Anterior placenta is a placenta that is attached to the lower part of the uterus and partially or completely covers the inner cervical opening. The anterior placenta is not placenta praevia. Many mothers-to-be are worried about placenta praevia when they see “anterior placenta” on the ultrasound sheet. Before 28 weeks of gestation, the placenta is low and sometimes accompanied by vaginal bleeding, which is called “low placenta”, and after 28 weeks it is called “placenta praevia”. Its typical symptom is “painless vaginal bleeding”. It can appear at the earliest around 12 weeks of pregnancy, after the bladder is full (i.e. after holding urine), and the distance between the lower edge of the placenta and the endocervix is observed by ultrasound, and according to the relationship between them, it can be divided into: central (the placenta completely covers the endocervix), partial (the lower edge of the placenta partially covers the endocervix), marginal (the lower edge of the placenta reaches the endocervix), and low placenta (the distance between the lower edge of the placenta and the endocervix is <7cm). 7cm). What should I do if I have a low placenta or placenta praevia? If there is no bleeding, you should review the ultrasound regularly to know if the placenta is rising and far from the endocervix, so that you can decide the delivery method after full term. During the trial of labor, the head of the fetus can press the lower edge of the placenta to avoid bleeding. 2. Look at the type of placenta praevia. Placenta praevia is prone to repeated vaginal bleeding. No matter which type of placenta praevia it is, as long as the bleeding is not too much (estimated bleeding is less than 300ml), according to the gestational week, treat accordingly and expect treatment to promote fetal lung maturation, suppress contractions, symptomatic supportive treatment, prolong the gestational week and improve the survival rate of the newborn. Central placenta praevia usually bleeds heavily, and if there is excessive vaginal bleeding (more than 300ml at one time), an emergency cesarean section is needed to save the mother's life regardless of the gestational week. 3, not full-term placenta vaginal bleeding is not much, according to the preterm labor treatment, before 34 weeks, with dexamethasone 6mg intramuscular injection every 12 hours, a total of 4 times to promote fetal lung maturation, while using contraction inhibitors such as magnesium sulfate, ampoule, Ebao and other drugs to actively prolong the pregnancy to 34 weeks later. 4, the timing and mode of delivery (when to give birth, how to give birth?) Central placenta praevia, in 36 to 37 weeks of pregnancy, admission to the hospital to prepare for cesarean section to avoid hemorrhage. In the case of central placenta praevia, there is a lot of bleeding during the operation, so it is important to prepare blood before the operation, usually 6 units of homogeneous concentrated red blood cells. In case of combined placenta implantation, which is also known as a dangerous placenta praevia, you should also be prepared for hysterectomy. There is a new technique, namely abdominal aortic balloon block, in which a small balloon is placed in the lower part of the abdominal aorta via femoral artery puncture before the cesarean section with the help of an interventional surgeon, and the baby is removed and the balloon is filled to temporarily block the uterine artery to reduce intraoperative bleeding and gain time to detach the placenta and preserve the uterus as much as possible.