Clinical medicine: what is the double contrast X-ray examination of gas and barium?

Air-barium double contrast radiography, referred to as air-barium enema. Because the density of large intestine is connected with surrounding tissues in normal state, X-ray can't show it. Only by injecting gas, barium and other contrast agents into the intestine can the contour and mucosal surface condition be displayed. Barium enema examination is a medical examination that barium and gas are injected into rectum and colon from anus, and the shape of large intestine, the surface condition of mucosa and whether there are tumors and polyps are observed under X-ray. Doctors can find lesions from rectum to the end of ileum through barium enema examination, especially colorectal tumors, constipation and colitis. The diagnosis of colorectal diseases is of great significance. Compared with colonoscopy, this kind of intestinal preparation before examination is simpler and the pain during examination is relatively less, which is easy for patients to accept. When doing barium enema, the doctor will insert an anal catheter in the ampulla of rectum, and then inject barium into it first. During the examination, the patient will feel abdominal distension and defecation. At this time, the patient should try to hold back and avoid barium outflow. At the same time, during the examination, the doctor will let the patient turn over from time to time to make the gas and barium flow, so that the surface of the intestinal cavity is in sharp contrast with the gas in the intestinal cavity coated with a thin layer of barium. At this time, the patient needs to turn over and adjust his position according to the doctor's advice, so as to take a clear and satisfactory X-ray to help the diagnosis.