Portal venous gas (PVG) is an imaging sign of abnormal accumulation of gas in the portal vein and its intrahepatic portal branches due to various causes and is usually diagnosed by abdominal radiographs. The cause of necrotizing small bowel colitis has not been fully elucidated, but it is generally believed to be due to a combination of causes, of which premature birth and infection are the most important. So, what are the preventive treatments for portal pneumomediastinum? The following are the preventive treatments for portal pneumonia: 1. Fasting Fasting for 3 days in suspected children and 7-10 days in confirmed cases. In severe cases, 14 days or longer. When the clinical condition improves, the abdominal distension disappears and the fecal occult blood turns negative, the diet can be gradually resumed. Resumption of feeding should start with water, then sugar water, diluted milk, and gradually increase the concentration of diluted milk according to the condition. 2.Gastrointestinal decompression During fasting, gastrointestinal decompression is required. 3.Supportive therapy and other treatment During fasting, maintain energy and water-electrolyte balance with intravenous nutrition, supply 209kJ (50kcal/kg) daily, gradually increase to 418-503KJ (100-120kcal/kg), fluid volume 120-150ml/hg, with coagulation. 150ml/hg, fresh frozen plasma can be transfused if there is coagulation mechanism disorder, and anti-shock treatment is given when shock occurs. 4.Surgical treatment Surgery can be considered in case of obvious peritonitis, and intestinal perforation should be treated by surgery immediately. 5, anti-infection ① antibiotic selection: according to the bacterial culture and drug sensitivity test, when the bacteria is unknown, available ampicillin, oxypiperazine penicillin or third-generation cephalosporins, such as anaerobic bacteria preferred metronidazole. ②Course of treatment: 3 days for suspected children, 7-10 days for confirmed cases, 14 days or longer for severe cases. Safety tips 1. Fasting time: once diagnosed, fasting should be immediate, 5-10 days for mild cases, 10-15 days or longer for severe cases. Give gastrointestinal decompression when abdominal distension is obvious. 2. Criteria for resuming feeding: abdominal distension disappears, fecal occult blood turns negative, abdominal X-ray is normal, and general condition improves significantly. If the child has symptoms such as abdominal distension and vomiting again after feeding, it is necessary to fast again. 3.Feeding food: When starting to feed, first try to feed 3-5ml of 5% sugar water, after 2-3 times if there is no vomiting and abdominal distension, you can change to feed diluted milk, starting from 3-5ml each time, gradually increase the amount, each time increase 1 to 2ml, to breast milk is best, do not use hypertonic milk.