What are the risks of placenta previa?

The main risks associated with placenta previa include the following: 1. Postpartum hemorrhage: Placenta previa may lead to postpartum bleeding because the lower uterine segment has thinner muscular tissue and weaker contractility. After placental separation, the open blood sinuses are less likely to constrict and close properly, thereby increasing the risk of bleeding. 2. Placenta accreta: Placenta previa is occasionally complicated by placenta accreta, in which placental villi invade the myometrium, resulting in incomplete placental separation and potentially causing severe hemorrhage. 3. Puerperal infection: The placental separation site in placenta previa is close to the external cervical os, making it easier for bacteria to enter. Additionally, due to repeated bleeding, the mother may be physically weakened, increasing susceptibility to puerperal infection. 4. Preterm birth and perinatal mortality: Bleeding from placenta previa commonly occurs in late pregnancy and may trigger preterm delivery. Preterm infants have a relatively higher mortality rate. Furthermore, perinatal mortality rates are also elevated in cases of placenta previa, possibly related to factors such as preterm birth, low birth weight, and fetal abnormalities.