![]() ![]() Multiple fetuses – carrying twins, triplets, quads or more increases the risk of placental abruption compared to carrying a single fetus.Prior pregnancy – the risk increases the more pregnancies a woman has had.Advanced maternal age – older mothers are at increased risk of a range of pregnancy complications, including placental abruption.While the exact cause in most cases is unknown, certain factors make a pregnancy more susceptible to placental abruption. Possible causes of uterine decompression include the birth of the first twin (or multiple) or rupture of amniotic membranes when there is excessive amniotic fluid. Uterine decompression – this is a sudden loss of amniotic fluid from the uterus, which can suck the placenta from the uterus wall.Examples of events that may cause this type of injury could include a car accident, assault or fall. ![]() Abdominal trauma – an injury to the pregnant woman’s abdomen may tear the placenta from the wall of the uterus.Some of the known causes of placental abruption include: It is thought that an abnormal blood supply in the uterus or placenta may play a role, but the cause of the suspected abnormality isn’t clear. In most cases, doctors don’t know the exact cause or causes of placental abruption. This is known as a ‘retroplacental clot’. ![]() In some cases, bleeding may occur but the blood may clot between the placenta and the wall of the uterus, so vaginal bleeding may be scanty or even non-existent.
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