In the patients receiving general anesthesia with nasotracheal or orotracheal intubation is common. However, a orotracheal tube blindly passing through the oral cavity and oropharynx may easily result in oral cavity and oropharynx damages.~The advancement of the tube from oropharynx into trachea may assist using the video stylet.~The aim of the study is to investigate use which angulation including 45 degree, 70 degree and 90 degree is appropriate to assist the orotracheal tube passing the oral cavity, oropharynx, and advanced into the trachea.~Patients are randomized into three groups by 45 degree, 70 degree and 90 degree to facilitate orotracheal 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 oral 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 orotracheal tube passing the oral cavity, oropharynx and advanced into the trachea