The aim of our study was to develop an automatic quality-control system and assess the performance of this system in quality control of esophagogastroduodenoscopy.

In this study, the researchers firstly developed an automatic quality-control system, name as EAS. Next, the researchers applied the system in a endoscopic center and designed a prospective randomised controlled trial to investigate the performance of the system in quality control of esophagogastroduodenoscopy.

Inclusion Criteria:

• patients undergoing EGD examination with anaesthesia;
• patients able to give informed consent.

Exclusion Criteria:

• patients with the contraindications to EGD examination;
• patients with a prior EGD examination within 1 year before the trial;
• patients with frankly upper gastrointestinal malignant lesions that were apparent on endoscopy;
• a history of upper gastrointestinal cancers;
• allergic to anaesthetic in previous medical history;
• patients refused to participate in the trial;
• the EGD procedure cannot be completed due to stenosis, obstruction, solid food, or complications of anaesthesia.