Anterior vessels
Vasa praevia is a very rare obstetric disease. It manifests as painless vaginal bleeding in the middle and late stages of pregnancy, which is easily misdiagnosed as delaying the treatment of placenta previa or early placental dissection and causing fetal death. The danger of anterior blood vessels is that when the exposed part is lowered, it can directly compress the blood vessels, causing fetal distress, but more dangerous is that the anterior blood vessels fixed by collagen fibers to the fetal membrane can be damaged by natural or artificial rupture of the membrane Injury and bleeding. This kind of bleeding is purely a fetal bleeding, which is harmless to the mother, but it is extremely dangerous to the fetus.
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