The cause of fetal distress

The cause of fetal distress is multifaceted and can be grouped into three categories.

A、Maternal factors

The lack of maternal blood oxygen content is an important cause of mild hypoxia maternal no obvious symptoms, but will affect the fetus fetus. Maternal factors that result in fetal hypoxia:

(1) minor arterial insufficiency: such as high blood pressure, chronic nephritis, and PIH.

(2) the lack of oxygen-carrying capacity of red blood cells: such as severe anemia, heart disease, heart failure and pulmonary heart disease and so on.

(3) acute blood loss: such as prenatal bleeding disorders and trauma.

(4) uteroplacental blood supply is blocked: radical production or uncoordinated uterine contraction: improper use of oxytocin, causing strong contractions; extend the production process, especially prolonged second stage; excessive expansion of the uterus, polyhydramnios and multiple births pregnancy; premature rupture of membranes, the umbilical cord may be under pressure.

B、Fetal factors

(1) the fetal cardiovascular system dysfunction, such as severe congenital cardiovascular disease, intracranial hemorrhage.

(2) fetal malformations.

C、Umbilical cord, placenta factors

The umbilical cord and placenta of the mother and the fetus between oxygen and nutrients transported delivery channel, and its dysfunction will inevitably affect the fetus can not obtain the necessary oxygen and nutrients.

(1) cord blood transport is blocked

(2) placental dysfunction: If prolonged pregnancy, placental stunting (too small or too large), abnormal placental shape (membranous placenta, contour placenta) and the placenta and infect.