Placental abruption may be caused by gestational hypertension, vascular factors, mechanical trauma, pressure changes in the uterine cavity, etc. In addition, placenta previa occurs in women of advanced maternal age, intrauterine infections during pregnancy, and people with bad habits such as smoking and alcoholism.
1. Hypertension during pregnancy: patients with hypertension during pregnancy can be separated from the wall of the uterus due to spasm of small uterine arteries, which causes capillary degeneration, necrosis and even rupture and bleeding, and the blood forms a hematoma between the uterus and the placenta, which can separate the placenta from the wall of the uterus.
2. Vascular factors: in the middle and late stages of pregnancy, the uterus can compress the inferior vena cava, resulting in bruising, elevated uterine venous pressure, which can lead to rupture of the blood vessels between the placenta and the uterus, bruising, formation of hematoma, and detachment of the placenta from the wall of the uterus.
3. Mechanical trauma: trauma to the abdomen may also induce separation of the placenta from the uterine wall.
4. Intrauterine pressure changes: premature rupture of membranes before full term can lead to a sudden decrease in intrauterine pressure, causing the uterus to contract suddenly, resulting in misalignment of the placenta with the uterine wall and subsequent detachment.
In addition to the above factors, other diseases may also lead to placental abruption. If you are diagnosed with placenta previa, please follow your doctor’s instructions for treatment.