Hemodynamic obstruction: The passage of intestinal contents is obstructed, and the intestinal canal is free of hemodynamic obstruction. It is one of the common acute abdominal diseases in surgery. It is one of the common surgical emergencies. It is often clinically classified into mechanical intestinal obstruction, dynamic intestinal obstruction and hemodynamic intestinal obstruction according to its cause. Causes: Blood flow of the intestinal wall is impaired by mesenteric vascular embolism or thrombosis, followed by intestinal paralysis, resulting in necrosis of intestinal strangulation and failure of normal operation of intestinal contents. Clinical symptoms: 1. abdominal pain, paroxysmal colic; 2. vomiting, early reflex; late vomiting can be frequent, early vomiting in high obstruction, late vomiting in low; 3. abdominal distension, generally not obvious in high; low or paralytic significant and wide; 4. anal stop defecation exhaust, high or early obstruction can still have exhaust, with strangulation can be mucus blood stool; 5. intestinal pattern and peristaltic waves, intestinal sounds hyperactivity with air over water sound, peritonitis, pressure pain and rebound pain for intestinal strangulation performance. Diagnostic basis: 1. Paroxysmal abdominal colic is a manifestation of early or incomplete obstruction; while persistent abdominal pain with paroxysmal aggravation is an early feature of strangulated obstruction. Severe persistent abdominal pain is the late manifestation of obstruction and shock symptoms may appear; 2, early and frequent vomiting is mostly high obstruction, and vomiting is mostly low obstruction only after the appearance of more obvious abdominal distension; 3, stopping anal venting and defecation; 4, abdominal distension with intestinal pattern, peristaltic wave, hyperintestinal sounds and air over water sound; 5, limited or extensive abdominal pressure and rebound pain or extraction of bloody abdominal fluid is intestinal strangulation or perforation, peritonitis manifestation; 6, abdominal plain film shows obvious dilatation in the abdomen. The abdominal plain film showed obvious dilated intestinal tube and air-fluid surface; 7, obvious or severe systemic dehydration with electrolyte and acid-base balance disorders.