incision of trachea ratio: the group of nasal trachea cannula . %, the group of oral trachea cannula 7.0%(P<0.0);
incision of trachea ratio: the group of nasal trachea cannula . %, the group of oral trachea cannula 7.0%(P<0.0);
气管切开率:经鼻插管组. %,经口插管组7.0%(P<0.0);