Measurement and Analysis of Gas Composition in Digestive Tract

The purpose of this study is to detect the concentration of various gases，including hydrogen, methane, hydrogen sulfide, nitric oxide in different parts of the digestive tract by a safe and direct method, and to establish a human digestive tract gas profiles. Analyze the differences in gas components in different segments of the digestive tract in patients with different diseases, and analyze the correlation between specific gases and digestive tract diseases and non-specific symptoms.