In oro-maxillo-facial surgery, it is a common practice for patients receiving general anesthesia with nasotracheal intubation to widen the surgical field and to ease undergoing surgery. However, a nasotracheal tube blindly passing through the nasal cavity may easily result in nasal cavity and oropharynx damages.~The aim of the study is to investigate use which angulation including 45 degree, 70 degree and 90 degree is appropriate to assist the nasotracheal tube passing the nasal cavity, oropharynx, and advanced into the tracheal. Patients are randomized into three groups by 45 degree, 70 degree and 90 degree to facilitate nasotracheal tube sliding through into trachea and compared with each other group.~Hemodynamic changes in each time interval, each time taken of tube going through the nasal cavity, tube advanced from oropharynx into trachea will be recorded. The incidence of using the video stylet with different angulation to accurately place tube tip into trachea, intubation related side effects and complications are recorded at postoperative time stages.
Uses the video stylet with different angulation to assist the nasotracheal tube passing the nasal cavity, oropharynx and advanced into the trachea.