Blood leaving the veins is the clinical manifestation of crush syndrome. Crush syndrome is a series of pathological changes in the body caused after a person is crushed by a stone and earth, especially a muscular limb is crushed for more than one hour (e.g. thigh). Due to damage to the skin and flesh, blood leaving the veins and blood stasis, stagnation of qi and blood, and meridian occlusion, there is localized pain, swelling of the limb, indentation and hardening of the skin, subcutaneous stasis of blood, and increased skin tension. What can cause extrusion syndrome? 1, accidents and natural disasters Extrusion syndrome occurs mostly in injuries from accidents such as house collapse, engineering collapse, traffic accidents, etc. It can occur in batches during wartime or in severe natural disasters such as strong earthquakes. 2, position factors In addition, occasionally seen in coma and surgery patients, the limb for a long time by the fixed position of the self-pressure caused by. The position of the patient during surgery should be convenient for operation and tolerated by the patient as a principle. The diagnosis is made based on the patient’s medical history or history of injury, clinical manifestations and laboratory tests. In addition, it should be noted that patients who die within a short time after crush injury are often due to traumatic hemorrhagic shock or hyperkalemia resulting in cardiac arrest, while patients who die after several days are often due to renal failure or multi-organ failure caused by crush injury. Therefore, in the forensic autopsy work, such as a high degree of suspicion that the cause of death is extrusion syndrome, the kidney must be taken for pathological examination and confirmed to prevent misdiagnosis. In patients with crush syndrome, once there is evidence of renal failure, dialysis therapy should be performed early. This therapy can significantly reduce death due to hyperkalemia and other causes of acute renal failure. Hemodialysis (i.e., artificial kidney) can be done in hospitals where available. Peritoneal dialysis is simple to perform and also gives good results for most patients.