation and monitoring The smooth progress [1].