How many weeks does placenta accreta usually occur?

Placenta accreta usually occurs in the early stages of pregnancy. It is a very serious symptom. If you don't pay attention, it will cause heavy bleeding, postpartum infection, or even death in pregnant women. For pregnant women with more critical conditions, surgical resection must be performed and the pregnancy needs to be terminated. Only patients with relatively mild conditions can wait until full term for a cesarean section, but conservative treatment must also be adopted.

Placenta accreta refers to the penetration of the placental villi into part of the uterine wall myometrium, which occurs in early pregnancy. Placenta accreta is one of the serious obstetric complications, which can lead to maternal hemorrhage, shock, uterine perforation, secondary infection, and even death. Multiparity, artificial abortion, induced labor, cesarean section, puerperal infection, history of hysterotomy, history of pelvic radiotherapy, placenta previa, and advanced age are considered to be high-risk factors for placenta accreta. For pregnant women with high-risk factors, prenatal color Doppler ultrasound screening for placenta accreta is necessary. Placenta accreta is one of the serious complications of pregnancy and is difficult to diagnose. Hysterectomy in patients with placenta accreta has become the number one reason for peripartum hysterectomy.

Placenta accreta is a serious condition. Hysterectomy is required due to heavy bleeding, severe infection in the uterine cavity during conservative treatment, or other reasons that seriously threaten the mother's life. However, conservative treatment is also an effective method for those women who do not bleed too much, have no signs of infection during conservative treatment, have stable vital signs, have a small area of ​​​​implantation, and wish to retain the uterus.

1. Placenta accreta

It is caused by the direct attachment of the villi to the myometrium of the uterus. There are two types of placenta adhesion: complete and partial. This type of placenta may be partially detached on its own, but part of it will remain in the uterine cavity and need to be manually detached. The operation is more difficult, but part of the muscle tissue can be involved. When the excised placenta is sent for pathology, it is often difficult to determine whether there is a lack of decidua basalis either with the naked eye or under a microscope. For example, in hysterectomy specimens, samples are taken from multiple locations of the placenta and the adherent uterine wall to reveal decidua defects and direct contact of the villi with the uterine myometrium.

2. Placenta accreta

The villi invade part of the uterine myometrium, and the implanted part cannot be peeled off by itself, and the uterine myometrium will be damaged during artificial peeling. Pathological examination under a microscope shows that the villi have invaded the myometrium.

3. Placenta percreta

The villi invade the myometrium and penetrate the uterine muscle wall to reach the serosa, often causing uterine rupture.