With the continuous improvement of gastrointestinal endoscopy instruments and equipment and the increasing improvement of gastrointestinal endoscopy operation techniques, gastrointestinal examination has become the first choice for gastrointestinal diseases and is accepted by the majority of patients. Painless gastroscopy is a popular gastroscopy method, which means that anesthesiologists use a new type of anesthetic drug, which is injected intravenously to make the patient perform the examination in a short sleep state, which can obviously reduce the patient’s pain and ensure the smooth examination. All patients undergoing painless gastroscopy should have an electrocardiogram before the examination to assess their heart condition.