1Placenta and umbilical cord factors
Such as placenta previa, abruption, umbilical cord帆状attachment of blood vessels in advance, acute chorioamnionitis, umbilical cord knotting, twisting, prolapse, umbilical cord around the neck.
2Fetal factors
Such as severe fetal malformation, intrauterine growth retardation of the fetus, intrauterine infection of the fetus, genetic disease, incompatibility of maternal and fetal blood types, etc.
3Factors of the pregnant woman
Hypertension, post-term pregnancy, diabetes, chronic nephritis, cardiovascular disease, systemic and abdominal infection, shock caused by various reasons, etc.
4Local factors of the pregnant woman's uterus
Overly large uterine tension or strong contraction, uterine fibroids, uterine malformations, uterine rupture, etc., lead to local ischemia affecting the placenta and fetus.
5Problems in the process of delivery
Fetal distress or fetal asphyxia, etc.
6Environmental issues
Environmental toxins, drugs, etc.