After 20 weeks of gestation or during labor, partial or total abruption of the normally positioned placenta from the uterine wall before delivery of the fetus is called placental abruption. The causes are related to vascular lesions, sudden drop of pressure in the uterine cavity, direct impact on the abdomen or rough external inversion to correct fetal position, etc. Generally, the diagnosis can be made clearly based on medical history, symptoms, signs and auxiliary examination. 1. Judgment of placental abruption 1. Judgment according to medical history If a pregnant woman is complicated with severe hyperemesis, chronic hypertension and chronic kidney disease, or has a history of direct abdominal impact, the probability of placental abruption will increase; under normal circumstances, placental abruption rarely occurs. (1) Symptoms Light placental abruption mainly has more vaginal bleeding without abdominal pain or with mild abdominal pain; severe placental abruption mainly has sudden and continuous abdominal pain, back pain and low back pain, and in severe cases, signs of shock such as nausea, vomiting, sweating and pallor may appear. (2) Physical signs Mild placental abruption signs are mostly not obvious, uterus is soft, pressure pain is not obvious or only mild limited pressure pain, need to observe the change of fundal height to make clear diagnosis; severe placental abruption examination uterus is hard like plate, pressure pain, fetal position is unclear. 3. Judgment according to auxiliary examination (1) ultrasound examination: ultrasound sonogram shows liquid dark area with unclear edge between placenta and uterine wall, that is, placenta, when hematoma and clot are mechanized, the dark area can be seen as light point reflection; (2) laboratory examination: heavy placental abruption may occur with DIC and coagulation dysfunction, or acute renal failure, abnormalities of routine blood and urine in those who have the above symptoms are mostly suggestive of The abnormalities of blood and urine routine in those who have the above mentioned symptoms are more suggestive of severe placental abruption. The treatment of placental abruption 1, symptomatic treatment: once the diagnosis of placental abruption, should be immediately oxygen, bedside cardiac monitoring, take the left side of the bed, shock patients take the shock position, quickly establish two intravenous channels, timely correction of shock; 2, surgical treatment: cesarean section is suitable for heavy placental abruption, especially for primiparous women who can not end the delivery in a short time. If postpartum hemorrhage occurs, contractions are weak and bleeding is heavy and uncontrollable, hysterectomy should be performed along with blood transfusion.