Delayed gastric emptying (DGE), also known as gastroparesis, is a common complication after pancreaticoduodenectomy, but mostly reported as the first post-pancreaticoduodenectomy complication, and compared with other complications (pancreatic sputum, bleeding, abdominal infection), it is not life-threatening but prolongs the hospital stay and increases medical costs for patients The main symptoms of pancreatic sputum are 1, clinical manifestations and diagnostic criteria The main clinical manifestations: postoperative gastrointestinal decompression amount can not dial the gastric tube, or stop gastrointestinal decompression, into the fluid or from fluid to semi-liquid diet, the patient appears epigastric fullness and discomfort, nausea and vomiting. Pain is not obvious, after eating and vomiting a large amount of gastric contents, which may or may not contain bile, the symptoms are temporarily relieved after vomiting, and a large amount of fluid is withdrawn by gastrointestinal decompression. Physical examination: epigastric fullness, mild pressure pain, audible vibrohydraulic sounds, diminished or normal bowel sounds. 2, the mechanism of occurrence and factors affecting the mechanism of occurrence is still unclear, may be the result of the interaction of various factors such as neural and body fluids. The possible mechanisms and influencing factors are as follows: (1) Surgical trauma: injury to the vagus nerve, intraoperative severing of the intergastric nerve, and elevated plasma catecholamine levels due to surgical stress, which are positively correlated with reduced intestinal motility and delayed gastric emptying. (2) Influence of surgical approach: Ligation of the right gastric vessel may lead to pyloric ischemia and decrease the motor rhythm of the stomach, thus leading to DGE. (3) Pancreatic fibrosis: Pancreatic fibrosis is caused by obstruction of the pancreatic duct. It can form in the pancreas after various factors such as tumors cause obstruction of the proximal pancreatic duct. (4) Role of the duodenal pacing point: contraction of the GI tract is automatic and rhythmic, propagating downward from the stomach along the intestinal canal to form peristalsis, causing a pressure gradient in the GI tract that pushes food downward. After duodenal resection, the rhythmic activity of the stomach disappears and the rhythmic contraction cycle of the small intestine is shortened, while peristalsis slows down. (5) Abdominal infection : Endotoxin produced by postoperative infectious complications (anastomitis, abdominal abscess, incisional infection, intrapulmonary infection, etc.) can cause gastrointestinal motility dysfunction.