Placental abruption is a gestational complication that usually occurs in the third trimester of pregnancy. There are different grades depending on the severity of placental abruption, although grade 1 placental abruption is the most common.
In addition, placental abruption can be partial or total. In the first case, the placenta only separates from part of the uterine wall. Total placental abruption, on the other hand, means that the placenta separates from the entire wall of the uterus.
In either case, the remaining space fills with blood and may cause bleeding or remain there.