endrocheal suctioning;incracranial hypertension;cerebral oxygenation metabolism;jugular oxygen saturation;Open endrocheal suctioning; Closed endrocheal suctioning; hyperventilation.

• 01气管内吸引术;颅内高压;脑氧代谢;颈静脉氧饱和度;开放式气管内吸引术;闭合式气管内吸引术;过度通气