In order to clearly see the mucous membrane of the digestive tract, it is necessary to make the examined area very clean, i.e., there is no food or blood clot remaining. If you are having a gastroscopy in the morning, you should not eat or drink anything after 8 p.m. on the night before the examination, and you are not allowed to smoke. Eat a small amount of easily digestible food for dinner the day before. Because the patient even drink a small amount of water, can make the color of the gastric mucosa change, such as in the significant atrophic gastritis of the color of the lesion, drinking water after the gastric mucosa can become red, so that the diagnosis of error. If the afternoon for gastroscopy, you can let the patient can drink some sugar water before 8 o'clock in the morning of that day, but can not eat other things, not eat at noon.
In order to make the insertion of the mirror smoothly, reduce the pharyngeal reaction, to achieve the ideal anesthesia effect, pharyngeal anesthesia time should not be less than 10 minutes, the spray should reach the posterior wall of the pharynx.