It is best not to eat or drink before doing the electronic laryngoscopy, so as not to cause vomiting, so that vomit into the trachea, resulting in patients choking and other phenomena, do about 10 minutes before the patient’s oropharynx and nasal cavity sprayed with lidocaine to play the role of surface anesthesia, nasal cavity sprayed with ephedrine to play the role of contraction of the nasal cavity, so that the nasal cavity becomes wide, easy to insert the laryngoscope. Generally do electronic laryngoscope from the nasal cavity inserted can observe the nasal cavity, nasopharynx and throat, if the nasal cavity is narrower can not be inserted, can be inserted from the mouth, because the nasal cavity and oropharynx are sprayed with anesthetic, generally do electronic laryngoscope is not very uncomfortable.